refined error model (#2253)

.cargo/config.toml

@@ -1,7 +1,8 @@
 [alias]
-chk = "hack check --workspace --all-features --tests --examples"
+chk = "check --workspace --all-features --tests --examples --bins"
-lint = "hack --clean-per-run clippy --workspace --tests --examples"
+lint = "clippy --workspace --tests --examples"
 ci-min = "hack check --workspace --no-default-features"
 ci-min-test = "hack check --workspace --no-default-features --tests --examples"
 ci-default = "hack check --workspace"
 ci-full = "check --workspace --bins --examples --tests"
+ci-test = "test --workspace --all-features --no-fail-fast"

CHANGES.md

@@ -13,6 +13,8 @@
 * Update `language-tags` to `0.3`.
 * `ServiceResponse::take_body`. [#2201]
 * `ServiceResponse::map_body` closure receives and returns `B` instead of `ResponseBody<B>` types. [#2201]
+* All error trait bounds in server service builders have changed from `Into<Error>` to `Into<Response<AnyBody>>`. [#2253]
+* All error trait bounds in message body and stream impls changed from `Into<Error>` to `Into<Box<dyn std::error::Error>>`. [#2253]
 * `HttpServer::{listen_rustls(), bind_rustls()}` now honor the ALPN protocols in the configuation parameter. [#2226]
 * `middleware::normalize` now will not try to normalize URIs with no valid path [#2246]
 
@@ -21,6 +23,7 @@
 
 [#2200]: https://github.com/actix/actix-web/pull/2200
 [#2201]: https://github.com/actix/actix-web/pull/2201
+[#2253]: https://github.com/actix/actix-web/pull/2253
 [#2246]: https://github.com/actix/actix-web/pull/2246
 
 

actix-files/Cargo.toml

@@ -18,6 +18,7 @@ path = "src/lib.rs"
 
 [dependencies]
 actix-web = { version = "4.0.0-beta.6", default-features = false }
+actix-http = "3.0.0-beta.6"
 actix-service = "2.0.0"
 actix-utils = "3.0.0"
 

actix-http/CHANGES.md

@@ -13,12 +13,15 @@
 
 ### Changed
 * The `MessageBody` trait now has an associated `Error` type. [#2183]
+* All error trait bounds in server service builders have changed from `Into<Error>` to `Into<Response<AnyBody>>`. [#2253]
+* All error trait bounds in message body and stream impls changed from `Into<Error>` to `Into<Box<dyn std::error::Error>>`. [#2253]
 * Places in `Response` where `ResponseBody<B>` was received or returned now simply use `B`. [#2201]
 * `header` mod is now public. [#2171]
 * `uri` mod is now public. [#2171]
 * Update `language-tags` to `0.3`.
 * Reduce the level from `error` to `debug` for the log line that is emitted when a `500 Internal Server Error` is built using `HttpResponse::from_error`. [#2201]
 * `ResponseBuilder::message_body` now returns a `Result`. [#2201]
+* Remove `Unpin` bound on `ResponseBuilder::streaming`. [#2253]
 * `HttpServer::{listen_rustls(), bind_rustls()}` now honor the ALPN protocols in the configuation parameter. [#2226]
 
 ### Removed
@@ -37,6 +40,7 @@
 [#2201]: https://github.com/actix/actix-web/pull/2201
 [#2205]: https://github.com/actix/actix-web/pull/2205
 [#2215]: https://github.com/actix/actix-web/pull/2215
+[#2253]: https://github.com/actix/actix-web/pull/2253
 [#2244]: https://github.com/actix/actix-web/pull/2244
 
 

actix-http/Cargo.toml

@@ -84,7 +84,8 @@ trust-dns-resolver = { version = "0.20.0", optional = true }
 actix-server = "2.0.0-beta.3"
 actix-http-test = { version = "3.0.0-beta.4", features = ["openssl"] }
 actix-tls = { version = "3.0.0-beta.5", features = ["openssl"] }
-criterion = "0.3"
+async-stream = "0.3"
+criterion = { version = "0.3", features = ["html_reports"] }
 env_logger = "0.8"
 rcgen = "0.8"
 serde = { version = "1.0", features = ["derive"] }

actix-http/examples/echo.rs

@@ -5,14 +5,13 @@ use actix_server::Server;
 use bytes::BytesMut;
 use futures_util::StreamExt as _;
 use http::header::HeaderValue;
-use log::info;
 
 #[actix_rt::main]
 async fn main() -> io::Result<()> {
     env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
 
     Server::build()
-        .bind("echo", "127.0.0.1:8080", || {
+        .bind("echo", ("127.0.0.1", 8080), || {
             HttpService::build()
                 .client_timeout(1000)
                 .client_disconnect(1000)
@@ -22,7 +21,8 @@ async fn main() -> io::Result<()> {
                         body.extend_from_slice(&item?);
                     }
 
-                    info!("request body: {:?}", body);
+                    log::info!("request body: {:?}", body);
+
                     Ok::<_, Error>(
                         Response::build(StatusCode::OK)
                             .insert_header((

actix-http/examples/echo2.rs

@@ -5,7 +5,6 @@ use actix_http::{Error, HttpService, Request, Response};
 use actix_server::Server;
 use bytes::BytesMut;
 use futures_util::StreamExt as _;
-use log::info;
 
 async fn handle_request(mut req: Request) -> Result<Response<Body>, Error> {
     let mut body = BytesMut::new();
@@ -13,7 +12,8 @@ async fn handle_request(mut req: Request) -> Result<Response<Body>, Error> {
         body.extend_from_slice(&item?)
     }
 
-    info!("request body: {:?}", body);
+    log::info!("request body: {:?}", body);
+
     Ok(Response::build(StatusCode::OK)
         .insert_header(("x-head", HeaderValue::from_static("dummy value!")))
         .body(body))
@@ -24,7 +24,7 @@ async fn main() -> io::Result<()> {
     env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
 
     Server::build()
-        .bind("echo", "127.0.0.1:8080", || {
+        .bind("echo", ("127.0.0.1", 8080), || {
             HttpService::build().finish(handle_request).tcp()
         })?
         .run()

actix-http/examples/hello-world.rs

@@ -1,28 +1,28 @@
-use std::io;
+use std::{convert::Infallible, io};
 
 use actix_http::{http::StatusCode, HttpService, Response};
 use actix_server::Server;
-use actix_utils::future;
 use http::header::HeaderValue;
-use log::info;
 
 #[actix_rt::main]
 async fn main() -> io::Result<()> {
     env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
 
     Server::build()
-        .bind("hello-world", "127.0.0.1:8080", || {
+        .bind("hello-world", ("127.0.0.1", 8080), || {
             HttpService::build()
                 .client_timeout(1000)
                 .client_disconnect(1000)
-                .finish(|_req| {
+                .finish(|req| async move {
-                    info!("{:?}", _req);
+                    log::info!("{:?}", req);
+
                     let mut res = Response::build(StatusCode::OK);
                     res.insert_header((
                         "x-head",
                         HeaderValue::from_static("dummy value!"),
                     ));
-                    future::ok::<_, ()>(res.body("Hello world!"))
+
+                    Ok::<_, Infallible>(res.body("Hello world!"))
                 })
                 .tcp()
         })?

actix-http/examples/streaming-error.rs

@@ -0,0 +1,40 @@
+//! Example showing response body (chunked) stream erroring.
+//!
+//! Test using `nc` or `curl`.
+//! ```sh
+//! $ curl -vN 127.0.0.1:8080
+//! $ echo 'GET / HTTP/1.1\n\n' | nc 127.0.0.1 8080
+//! ```
+
+use std::{convert::Infallible, io, time::Duration};
+
+use actix_http::{body::BodyStream, HttpService, Response};
+use actix_server::Server;
+use async_stream::stream;
+use bytes::Bytes;
+
+#[actix_rt::main]
+async fn main() -> io::Result<()> {
+    env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
+
+    Server::build()
+        .bind("streaming-error", ("127.0.0.1", 8080), || {
+            HttpService::build()
+                .finish(|req| async move {
+                    log::info!("{:?}", req);
+                    let res = Response::ok();
+
+                    Ok::<_, Infallible>(res.set_body(BodyStream::new(stream! {
+                        yield Ok(Bytes::from("123"));
+                        yield Ok(Bytes::from("456"));
+
+                        actix_rt::time::sleep(Duration::from_millis(1000)).await;
+
+                        yield Err(io::Error::new(io::ErrorKind::Other, ""));
+                    })))
+                })
+                .tcp()
+        })?
+        .run()
+        .await
+}

actix-http/src/body/body.rs

@@ -76,7 +76,9 @@ impl MessageBody for AnyBody {
 
             // TODO: MSRV 1.51: poll_map_err
             AnyBody::Message(body) => match ready!(body.as_pin_mut().poll_next(cx)) {
-                Some(Err(err)) => Poll::Ready(Some(Err(err.into()))),
+                Some(Err(err)) => {
+                    Poll::Ready(Some(Err(Error::new_body().with_cause(err))))
+                }
                 Some(Ok(val)) => Poll::Ready(Some(Ok(val))),
                 None => Poll::Ready(None),
             },
@@ -162,9 +164,10 @@ impl From<BytesMut> for AnyBody {
     }
 }
 
-impl<S> From<SizedStream<S>> for AnyBody
+impl<S, E> From<SizedStream<S>> for AnyBody
 where
-    S: Stream<Item = Result<Bytes, Error>> + 'static,
+    S: Stream<Item = Result<Bytes, E>> + 'static,
+    E: Into<Box<dyn StdError>> + 'static,
 {
     fn from(s: SizedStream<S>) -> Body {
         AnyBody::from_message(s)
@@ -174,7 +177,7 @@ where
 impl<S, E> From<BodyStream<S>> for AnyBody
 where
     S: Stream<Item = Result<Bytes, E>> + 'static,
-    E: Into<Error> + 'static,
+    E: Into<Box<dyn StdError>> + 'static,
 {
     fn from(s: BodyStream<S>) -> Body {
         AnyBody::from_message(s)
@@ -222,7 +225,7 @@ impl MessageBody for BoxAnyBody {
     ) -> Poll<Option<Result<Bytes, Self::Error>>> {
         // TODO: MSRV 1.51: poll_map_err
         match ready!(self.0.as_mut().poll_next(cx)) {
-            Some(Err(err)) => Poll::Ready(Some(Err(err.into()))),
+            Some(Err(err)) => Poll::Ready(Some(Err(Error::new_body().with_cause(err)))),
             Some(Ok(val)) => Poll::Ready(Some(Ok(val))),
             None => Poll::Ready(None),
         }

actix-http/src/body/body_stream.rs

@@ -1,4 +1,5 @@
 use std::{
+    error::Error as StdError,
     pin::Pin,
     task::{Context, Poll},
 };
@@ -7,8 +8,6 @@ use bytes::Bytes;
 use futures_core::{ready, Stream};
 use pin_project_lite::pin_project;
 
-use crate::error::Error;
-
 use super::{BodySize, MessageBody};
 
 pin_project! {
@@ -24,7 +23,7 @@ pin_project! {
 impl<S, E> BodyStream<S>
 where
     S: Stream<Item = Result<Bytes, E>>,
-    E: Into<Error>,
+    E: Into<Box<dyn StdError>> + 'static,
 {
     pub fn new(stream: S) -> Self {
         BodyStream { stream }
@@ -34,9 +33,9 @@ where
 impl<S, E> MessageBody for BodyStream<S>
 where
     S: Stream<Item = Result<Bytes, E>>,
-    E: Into<Error>,
+    E: Into<Box<dyn StdError>> + 'static,
 {
-    type Error = Error;
+    type Error = E;
 
     fn size(&self) -> BodySize {
         BodySize::Stream
@@ -56,7 +55,7 @@ where
 
             let chunk = match ready!(stream.poll_next(cx)) {
                 Some(Ok(ref bytes)) if bytes.is_empty() => continue,
-                opt => opt.map(|res| res.map_err(Into::into)),
+                opt => opt,
             };
 
             return Poll::Ready(chunk);
@@ -66,9 +65,16 @@ where
 
 #[cfg(test)]
 mod tests {
-    use actix_rt::pin;
+    use std::{convert::Infallible, time::Duration};
+
+    use actix_rt::{
+        pin,
+        time::{sleep, Sleep},
+    };
     use actix_utils::future::poll_fn;
-    use futures_util::stream;
+    use derive_more::{Display, Error};
+    use futures_core::ready;
+    use futures_util::{stream, FutureExt as _};
 
     use super::*;
     use crate::body::to_bytes;
@@ -78,7 +84,7 @@ mod tests {
         let body = BodyStream::new(stream::iter(
             ["1", "", "2"]
                 .iter()
-                .map(|&v| Ok(Bytes::from(v)) as Result<Bytes, ()>),
+                .map(|&v| Ok::<_, Infallible>(Bytes::from(v))),
         ));
         pin!(body);
 
@@ -103,9 +109,63 @@ mod tests {
         let body = BodyStream::new(stream::iter(
             ["1", "", "2"]
                 .iter()
-                .map(|&v| Ok(Bytes::from(v)) as Result<Bytes, ()>),
+                .map(|&v| Ok::<_, Infallible>(Bytes::from(v))),
         ));
 
         assert_eq!(to_bytes(body).await.ok(), Some(Bytes::from("12")));
     }
+    #[derive(Debug, Display, Error)]
+    #[display(fmt = "stream error")]
+    struct StreamErr;
+
+    #[actix_rt::test]
+    async fn stream_immediate_error() {
+        let body = BodyStream::new(stream::once(async { Err(StreamErr) }));
+        assert!(matches!(to_bytes(body).await, Err(StreamErr)));
+    }
+
+    #[actix_rt::test]
+    async fn stream_delayed_error() {
+        let body =
+            BodyStream::new(stream::iter(vec![Ok(Bytes::from("1")), Err(StreamErr)]));
+        assert!(matches!(to_bytes(body).await, Err(StreamErr)));
+
+        #[pin_project::pin_project(project = TimeDelayStreamProj)]
+        #[derive(Debug)]
+        enum TimeDelayStream {
+            Start,
+            Sleep(Pin<Box<Sleep>>),
+            Done,
+        }
+
+        impl Stream for TimeDelayStream {
+            type Item = Result<Bytes, StreamErr>;
+
+            fn poll_next(
+                mut self: Pin<&mut Self>,
+                cx: &mut Context<'_>,
+            ) -> Poll<Option<Self::Item>> {
+                match self.as_mut().get_mut() {
+                    TimeDelayStream::Start => {
+                        let sleep = sleep(Duration::from_millis(1));
+                        self.as_mut().set(TimeDelayStream::Sleep(Box::pin(sleep)));
+                        cx.waker().wake_by_ref();
+                        Poll::Pending
+                    }
+
+                    TimeDelayStream::Sleep(ref mut delay) => {
+                        ready!(delay.poll_unpin(cx));
+                        self.set(TimeDelayStream::Done);
+                        cx.waker().wake_by_ref();
+                        Poll::Pending
+                    }
+
+                    TimeDelayStream::Done => Poll::Ready(Some(Err(StreamErr))),
+                }
+            }
+        }
+
+        let body = BodyStream::new(TimeDelayStream::Start);
+        assert!(matches!(to_bytes(body).await, Err(StreamErr)));
+    }
 }

actix-http/src/body/mod.rs

@@ -191,11 +191,15 @@ mod tests {
     }
 
     #[actix_rt::test]
-    async fn test_box() {
+    async fn test_box_and_pin() {
         let val = Box::new(());
         pin!(val);
         assert_eq!(val.size(), BodySize::Empty);
         assert!(poll_fn(|cx| val.as_mut().poll_next(cx)).await.is_none());
+
+        let mut val = Box::pin(());
+        assert_eq!(val.size(), BodySize::Empty);
+        assert!(poll_fn(|cx| val.as_mut().poll_next(cx)).await.is_none());
     }
 
     #[actix_rt::test]

actix-http/src/body/sized_stream.rs

@@ -1,4 +1,5 @@
 use std::{
+    error::Error as StdError,
     pin::Pin,
     task::{Context, Poll},
 };
@@ -7,15 +8,13 @@ use bytes::Bytes;
 use futures_core::{ready, Stream};
 use pin_project_lite::pin_project;
 
-use crate::error::Error;
-
 use super::{BodySize, MessageBody};
 
 pin_project! {
     /// Known sized streaming response wrapper.
     ///
-    /// This body implementation should be used if total size of stream is known. Data get sent as is
+    /// This body implementation should be used if total size of stream is known. Data is sent as-is
-    /// without using transfer encoding.
+    /// without using chunked transfer encoding.
     pub struct SizedStream<S> {
         size: u64,
         #[pin]
@@ -23,20 +22,22 @@ pin_project! {
     }
 }
 
-impl<S> SizedStream<S>
+impl<S, E> SizedStream<S>
 where
-    S: Stream<Item = Result<Bytes, Error>>,
+    S: Stream<Item = Result<Bytes, E>>,
+    E: Into<Box<dyn StdError>> + 'static,
 {
     pub fn new(size: u64, stream: S) -> Self {
         SizedStream { size, stream }
     }
 }
 
-impl<S> MessageBody for SizedStream<S>
+impl<S, E> MessageBody for SizedStream<S>
 where
-    S: Stream<Item = Result<Bytes, Error>>,
+    S: Stream<Item = Result<Bytes, E>>,
+    E: Into<Box<dyn StdError>> + 'static,
 {
-    type Error = Error;
+    type Error = E;
 
     fn size(&self) -> BodySize {
         BodySize::Sized(self.size as u64)
@@ -66,6 +67,8 @@ where
 
 #[cfg(test)]
 mod tests {
+    use std::convert::Infallible;
+
     use actix_rt::pin;
     use actix_utils::future::poll_fn;
     use futures_util::stream;
@@ -77,7 +80,11 @@ mod tests {
     async fn skips_empty_chunks() {
         let body = SizedStream::new(
             2,
-            stream::iter(["1", "", "2"].iter().map(|&v| Ok(Bytes::from(v)))),
+            stream::iter(
+                ["1", "", "2"]
+                    .iter()
+                    .map(|&v| Ok::<_, Infallible>(Bytes::from(v))),
+            ),
         );
 
         pin!(body);
@@ -103,7 +110,11 @@ mod tests {
     async fn read_to_bytes() {
         let body = SizedStream::new(
             2,
-            stream::iter(["1", "", "2"].iter().map(|&v| Ok(Bytes::from(v)))),
+            stream::iter(
+                ["1", "", "2"]
+                    .iter()
+                    .map(|&v| Ok::<_, Infallible>(Bytes::from(v))),
+            ),
         );
 
         assert_eq!(to_bytes(body).await.ok(), Some(Bytes::from("12")));

actix-http/src/builder.rs

@@ -1,19 +1,16 @@
-use std::marker::PhantomData;
+use std::{error::Error as StdError, fmt, marker::PhantomData, net, rc::Rc};
-use std::rc::Rc;
-use std::{fmt, net};
 
 use actix_codec::Framed;
 use actix_service::{IntoServiceFactory, Service, ServiceFactory};
 
-use crate::body::MessageBody;
+use crate::{
-use crate::config::{KeepAlive, ServiceConfig};
+    body::{AnyBody, MessageBody},
-use crate::error::Error;
+    config::{KeepAlive, ServiceConfig},
-use crate::h1::{Codec, ExpectHandler, H1Service, UpgradeHandler};
+    h1::{self, ExpectHandler, H1Service, UpgradeHandler},
-use crate::h2::H2Service;
+    h2::H2Service,
-use crate::request::Request;
+    service::HttpService,
-use crate::response::Response;
+    ConnectCallback, Extensions, Request, Response,
-use crate::service::HttpService;
+};
-use crate::{ConnectCallback, Extensions};
 
 /// A HTTP service builder
 ///
@@ -34,7 +31,7 @@ pub struct HttpServiceBuilder<T, S, X = ExpectHandler, U = UpgradeHandler> {
 impl<T, S> HttpServiceBuilder<T, S, ExpectHandler, UpgradeHandler>
 where
     S: ServiceFactory<Request, Config = ()>,
-    S::Error: Into<Error> + 'static,
+    S::Error: Into<Response<AnyBody>> + 'static,
     S::InitError: fmt::Debug,
     <S::Service as Service<Request>>::Future: 'static,
 {
@@ -57,13 +54,13 @@ where
 impl<T, S, X, U> HttpServiceBuilder<T, S, X, U>
 where
     S: ServiceFactory<Request, Config = ()>,
-    S::Error: Into<Error> + 'static,
+    S::Error: Into<Response<AnyBody>> + 'static,
     S::InitError: fmt::Debug,
     <S::Service as Service<Request>>::Future: 'static,
     X: ServiceFactory<Request, Config = (), Response = Request>,
-    X::Error: Into<Error>,
+    X::Error: Into<Response<AnyBody>>,
     X::InitError: fmt::Debug,
-    U: ServiceFactory<(Request, Framed<T, Codec>), Config = (), Response = ()>,
+    U: ServiceFactory<(Request, Framed<T, h1::Codec>), Config = (), Response = ()>,
     U::Error: fmt::Display,
     U::InitError: fmt::Debug,
 {
@@ -123,7 +120,7 @@ where
     where
         F: IntoServiceFactory<X1, Request>,
         X1: ServiceFactory<Request, Config = (), Response = Request>,
-        X1::Error: Into<Error>,
+        X1::Error: Into<Response<AnyBody>>,
         X1::InitError: fmt::Debug,
     {
         HttpServiceBuilder {
@@ -145,8 +142,8 @@ where
     /// and this service get called with original request and framed object.
     pub fn upgrade<F, U1>(self, upgrade: F) -> HttpServiceBuilder<T, S, X, U1>
     where
-        F: IntoServiceFactory<U1, (Request, Framed<T, Codec>)>,
+        F: IntoServiceFactory<U1, (Request, Framed<T, h1::Codec>)>,
-        U1: ServiceFactory<(Request, Framed<T, Codec>), Config = (), Response = ()>,
+        U1: ServiceFactory<(Request, Framed<T, h1::Codec>), Config = (), Response = ()>,
         U1::Error: fmt::Display,
         U1::InitError: fmt::Debug,
     {
@@ -181,7 +178,7 @@ where
     where
         B: MessageBody,
         F: IntoServiceFactory<S, Request>,
-        S::Error: Into<Error>,
+        S::Error: Into<Response<AnyBody>>,
         S::InitError: fmt::Debug,
         S::Response: Into<Response<B>>,
     {
@@ -203,12 +200,12 @@ where
     pub fn h2<F, B>(self, service: F) -> H2Service<T, S, B>
     where
         F: IntoServiceFactory<S, Request>,
-        S::Error: Into<Error> + 'static,
+        S::Error: Into<Response<AnyBody>> + 'static,
         S::InitError: fmt::Debug,
         S::Response: Into<Response<B>> + 'static,
 
         B: MessageBody + 'static,
-        B::Error: Into<Error>,
+        B::Error: Into<Box<dyn StdError>>,
     {
         let cfg = ServiceConfig::new(
             self.keep_alive,
@@ -226,12 +223,12 @@ where
     pub fn finish<F, B>(self, service: F) -> HttpService<T, S, B, X, U>
     where
         F: IntoServiceFactory<S, Request>,
-        S::Error: Into<Error> + 'static,
+        S::Error: Into<Response<AnyBody>> + 'static,
         S::InitError: fmt::Debug,
         S::Response: Into<Response<B>> + 'static,
 
         B: MessageBody + 'static,
-        B::Error: Into<Error>,
+        B::Error: Into<Box<dyn StdError>>,
     {
         let cfg = ServiceConfig::new(
             self.keep_alive,

actix-http/src/client/error.rs

@@ -1,15 +1,16 @@
-use std::io;
+use std::{error::Error as StdError, fmt, io};
 
 use derive_more::{Display, From};
 
 #[cfg(feature = "openssl")]
 use actix_tls::accept::openssl::SslError;
 
-use crate::error::{Error, ParseError, ResponseError};
+use crate::error::{Error, ParseError};
-use crate::http::{Error as HttpError, StatusCode};
+use crate::http::Error as HttpError;
 
 /// A set of errors that can occur while connecting to an HTTP host
 #[derive(Debug, Display, From)]
+#[non_exhaustive]
 pub enum ConnectError {
     /// SSL feature is not enabled
     #[display(fmt = "SSL is not supported")]
@@ -64,6 +65,7 @@ impl From<actix_tls::connect::ConnectError> for ConnectError {
 }
 
 #[derive(Debug, Display, From)]
+#[non_exhaustive]
 pub enum InvalidUrl {
     #[display(fmt = "Missing URL scheme")]
     MissingScheme,
@@ -82,6 +84,7 @@ impl std::error::Error for InvalidUrl {}
 
 /// A set of errors that can occur during request sending and response reading
 #[derive(Debug, Display, From)]
+#[non_exhaustive]
 pub enum SendRequestError {
     /// Invalid URL
     #[display(fmt = "Invalid URL: {}", _0)]
@@ -115,25 +118,17 @@ pub enum SendRequestError {
 
     /// Error sending request body
     Body(Error),
+
+    /// Other errors that can occur after submitting a request.
+    #[display(fmt = "{:?}: {}", _1, _0)]
+    Custom(Box<dyn StdError>, Box<dyn fmt::Debug>),
 }
 
 impl std::error::Error for SendRequestError {}
 
-/// Convert `SendRequestError` to a server `Response`
-impl ResponseError for SendRequestError {
-    fn status_code(&self) -> StatusCode {
-        match *self {
-            SendRequestError::Connect(ConnectError::Timeout) => {
-                StatusCode::GATEWAY_TIMEOUT
-            }
-            SendRequestError::Connect(_) => StatusCode::BAD_REQUEST,
-            _ => StatusCode::INTERNAL_SERVER_ERROR,
-        }
-    }
-}
-
 /// A set of errors that can occur during freezing a request
 #[derive(Debug, Display, From)]
+#[non_exhaustive]
 pub enum FreezeRequestError {
     /// Invalid URL
     #[display(fmt = "Invalid URL: {}", _0)]
@@ -142,15 +137,20 @@ pub enum FreezeRequestError {
     /// HTTP error
     #[display(fmt = "{}", _0)]
     Http(HttpError),
+
+    /// Other errors that can occur after submitting a request.
+    #[display(fmt = "{:?}: {}", _1, _0)]
+    Custom(Box<dyn StdError>, Box<dyn fmt::Debug>),
 }
 
 impl std::error::Error for FreezeRequestError {}
 
 impl From<FreezeRequestError> for SendRequestError {
-    fn from(e: FreezeRequestError) -> Self {
+    fn from(err: FreezeRequestError) -> Self {
-        match e {
+        match err {
-            FreezeRequestError::Url(e) => e.into(),
+            FreezeRequestError::Url(err) => err.into(),
-            FreezeRequestError::Http(e) => e.into(),
+            FreezeRequestError::Http(err) => err.into(),
+            FreezeRequestError::Custom(err, msg) => SendRequestError::Custom(err, msg),
         }
     }
 }

actix-http/src/encoding/encoder.rs

@@ -133,9 +133,7 @@ where
             },
             EncoderBodyProj::BoxedStream(ref mut b) => {
                 match ready!(b.as_pin_mut().poll_next(cx)) {
-                    Some(Err(err)) => {
+                    Some(Err(err)) => Poll::Ready(Some(Err(EncoderError::Boxed(err)))),
-                        Poll::Ready(Some(Err(EncoderError::Boxed(err.into()))))
-                    }
                     Some(Ok(val)) => Poll::Ready(Some(Ok(val))),
                     None => Poll::Ready(None),
                 }
@@ -337,7 +335,7 @@ pub enum EncoderError<E> {
     Body(E),
 
     #[display(fmt = "boxed")]
-    Boxed(Error),
+    Boxed(Box<dyn StdError>),
 
     #[display(fmt = "blocking")]
     Blocking(BlockingError),
@@ -346,19 +344,19 @@ pub enum EncoderError<E> {
     Io(io::Error),
 }
 
-impl<E: StdError> StdError for EncoderError<E> {
+impl<E: StdError + 'static> StdError for EncoderError<E> {
     fn source(&self) -> Option<&(dyn StdError + 'static)> {
-        None
+        match self {
-    }
+            EncoderError::Body(err) => Some(err),
-}
+            EncoderError::Boxed(err) => Some(&**err),
-
+            EncoderError::Blocking(err) => Some(err),
-impl<E: Into<Error>> From<EncoderError<E>> for Error {
+            EncoderError::Io(err) => Some(err),
-    fn from(err: EncoderError<E>) -> Self {
-        match err {
-            EncoderError::Body(err) => err.into(),
-            EncoderError::Boxed(err) => err,
-            EncoderError::Blocking(err) => err.into(),
-            EncoderError::Io(err) => err.into(),
         }
     }
 }
+
+impl<E: StdError + 'static> From<EncoderError<E>> for crate::Error {
+    fn from(err: EncoderError<E>) -> Self {
+        crate::Error::new_encoder().with_cause(err)
+    }
+}

actix-http/src/error.rs

@@ -1,174 +1,155 @@
 //! Error and Result module
 
-use std::{
+use std::{error::Error as StdError, fmt, io, str::Utf8Error, string::FromUtf8Error};
-    error::Error as StdError,
-    fmt,
-    io::{self, Write as _},
-    str::Utf8Error,
-    string::FromUtf8Error,
-};
 
-use bytes::BytesMut;
 use derive_more::{Display, Error, From};
-use http::{header, uri::InvalidUri, StatusCode};
+use http::{uri::InvalidUri, StatusCode};
-use serde::de::value::Error as DeError;
 
-use crate::{body::Body, helpers::Writer, Response};
+use crate::{
+    body::{AnyBody, Body},
+    ws, Response,
+};
 
 pub use http::Error as HttpError;
 
-/// General purpose actix web error.
-///
-/// An actix web error is used to carry errors from `std::error`
-/// through actix in a convenient way.  It can be created through
-/// converting errors with `into()`.
-///
-/// Whenever it is created from an external object a response error is created
-/// for it that can be used to create an HTTP response from it this means that
-/// if you have access to an actix `Error` you can always get a
-/// `ResponseError` reference from it.
 pub struct Error {
-    cause: Box<dyn ResponseError>,
+    inner: Box<ErrorInner>,
+}
+
+pub(crate) struct ErrorInner {
+    #[allow(dead_code)]
+    kind: Kind,
+    cause: Option<Box<dyn StdError>>,
 }
 
 impl Error {
-    /// Returns the reference to the underlying `ResponseError`.
+    fn new(kind: Kind) -> Self {
-    pub fn as_response_error(&self) -> &dyn ResponseError {
+        Self {
-        self.cause.as_ref()
+            inner: Box::new(ErrorInner { kind, cause: None }),
+        }
     }
 
-    /// Similar to `as_response_error` but downcasts.
+    pub(crate) fn new_http() -> Self {
-    pub fn as_error<T: ResponseError + 'static>(&self) -> Option<&T> {
+        Self::new(Kind::Http)
-        <dyn ResponseError>::downcast_ref(self.cause.as_ref())
+    }
+
+    pub(crate) fn new_parse() -> Self {
+        Self::new(Kind::Parse)
+    }
+
+    pub(crate) fn new_payload() -> Self {
+        Self::new(Kind::Payload)
+    }
+
+    pub(crate) fn new_body() -> Self {
+        Self::new(Kind::Body)
+    }
+
+    pub(crate) fn new_send_response() -> Self {
+        Self::new(Kind::SendResponse)
+    }
+
+    // TODO: remove allow
+    #[allow(dead_code)]
+    pub(crate) fn new_io() -> Self {
+        Self::new(Kind::Io)
+    }
+
+    pub(crate) fn new_encoder() -> Self {
+        Self::new(Kind::Encoder)
+    }
+
+    pub(crate) fn new_ws() -> Self {
+        Self::new(Kind::Ws)
+    }
+
+    pub(crate) fn with_cause(mut self, cause: impl Into<Box<dyn StdError>>) -> Self {
+        self.inner.cause = Some(cause.into());
+        self
     }
 }
 
-/// Errors that can generate responses.
+impl From<Error> for Response<AnyBody> {
-pub trait ResponseError: fmt::Debug + fmt::Display {
+    fn from(err: Error) -> Self {
-    /// Returns appropriate status code for error.
+        let status_code = match err.inner.kind {
-    ///
+            Kind::Parse => StatusCode::BAD_REQUEST,
-    /// A 500 Internal Server Error is used by default. If [error_response](Self::error_response) is
+            _ => StatusCode::INTERNAL_SERVER_ERROR,
-    /// also implemented and does not call `self.status_code()`, then this will not be used.
+        };
-    fn status_code(&self) -> StatusCode {
-        StatusCode::INTERNAL_SERVER_ERROR
-    }
 
-    /// Creates full response for error.
+        Response::new(status_code).set_body(Body::from(err.to_string()))
-    ///
-    /// By default, the generated response uses a 500 Internal Server Error status code, a
-    /// `Content-Type` of `text/plain`, and the body is set to `Self`'s `Display` impl.
-    fn error_response(&self) -> Response<Body> {
-        let mut resp = Response::new(self.status_code());
-        let mut buf = BytesMut::new();
-        let _ = write!(Writer(&mut buf), "{}", self);
-        resp.headers_mut().insert(
-            header::CONTENT_TYPE,
-            header::HeaderValue::from_static("text/plain; charset=utf-8"),
-        );
-        resp.set_body(Body::from(buf))
     }
-
-    downcast_get_type_id!();
 }
 
-downcast!(ResponseError);
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Display)]
+pub enum Kind {
+    #[display(fmt = "error processing HTTP")]
+    Http,
 
-impl fmt::Display for Error {
+    #[display(fmt = "error parsing HTTP message")]
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+    Parse,
-        fmt::Display::fmt(&self.cause, f)
+
-    }
+    #[display(fmt = "request payload read error")]
+    Payload,
+
+    #[display(fmt = "response body write error")]
+    Body,
+
+    #[display(fmt = "send response error")]
+    SendResponse,
+
+    #[display(fmt = "error in WebSocket process")]
+    Ws,
+
+    #[display(fmt = "connection error")]
+    Io,
+
+    #[display(fmt = "encoder error")]
+    Encoder,
 }
 
 impl fmt::Debug for Error {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{:?}", &self.cause)
+        // TODO: more detail
+        f.write_str("actix_http::Error")
     }
 }
 
-impl std::error::Error for Error {
+impl fmt::Display for Error {
-    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        None
+        match self.inner.cause.as_ref() {
+            Some(err) => write!(f, "{}: {}", &self.inner.kind, err),
+            None => write!(f, "{}", &self.inner.kind),
+        }
     }
 }
 
-impl From<()> for Error {
+impl StdError for Error {
-    fn from(_: ()) -> Self {
+    fn source(&self) -> Option<&(dyn StdError + 'static)> {
-        Error::from(UnitError)
+        self.inner.cause.as_ref().map(|err| err.as_ref())
     }
 }
 
 impl From<std::convert::Infallible> for Error {
-    fn from(_: std::convert::Infallible) -> Self {
+    fn from(err: std::convert::Infallible) -> Self {
-        // hint that an error that will never happen
+        match err {}
-        unreachable!()
     }
 }
 
-/// Convert `Error` to a `Response` instance
+impl From<ws::ProtocolError> for Error {
-impl From<Error> for Response<Body> {
+    fn from(err: ws::ProtocolError) -> Self {
-    fn from(err: Error) -> Self {
+        Self::new_ws().with_cause(err)
-        Response::from_error(err)
     }
 }
 
-/// `Error` for any error that implements `ResponseError`
+impl From<HttpError> for Error {
-impl<T: ResponseError + 'static> From<T> for Error {
+    fn from(err: HttpError) -> Self {
-    fn from(err: T) -> Error {
+        Self::new_http().with_cause(err)
-        Error {
-            cause: Box::new(err),
-        }
     }
 }
 
-#[derive(Debug, Display, Error)]
+impl From<ws::HandshakeError> for Error {
-#[display(fmt = "Unknown Error")]
+    fn from(err: ws::HandshakeError) -> Self {
-struct UnitError;
+        Self::new_ws().with_cause(err)
-
-impl ResponseError for Box<dyn StdError + 'static> {}
-
-/// Returns [`StatusCode::INTERNAL_SERVER_ERROR`] for [`UnitError`].
-impl ResponseError for UnitError {}
-
-/// Returns [`StatusCode::INTERNAL_SERVER_ERROR`] for [`actix_tls::accept::openssl::SslError`].
-#[cfg(feature = "openssl")]
-impl ResponseError for actix_tls::accept::openssl::SslError {}
-
-/// Returns [`StatusCode::BAD_REQUEST`] for [`DeError`].
-impl ResponseError for DeError {
-    fn status_code(&self) -> StatusCode {
-        StatusCode::BAD_REQUEST
-    }
-}
-
-/// Returns [`StatusCode::BAD_REQUEST`] for [`Utf8Error`].
-impl ResponseError for Utf8Error {
-    fn status_code(&self) -> StatusCode {
-        StatusCode::BAD_REQUEST
-    }
-}
-
-/// Returns [`StatusCode::INTERNAL_SERVER_ERROR`] for [`HttpError`].
-impl ResponseError for HttpError {}
-
-/// Inspects the underlying [`io::ErrorKind`] and returns an appropriate status code.
-///
-/// If the error is [`io::ErrorKind::NotFound`], [`StatusCode::NOT_FOUND`] is returned. If the
-/// error is [`io::ErrorKind::PermissionDenied`], [`StatusCode::FORBIDDEN`] is returned. Otherwise,
-/// [`StatusCode::INTERNAL_SERVER_ERROR`] is returned.
-impl ResponseError for io::Error {
-    fn status_code(&self) -> StatusCode {
-        match self.kind() {
-            io::ErrorKind::NotFound => StatusCode::NOT_FOUND,
-            io::ErrorKind::PermissionDenied => StatusCode::FORBIDDEN,
-            _ => StatusCode::INTERNAL_SERVER_ERROR,
-        }
-    }
-}
-
-/// Returns [`StatusCode::BAD_REQUEST`] for [`header::InvalidHeaderValue`].
-impl ResponseError for header::InvalidHeaderValue {
-    fn status_code(&self) -> StatusCode {
-        StatusCode::BAD_REQUEST
     }
 }
 
@@ -218,13 +199,6 @@ pub enum ParseError {
     Utf8(Utf8Error),
 }
 
-/// Return `BadRequest` for `ParseError`
-impl ResponseError for ParseError {
-    fn status_code(&self) -> StatusCode {
-        StatusCode::BAD_REQUEST
-    }
-}
-
 impl From<io::Error> for ParseError {
     fn from(err: io::Error) -> ParseError {
         ParseError::Io(err)
@@ -263,14 +237,23 @@ impl From<httparse::Error> for ParseError {
     }
 }
 
+impl From<ParseError> for Error {
+    fn from(err: ParseError) -> Self {
+        Self::new_parse().with_cause(err)
+    }
+}
+
+impl From<ParseError> for Response<AnyBody> {
+    fn from(err: ParseError) -> Self {
+        Error::from(err).into()
+    }
+}
+
 /// A set of errors that can occur running blocking tasks in thread pool.
 #[derive(Debug, Display, Error)]
 #[display(fmt = "Blocking thread pool is gone")]
 pub struct BlockingError;
 
-/// `InternalServerError` for `BlockingError`
-impl ResponseError for BlockingError {}
-
 /// A set of errors that can occur during payload parsing.
 #[derive(Debug, Display)]
 #[non_exhaustive]
@@ -344,16 +327,9 @@ impl From<BlockingError> for PayloadError {
     }
 }
 
-/// `PayloadError` returns two possible results:
+impl From<PayloadError> for Error {
-///
+    fn from(err: PayloadError) -> Self {
-/// - `Overflow` returns `PayloadTooLarge`
+        Self::new_payload().with_cause(err)
-/// - Other errors returns `BadRequest`
-impl ResponseError for PayloadError {
-    fn status_code(&self) -> StatusCode {
-        match *self {
-            PayloadError::Overflow => StatusCode::PAYLOAD_TOO_LARGE,
-            _ => StatusCode::BAD_REQUEST,
-        }
     }
 }
 
@@ -362,13 +338,19 @@ impl ResponseError for PayloadError {
 #[non_exhaustive]
 pub enum DispatchError {
     /// Service error
-    Service(Error),
+    // FIXME: display and error type
+    #[display(fmt = "Service Error")]
+    Service(#[error(not(source))] Response<AnyBody>),
+
+    /// Body error
+    // FIXME: display and error type
+    #[display(fmt = "Body Error")]
+    Body(#[error(not(source))] Box<dyn StdError>),
 
     /// Upgrade service error
     Upgrade,
 
-    /// An `io::Error` that occurred while trying to read or write to a network
+    /// An `io::Error` that occurred while trying to read or write to a network stream.
-    /// stream.
     #[display(fmt = "IO error: {}", _0)]
     Io(io::Error),
 
@@ -434,12 +416,6 @@ mod content_type_test_impls {
     }
 }
 
-impl ResponseError for ContentTypeError {
-    fn status_code(&self) -> StatusCode {
-        StatusCode::BAD_REQUEST
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -448,42 +424,36 @@ mod tests {
 
     #[test]
     fn test_into_response() {
-        let resp: Response<Body> = ParseError::Incomplete.error_response();
+        let resp: Response<AnyBody> = ParseError::Incomplete.into();
         assert_eq!(resp.status(), StatusCode::BAD_REQUEST);
 
         let err: HttpError = StatusCode::from_u16(10000).err().unwrap().into();
-        let resp: Response<Body> = err.error_response();
+        let resp: Response<AnyBody> = Error::new_http().with_cause(err).into();
         assert_eq!(resp.status(), StatusCode::INTERNAL_SERVER_ERROR);
     }
 
     #[test]
     fn test_as_response() {
         let orig = io::Error::new(io::ErrorKind::Other, "other");
-        let e: Error = ParseError::Io(orig).into();
+        let err: Error = ParseError::Io(orig).into();
-        assert_eq!(format!("{}", e.as_response_error()), "IO error: other");
+        assert_eq!(
-    }
+            format!("{}", err),
-
+            "error parsing HTTP message: IO error: other"
-    #[test]
+        );
-    fn test_error_cause() {
-        let orig = io::Error::new(io::ErrorKind::Other, "other");
-        let desc = orig.to_string();
-        let e = Error::from(orig);
-        assert_eq!(format!("{}", e.as_response_error()), desc);
     }
 
     #[test]
     fn test_error_display() {
         let orig = io::Error::new(io::ErrorKind::Other, "other");
-        let desc = orig.to_string();
+        let err = Error::new_io().with_cause(orig);
-        let e = Error::from(orig);
+        assert_eq!("connection error: other", err.to_string());
-        assert_eq!(format!("{}", e), desc);
     }
 
     #[test]
     fn test_error_http_response() {
         let orig = io::Error::new(io::ErrorKind::Other, "other");
-        let e = Error::from(orig);
+        let err = Error::new_io().with_cause(orig);
-        let resp: Response<Body> = e.into();
+        let resp: Response<AnyBody> = err.into();
         assert_eq!(resp.status(), StatusCode::INTERNAL_SERVER_ERROR);
     }
 
@@ -535,14 +505,4 @@ mod tests {
         from!(httparse::Error::TooManyHeaders => ParseError::TooLarge);
         from!(httparse::Error::Version => ParseError::Version);
     }
-
-    #[test]
-    fn test_error_casting() {
-        let err = PayloadError::Overflow;
-        let resp_err: &dyn ResponseError = &err;
-        let err = resp_err.downcast_ref::<PayloadError>().unwrap();
-        assert_eq!(err.to_string(), "Payload reached size limit.");
-        let not_err = resp_err.downcast_ref::<ContentTypeError>();
-        assert!(not_err.is_none());
-    }
 }

actix-http/src/h1/dispatcher.rs

@@ -1,5 +1,6 @@
 use std::{
     collections::VecDeque,
+    error::Error as StdError,
     fmt,
     future::Future,
     io, mem, net,
@@ -17,19 +18,19 @@ use futures_core::ready;
 use log::{error, trace};
 use pin_project::pin_project;
 
-use crate::body::{Body, BodySize, MessageBody};
+use crate::{
-use crate::config::ServiceConfig;
+    body::{AnyBody, BodySize, MessageBody},
-use crate::error::{DispatchError, Error};
+    config::ServiceConfig,
-use crate::error::{ParseError, PayloadError};
+    error::{DispatchError, ParseError, PayloadError},
-use crate::http::StatusCode;
+    service::HttpFlow,
-use crate::request::Request;
+    OnConnectData, Request, Response, StatusCode,
-use crate::response::Response;
+};
-use crate::service::HttpFlow;
-use crate::OnConnectData;
 
-use super::codec::Codec;
+use super::{
-use super::payload::{Payload, PayloadSender, PayloadStatus};
+    codec::Codec,
-use super::{Message, MessageType};
+    payload::{Payload, PayloadSender, PayloadStatus},
+    Message, MessageType,
+};
 
 const LW_BUFFER_SIZE: usize = 1024;
 const HW_BUFFER_SIZE: usize = 1024 * 8;
@@ -50,13 +51,13 @@ bitflags! {
 pub struct Dispatcher<T, S, B, X, U>
 where
     S: Service<Request>,
-    S::Error: Into<Error>,
+    S::Error: Into<Response<AnyBody>>,
 
     B: MessageBody,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 
     X: Service<Request, Response = Request>,
-    X::Error: Into<Error>,
+    X::Error: Into<Response<AnyBody>>,
 
     U: Service<(Request, Framed<T, Codec>), Response = ()>,
     U::Error: fmt::Display,
@@ -72,13 +73,13 @@ where
 enum DispatcherState<T, S, B, X, U>
 where
     S: Service<Request>,
-    S::Error: Into<Error>,
+    S::Error: Into<Response<AnyBody>>,
 
     B: MessageBody,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 
     X: Service<Request, Response = Request>,
-    X::Error: Into<Error>,
+    X::Error: Into<Response<AnyBody>>,
 
     U: Service<(Request, Framed<T, Codec>), Response = ()>,
     U::Error: fmt::Display,
@@ -91,13 +92,13 @@ where
 struct InnerDispatcher<T, S, B, X, U>
 where
     S: Service<Request>,
-    S::Error: Into<Error>,
+    S::Error: Into<Response<AnyBody>>,
 
     B: MessageBody,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 
     X: Service<Request, Response = Request>,
-    X::Error: Into<Error>,
+    X::Error: Into<Response<AnyBody>>,
 
     U: Service<(Request, Framed<T, Codec>), Response = ()>,
     U::Error: fmt::Display,
@@ -136,13 +137,13 @@ where
     X: Service<Request, Response = Request>,
 
     B: MessageBody,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 {
     None,
     ExpectCall(#[pin] X::Future),
     ServiceCall(#[pin] S::Future),
     SendPayload(#[pin] B),
-    SendErrorPayload(#[pin] Body),
+    SendErrorPayload(#[pin] AnyBody),
 }
 
 impl<S, B, X> State<S, B, X>
@@ -152,7 +153,7 @@ where
     X: Service<Request, Response = Request>,
 
     B: MessageBody,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 {
     fn is_empty(&self) -> bool {
         matches!(self, State::None)
@@ -170,14 +171,14 @@ where
     T: AsyncRead + AsyncWrite + Unpin,
 
     S: Service<Request>,
-    S::Error: Into<Error>,
+    S::Error: Into<Response<AnyBody>>,
     S::Response: Into<Response<B>>,
 
     B: MessageBody,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 
     X: Service<Request, Response = Request>,
-    X::Error: Into<Error>,
+    X::Error: Into<Response<AnyBody>>,
 
     U: Service<(Request, Framed<T, Codec>), Response = ()>,
     U::Error: fmt::Display,
@@ -231,14 +232,14 @@ where
     T: AsyncRead + AsyncWrite + Unpin,
 
     S: Service<Request>,
-    S::Error: Into<Error>,
+    S::Error: Into<Response<AnyBody>>,
     S::Response: Into<Response<B>>,
 
     B: MessageBody,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 
     X: Service<Request, Response = Request>,
-    X::Error: Into<Error>,
+    X::Error: Into<Response<AnyBody>>,
 
     U: Service<(Request, Framed<T, Codec>), Response = ()>,
     U::Error: fmt::Display,
@@ -334,7 +335,7 @@ where
     fn send_error_response(
         mut self: Pin<&mut Self>,
         message: Response<()>,
-        body: Body,
+        body: AnyBody,
     ) -> Result<(), DispatchError> {
         let size = self.as_mut().send_response_inner(message, &body)?;
         let state = match size {
@@ -379,7 +380,7 @@ where
                         // send_response would update InnerDispatcher state to SendPayload or
                         // None(If response body is empty).
                         // continue loop to poll it.
-                        self.as_mut().send_error_response(res, Body::Empty)?;
+                        self.as_mut().send_error_response(res, AnyBody::Empty)?;
                     }
 
                     // return with upgrade request and poll it exclusively.
@@ -399,7 +400,7 @@ where
 
                     // send service call error as response
                     Poll::Ready(Err(err)) => {
-                        let res = Response::from_error(err);
+                        let res: Response<AnyBody> = err.into();
                         let (res, body) = res.replace_body(());
                         self.as_mut().send_error_response(res, body)?;
                     }
@@ -438,7 +439,7 @@ where
                             }
 
                             Poll::Ready(Some(Err(err))) => {
-                                return Err(DispatchError::Service(err.into()))
+                                return Err(DispatchError::Body(err.into()))
                             }
 
                             Poll::Pending => return Ok(PollResponse::DoNothing),
@@ -473,7 +474,7 @@ where
                             }
 
                             Poll::Ready(Some(Err(err))) => {
-                                return Err(DispatchError::Service(err))
+                                return Err(DispatchError::Service(err.into()))
                             }
 
                             Poll::Pending => return Ok(PollResponse::DoNothing),
@@ -496,7 +497,7 @@ where
 
                     // send expect error as response
                     Poll::Ready(Err(err)) => {
-                        let res = Response::from_error(err);
+                        let res: Response<AnyBody> = err.into();
                         let (res, body) = res.replace_body(());
                         self.as_mut().send_error_response(res, body)?;
                     }
@@ -546,7 +547,7 @@ where
                         // to notify the dispatcher a new state is set and the outer loop
                         // should be continue.
                         Poll::Ready(Err(err)) => {
-                            let res = Response::from_error(err);
+                            let res: Response<AnyBody> = err.into();
                             let (res, body) = res.replace_body(());
                             return self.send_error_response(res, body);
                         }
@@ -566,7 +567,7 @@ where
                         Poll::Pending => Ok(()),
                         // see the comment on ExpectCall state branch's Ready(Err(err)).
                         Poll::Ready(Err(err)) => {
-                            let res = Response::from_error(err);
+                            let res: Response<AnyBody> = err.into();
                             let (res, body) = res.replace_body(());
                             self.send_error_response(res, body)
                         }
@@ -772,7 +773,7 @@ where
                                 trace!("Slow request timeout");
                                 let _ = self.as_mut().send_error_response(
                                     Response::with_body(StatusCode::REQUEST_TIMEOUT, ()),
-                                    Body::Empty,
+                                    AnyBody::Empty,
                                 );
                                 this = self.project();
                                 this.flags.insert(Flags::STARTED | Flags::SHUTDOWN);
@@ -909,14 +910,14 @@ where
     T: AsyncRead + AsyncWrite + Unpin,
 
     S: Service<Request>,
-    S::Error: Into<Error>,
+    S::Error: Into<Response<AnyBody>>,
     S::Response: Into<Response<B>>,
 
     B: MessageBody,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 
     X: Service<Request, Response = Request>,
-    X::Error: Into<Error>,
+    X::Error: Into<Response<AnyBody>>,
 
     U: Service<(Request, Framed<T, Codec>), Response = ()>,
     U::Error: fmt::Display,
@@ -1067,16 +1068,17 @@ mod tests {
         }
     }
 
-    fn ok_service() -> impl Service<Request, Response = Response<Body>, Error = Error> {
+    fn ok_service() -> impl Service<Request, Response = Response<AnyBody>, Error = Error>
+    {
         fn_service(|_req: Request| ready(Ok::<_, Error>(Response::ok())))
     }
 
     fn echo_path_service(
-    ) -> impl Service<Request, Response = Response<Body>, Error = Error> {
+    ) -> impl Service<Request, Response = Response<AnyBody>, Error = Error> {
         fn_service(|req: Request| {
             let path = req.path().as_bytes();
             ready(Ok::<_, Error>(
-                Response::ok().set_body(Body::from_slice(path)),
+                Response::ok().set_body(AnyBody::from_slice(path)),
             ))
         })
     }

actix-http/src/h1/encoder.rs

@@ -6,14 +6,15 @@ use std::{cmp, io};
 
 use bytes::{BufMut, BytesMut};
 
-use crate::body::BodySize;
+use crate::{
-use crate::config::ServiceConfig;
+    body::BodySize,
-use crate::header::{map::Value, HeaderName};
+    config::ServiceConfig,
-use crate::helpers;
+    header::{map::Value, HeaderMap, HeaderName},
-use crate::http::header::{CONNECTION, CONTENT_LENGTH, DATE, TRANSFER_ENCODING};
+    header::{CONNECTION, CONTENT_LENGTH, DATE, TRANSFER_ENCODING},
-use crate::http::{HeaderMap, StatusCode, Version};
+    helpers,
-use crate::message::{ConnectionType, RequestHeadType};
+    message::{ConnectionType, RequestHeadType},
-use crate::response::Response;
+    Response, StatusCode, Version,
+};
 
 const AVERAGE_HEADER_SIZE: usize = 30;
 
@@ -287,7 +288,7 @@ impl MessageType for RequestHeadType {
         let head = self.as_ref();
         dst.reserve(256 + head.headers.len() * AVERAGE_HEADER_SIZE);
         write!(
-            helpers::Writer(dst),
+            helpers::MutWriter(dst),
             "{} {} {}",
             head.method,
             head.uri.path_and_query().map(|u| u.as_str()).unwrap_or("/"),
@@ -420,7 +421,7 @@ impl TransferEncoding {
                     *eof = true;
                     buf.extend_from_slice(b"0\r\n\r\n");
                 } else {
-                    writeln!(helpers::Writer(buf), "{:X}\r", msg.len())
+                    writeln!(helpers::MutWriter(buf), "{:X}\r", msg.len())
                         .map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
 
                     buf.reserve(msg.len() + 2);

actix-http/src/h1/service.rs

@@ -1,7 +1,11 @@
-use std::marker::PhantomData;
+use std::{
-use std::rc::Rc;
+    error::Error as StdError,
-use std::task::{Context, Poll};
+    fmt,
-use std::{fmt, net};
+    marker::PhantomData,
+    net,
+    rc::Rc,
+    task::{Context, Poll},
+};
 
 use actix_codec::{AsyncRead, AsyncWrite, Framed};
 use actix_rt::net::TcpStream;
@@ -11,17 +15,15 @@ use actix_service::{
 use actix_utils::future::ready;
 use futures_core::future::LocalBoxFuture;
 
-use crate::body::MessageBody;
+use crate::{
-use crate::config::ServiceConfig;
+    body::{AnyBody, MessageBody},
-use crate::error::{DispatchError, Error};
+    config::ServiceConfig,
-use crate::request::Request;
+    error::DispatchError,
-use crate::response::Response;
+    service::HttpServiceHandler,
-use crate::service::HttpServiceHandler;
+    ConnectCallback, OnConnectData, Request, Response,
-use crate::{ConnectCallback, OnConnectData};
+};
 
-use super::codec::Codec;
+use super::{codec::Codec, dispatcher::Dispatcher, ExpectHandler, UpgradeHandler};
-use super::dispatcher::Dispatcher;
-use super::{ExpectHandler, UpgradeHandler};
 
 /// `ServiceFactory` implementation for HTTP1 transport
 pub struct H1Service<T, S, B, X = ExpectHandler, U = UpgradeHandler> {
@@ -36,7 +38,7 @@ pub struct H1Service<T, S, B, X = ExpectHandler, U = UpgradeHandler> {
 impl<T, S, B> H1Service<T, S, B>
 where
     S: ServiceFactory<Request, Config = ()>,
-    S::Error: Into<Error>,
+    S::Error: Into<Response<AnyBody>>,
     S::InitError: fmt::Debug,
     S::Response: Into<Response<B>>,
     B: MessageBody,
@@ -61,21 +63,21 @@ impl<S, B, X, U> H1Service<TcpStream, S, B, X, U>
 where
     S: ServiceFactory<Request, Config = ()>,
     S::Future: 'static,
-    S::Error: Into<Error>,
+    S::Error: Into<Response<AnyBody>>,
     S::InitError: fmt::Debug,
     S::Response: Into<Response<B>>,
 
     B: MessageBody,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 
     X: ServiceFactory<Request, Config = (), Response = Request>,
     X::Future: 'static,
-    X::Error: Into<Error>,
+    X::Error: Into<Response<AnyBody>>,
     X::InitError: fmt::Debug,
 
     U: ServiceFactory<(Request, Framed<TcpStream, Codec>), Config = (), Response = ()>,
     U::Future: 'static,
-    U::Error: fmt::Display + Into<Error>,
+    U::Error: fmt::Display + Into<Response<AnyBody>>,
     U::InitError: fmt::Debug,
 {
     /// Create simple tcp stream service
@@ -110,16 +112,16 @@ mod openssl {
     where
         S: ServiceFactory<Request, Config = ()>,
         S::Future: 'static,
-        S::Error: Into<Error>,
+        S::Error: Into<Response<AnyBody>>,
         S::InitError: fmt::Debug,
         S::Response: Into<Response<B>>,
 
         B: MessageBody,
-        B::Error: Into<Error>,
+        B::Error: Into<Box<dyn StdError>>,
 
         X: ServiceFactory<Request, Config = (), Response = Request>,
         X::Future: 'static,
-        X::Error: Into<Error>,
+        X::Error: Into<Response<AnyBody>>,
         X::InitError: fmt::Debug,
 
         U: ServiceFactory<
@@ -128,7 +130,7 @@ mod openssl {
             Response = (),
         >,
         U::Future: 'static,
-        U::Error: fmt::Display + Into<Error>,
+        U::Error: fmt::Display + Into<Response<AnyBody>>,
         U::InitError: fmt::Debug,
     {
         /// Create openssl based service
@@ -170,16 +172,16 @@ mod rustls {
     where
         S: ServiceFactory<Request, Config = ()>,
         S::Future: 'static,
-        S::Error: Into<Error>,
+        S::Error: Into<Response<AnyBody>>,
         S::InitError: fmt::Debug,
         S::Response: Into<Response<B>>,
 
         B: MessageBody,
-        B::Error: Into<Error>,
+        B::Error: Into<Box<dyn StdError>>,
 
         X: ServiceFactory<Request, Config = (), Response = Request>,
         X::Future: 'static,
-        X::Error: Into<Error>,
+        X::Error: Into<Response<AnyBody>>,
         X::InitError: fmt::Debug,
 
         U: ServiceFactory<
@@ -188,7 +190,7 @@ mod rustls {
             Response = (),
         >,
         U::Future: 'static,
-        U::Error: fmt::Display + Into<Error>,
+        U::Error: fmt::Display + Into<Response<AnyBody>>,
         U::InitError: fmt::Debug,
     {
         /// Create rustls based service
@@ -217,7 +219,7 @@ mod rustls {
 impl<T, S, B, X, U> H1Service<T, S, B, X, U>
 where
     S: ServiceFactory<Request, Config = ()>,
-    S::Error: Into<Error>,
+    S::Error: Into<Response<AnyBody>>,
     S::Response: Into<Response<B>>,
     S::InitError: fmt::Debug,
     B: MessageBody,
@@ -225,7 +227,7 @@ where
     pub fn expect<X1>(self, expect: X1) -> H1Service<T, S, B, X1, U>
     where
         X1: ServiceFactory<Request, Response = Request>,
-        X1::Error: Into<Error>,
+        X1::Error: Into<Response<AnyBody>>,
         X1::InitError: fmt::Debug,
     {
         H1Service {
@@ -268,21 +270,21 @@ where
 
     S: ServiceFactory<Request, Config = ()>,
     S::Future: 'static,
-    S::Error: Into<Error>,
+    S::Error: Into<Response<AnyBody>>,
     S::Response: Into<Response<B>>,
     S::InitError: fmt::Debug,
 
     B: MessageBody,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 
     X: ServiceFactory<Request, Config = (), Response = Request>,
     X::Future: 'static,
-    X::Error: Into<Error>,
+    X::Error: Into<Response<AnyBody>>,
     X::InitError: fmt::Debug,
 
     U: ServiceFactory<(Request, Framed<T, Codec>), Config = (), Response = ()>,
     U::Future: 'static,
-    U::Error: fmt::Display + Into<Error>,
+    U::Error: fmt::Display + Into<Response<AnyBody>>,
     U::InitError: fmt::Debug,
 {
     type Response = ();
@@ -338,17 +340,17 @@ where
     T: AsyncRead + AsyncWrite + Unpin,
 
     S: Service<Request>,
-    S::Error: Into<Error>,
+    S::Error: Into<Response<AnyBody>>,
     S::Response: Into<Response<B>>,
 
     B: MessageBody,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 
     X: Service<Request, Response = Request>,
-    X::Error: Into<Error>,
+    X::Error: Into<Response<AnyBody>>,
 
     U: Service<(Request, Framed<T, Codec>), Response = ()>,
-    U::Error: fmt::Display + Into<Error>,
+    U::Error: fmt::Display + Into<Response<AnyBody>>,
 {
     type Response = ();
     type Error = DispatchError;

actix-http/src/h1/utils.rs

@@ -81,7 +81,9 @@ where
                                 let _ = this.body.take();
                             }
                             let framed = this.framed.as_mut().as_pin_mut().unwrap();
-                            framed.write(Message::Chunk(item))?;
+                            framed.write(Message::Chunk(item)).map_err(|err| {
+                                Error::new_send_response().with_cause(err)
+                            })?;
                         }
                         Poll::Pending => body_ready = false,
                     }
@@ -92,7 +94,10 @@ where
 
             // flush write buffer
             if !framed.is_write_buf_empty() {
-                match framed.flush(cx)? {
+                match framed
+                    .flush(cx)
+                    .map_err(|err| Error::new_send_response().with_cause(err))?
+                {
                     Poll::Ready(_) => {
                         if body_ready {
                             continue;
@@ -106,7 +111,9 @@ where
 
             // send response
             if let Some(res) = this.res.take() {
-                framed.write(res)?;
+                framed
+                    .write(res)
+                    .map_err(|err| Error::new_send_response().with_cause(err))?;
                 continue;
             }
 

actix-http/src/h2/dispatcher.rs

@@ -1,5 +1,6 @@
 use std::{
     cmp,
+    error::Error as StdError,
     future::Future,
     marker::PhantomData,
     net,
@@ -18,15 +19,12 @@ use http::header::{HeaderValue, CONNECTION, CONTENT_LENGTH, DATE, TRANSFER_ENCOD
 use log::{error, trace};
 use pin_project_lite::pin_project;
 
-use crate::body::{BodySize, MessageBody};
+use crate::{
-use crate::config::ServiceConfig;
+    body::{AnyBody, BodySize, MessageBody},
-use crate::error::Error;
+    config::ServiceConfig,
-use crate::message::ResponseHead;
+    service::HttpFlow,
-use crate::payload::Payload;
+    OnConnectData, Payload, Request, Response, ResponseHead,
-use crate::request::Request;
+};
-use crate::response::Response;
-use crate::service::HttpFlow;
-use crate::OnConnectData;
 
 const CHUNK_SIZE: usize = 16_384;
 
@@ -66,12 +64,12 @@ where
     T: AsyncRead + AsyncWrite + Unpin,
 
     S: Service<Request>,
-    S::Error: Into<Error>,
+    S::Error: Into<Response<AnyBody>>,
     S::Future: 'static,
     S::Response: Into<Response<B>>,
 
     B: MessageBody,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 {
     type Output = Result<(), crate::error::DispatchError>;
 
@@ -106,7 +104,7 @@ where
                 let res = match fut.await {
                     Ok(res) => handle_response(res.into(), tx, config).await,
                     Err(err) => {
-                        let res = Response::from_error(err.into());
+                        let res: Response<AnyBody> = err.into();
                         handle_response(res, tx, config).await
                     }
                 };
@@ -133,7 +131,7 @@ where
 enum DispatchError {
     SendResponse(h2::Error),
     SendData(h2::Error),
-    ResponseBody(Error),
+    ResponseBody(Box<dyn StdError>),
 }
 
 async fn handle_response<B>(
@@ -143,7 +141,7 @@ async fn handle_response<B>(
 ) -> Result<(), DispatchError>
 where
     B: MessageBody,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 {
     let (res, body) = res.replace_body(());
 

actix-http/src/h2/service.rs

@@ -1,8 +1,12 @@
-use std::future::Future;
+use std::{
-use std::marker::PhantomData;
+    error::Error as StdError,
-use std::pin::Pin;
+    future::Future,
-use std::task::{Context, Poll};
+    marker::PhantomData,
-use std::{net, rc::Rc};
+    net,
+    pin::Pin,
+    rc::Rc,
+    task::{Context, Poll},
+};
 
 use actix_codec::{AsyncRead, AsyncWrite};
 use actix_rt::net::TcpStream;
@@ -13,16 +17,16 @@ use actix_service::{
 use actix_utils::future::ready;
 use bytes::Bytes;
 use futures_core::{future::LocalBoxFuture, ready};
-use h2::server::{handshake, Handshake};
+use h2::server::{handshake as h2_handshake, Handshake as H2Handshake};
 use log::error;
 
-use crate::body::MessageBody;
+use crate::{
-use crate::config::ServiceConfig;
+    body::{AnyBody, MessageBody},
-use crate::error::{DispatchError, Error};
+    config::ServiceConfig,
-use crate::request::Request;
+    error::DispatchError,
-use crate::response::Response;
+    service::HttpFlow,
-use crate::service::HttpFlow;
+    ConnectCallback, OnConnectData, Request, Response,
-use crate::{ConnectCallback, OnConnectData};
+};
 
 use super::dispatcher::Dispatcher;
 
@@ -37,12 +41,12 @@ pub struct H2Service<T, S, B> {
 impl<T, S, B> H2Service<T, S, B>
 where
     S: ServiceFactory<Request, Config = ()>,
-    S::Error: Into<Error> + 'static,
+    S::Error: Into<Response<AnyBody>> + 'static,
     S::Response: Into<Response<B>> + 'static,
     <S::Service as Service<Request>>::Future: 'static,
 
     B: MessageBody + 'static,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 {
     /// Create new `H2Service` instance with config.
     pub(crate) fn with_config<F: IntoServiceFactory<S, Request>>(
@@ -68,12 +72,12 @@ impl<S, B> H2Service<TcpStream, S, B>
 where
     S: ServiceFactory<Request, Config = ()>,
     S::Future: 'static,
-    S::Error: Into<Error> + 'static,
+    S::Error: Into<Response<AnyBody>> + 'static,
     S::Response: Into<Response<B>> + 'static,
     <S::Service as Service<Request>>::Future: 'static,
 
     B: MessageBody + 'static,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 {
     /// Create plain TCP based service
     pub fn tcp(
@@ -107,12 +111,12 @@ mod openssl {
     where
         S: ServiceFactory<Request, Config = ()>,
         S::Future: 'static,
-        S::Error: Into<Error> + 'static,
+        S::Error: Into<Response<AnyBody>> + 'static,
         S::Response: Into<Response<B>> + 'static,
         <S::Service as Service<Request>>::Future: 'static,
 
         B: MessageBody + 'static,
-        B::Error: Into<Error>,
+        B::Error: Into<Box<dyn StdError>>,
     {
         /// Create OpenSSL based service
         pub fn openssl(
@@ -153,12 +157,12 @@ mod rustls {
     where
         S: ServiceFactory<Request, Config = ()>,
         S::Future: 'static,
-        S::Error: Into<Error> + 'static,
+        S::Error: Into<Response<AnyBody>> + 'static,
         S::Response: Into<Response<B>> + 'static,
         <S::Service as Service<Request>>::Future: 'static,
 
         B: MessageBody + 'static,
-        B::Error: Into<Error>,
+        B::Error: Into<Box<dyn StdError>>,
     {
         /// Create Rustls based service
         pub fn rustls(
@@ -197,12 +201,12 @@ where
 
     S: ServiceFactory<Request, Config = ()>,
     S::Future: 'static,
-    S::Error: Into<Error> + 'static,
+    S::Error: Into<Response<AnyBody>> + 'static,
     S::Response: Into<Response<B>> + 'static,
     <S::Service as Service<Request>>::Future: 'static,
 
     B: MessageBody + 'static,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 {
     type Response = ();
     type Error = DispatchError;
@@ -237,7 +241,7 @@ where
 impl<T, S, B> H2ServiceHandler<T, S, B>
 where
     S: Service<Request>,
-    S::Error: Into<Error> + 'static,
+    S::Error: Into<Response<AnyBody>> + 'static,
     S::Future: 'static,
     S::Response: Into<Response<B>> + 'static,
     B: MessageBody + 'static,
@@ -260,11 +264,11 @@ impl<T, S, B> Service<(T, Option<net::SocketAddr>)> for H2ServiceHandler<T, S, B
 where
     T: AsyncRead + AsyncWrite + Unpin,
     S: Service<Request>,
-    S::Error: Into<Error> + 'static,
+    S::Error: Into<Response<AnyBody>> + 'static,
     S::Future: 'static,
     S::Response: Into<Response<B>> + 'static,
     B: MessageBody + 'static,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 {
     type Response = ();
     type Error = DispatchError;
@@ -288,7 +292,7 @@ where
                 Some(self.cfg.clone()),
                 addr,
                 on_connect_data,
-                handshake(io),
+                h2_handshake(io),
             ),
         }
     }
@@ -305,7 +309,7 @@ where
         Option<ServiceConfig>,
         Option<net::SocketAddr>,
         OnConnectData,
-        Handshake<T, Bytes>,
+        H2Handshake<T, Bytes>,
     ),
 }
 
@@ -313,7 +317,7 @@ pub struct H2ServiceHandlerResponse<T, S, B>
 where
     T: AsyncRead + AsyncWrite + Unpin,
     S: Service<Request>,
-    S::Error: Into<Error> + 'static,
+    S::Error: Into<Response<AnyBody>> + 'static,
     S::Future: 'static,
     S::Response: Into<Response<B>> + 'static,
     B: MessageBody + 'static,
@@ -325,11 +329,11 @@ impl<T, S, B> Future for H2ServiceHandlerResponse<T, S, B>
 where
     T: AsyncRead + AsyncWrite + Unpin,
     S: Service<Request>,
-    S::Error: Into<Error> + 'static,
+    S::Error: Into<Response<AnyBody>> + 'static,
     S::Future: 'static,
     S::Response: Into<Response<B>> + 'static,
     B: MessageBody,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 {
     type Output = Result<(), DispatchError>;
 

actix-http/src/helpers.rs

@@ -27,7 +27,9 @@ pub(crate) fn write_status_line<B: BufMut>(version: Version, n: u16, buf: &mut B
     buf.put_u8(b' ');
 }
 
-/// NOTE: bytes object has to contain enough space
+/// Write out content length header.
+///
+/// Buffer must to contain enough space or be implicitly extendable.
 pub fn write_content_length<B: BufMut>(n: u64, buf: &mut B) {
     if n == 0 {
         buf.put_slice(b"\r\ncontent-length: 0\r\n");
@@ -41,11 +43,15 @@ pub fn write_content_length<B: BufMut>(n: u64, buf: &mut B) {
     buf.put_slice(b"\r\n");
 }
 
-// TODO: bench why this is needed vs Buf::writer
+/// An `io::Write`r that only requires mutable reference and assumes that there is space available
-/// An `io` writer for a `BufMut` that should only be used once and on an empty buffer.
+/// in the buffer for every write operation or that it can be extended implicitly (like
-pub(crate) struct Writer<'a, B>(pub &'a mut B);
+/// `bytes::BytesMut`, for example).
+///
+/// This is slightly faster (~10%) than `bytes::buf::Writer` in such cases because it does not
+/// perform a remaining length check before writing.
+pub(crate) struct MutWriter<'a, B>(pub(crate) &'a mut B);
 
-impl<'a, B> io::Write for Writer<'a, B>
+impl<'a, B> io::Write for MutWriter<'a, B>
 where
     B: BufMut,
 {

actix-http/src/lib.rs

@@ -54,7 +54,7 @@ pub mod ws;
 
 pub use self::builder::HttpServiceBuilder;
 pub use self::config::{KeepAlive, ServiceConfig};
-pub use self::error::{Error, ResponseError};
+pub use self::error::Error;
 pub use self::extensions::Extensions;
 pub use self::header::ContentEncoding;
 pub use self::http_message::HttpMessage;

actix-http/src/response.rs

@@ -8,7 +8,7 @@ use std::{
 use bytes::{Bytes, BytesMut};
 
 use crate::{
-    body::{Body, MessageBody},
+    body::{AnyBody, MessageBody},
     error::Error,
     extensions::Extensions,
     http::{HeaderMap, StatusCode},
@@ -22,13 +22,13 @@ pub struct Response<B> {
     pub(crate) body: B,
 }
 
-impl Response<Body> {
+impl Response<AnyBody> {
     /// Constructs a new response with default body.
     #[inline]
-    pub fn new(status: StatusCode) -> Response<Body> {
+    pub fn new(status: StatusCode) -> Self {
         Response {
             head: BoxedResponseHead::new(status),
-            body: Body::Empty,
+            body: AnyBody::Empty,
         }
     }
 
@@ -43,40 +43,29 @@ impl Response<Body> {
 
     /// Constructs a new response with status 200 OK.
     #[inline]
-    pub fn ok() -> Response<Body> {
+    pub fn ok() -> Self {
         Response::new(StatusCode::OK)
     }
 
     /// Constructs a new response with status 400 Bad Request.
     #[inline]
-    pub fn bad_request() -> Response<Body> {
+    pub fn bad_request() -> Self {
         Response::new(StatusCode::BAD_REQUEST)
     }
 
     /// Constructs a new response with status 404 Not Found.
     #[inline]
-    pub fn not_found() -> Response<Body> {
+    pub fn not_found() -> Self {
         Response::new(StatusCode::NOT_FOUND)
     }
 
     /// Constructs a new response with status 500 Internal Server Error.
     #[inline]
-    pub fn internal_server_error() -> Response<Body> {
+    pub fn internal_server_error() -> Self {
         Response::new(StatusCode::INTERNAL_SERVER_ERROR)
     }
 
     // end shortcuts
-
-    /// Constructs a new response from an error.
-    #[inline]
-    pub fn from_error(error: impl Into<Error>) -> Response<Body> {
-        let error = error.into();
-        let resp = error.as_response_error().error_response();
-        if resp.head.status == StatusCode::INTERNAL_SERVER_ERROR {
-            debug!("Internal Server Error: {:?}", error);
-        }
-        resp
-    }
 }
 
 impl<B> Response<B> {
@@ -209,7 +198,6 @@ impl<B> Response<B> {
 impl<B> fmt::Debug for Response<B>
 where
     B: MessageBody,
-    B::Error: Into<Error>,
 {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let res = writeln!(
@@ -235,7 +223,9 @@ impl<B: Default> Default for Response<B> {
     }
 }
 
-impl<I: Into<Response<Body>>, E: Into<Error>> From<Result<I, E>> for Response<Body> {
+impl<I: Into<Response<AnyBody>>, E: Into<Error>> From<Result<I, E>>
+    for Response<AnyBody>
+{
     fn from(res: Result<I, E>) -> Self {
         match res {
             Ok(val) => val.into(),
@@ -244,13 +234,19 @@ impl<I: Into<Response<Body>>, E: Into<Error>> From<Result<I, E>> for Response<Bo
     }
 }
 
-impl From<ResponseBuilder> for Response<Body> {
+impl From<ResponseBuilder> for Response<AnyBody> {
     fn from(mut builder: ResponseBuilder) -> Self {
         builder.finish()
     }
 }
 
-impl From<&'static str> for Response<Body> {
+impl From<std::convert::Infallible> for Response<AnyBody> {
+    fn from(val: std::convert::Infallible) -> Self {
+        match val {}
+    }
+}
+
+impl From<&'static str> for Response<AnyBody> {
     fn from(val: &'static str) -> Self {
         Response::build(StatusCode::OK)
             .content_type(mime::TEXT_PLAIN_UTF_8)
@@ -258,7 +254,7 @@ impl From<&'static str> for Response<Body> {
     }
 }
 
-impl From<&'static [u8]> for Response<Body> {
+impl From<&'static [u8]> for Response<AnyBody> {
     fn from(val: &'static [u8]) -> Self {
         Response::build(StatusCode::OK)
             .content_type(mime::APPLICATION_OCTET_STREAM)
@@ -266,7 +262,7 @@ impl From<&'static [u8]> for Response<Body> {
     }
 }
 
-impl From<String> for Response<Body> {
+impl From<String> for Response<AnyBody> {
     fn from(val: String) -> Self {
         Response::build(StatusCode::OK)
             .content_type(mime::TEXT_PLAIN_UTF_8)
@@ -274,7 +270,7 @@ impl From<String> for Response<Body> {
     }
 }
 
-impl<'a> From<&'a String> for Response<Body> {
+impl<'a> From<&'a String> for Response<AnyBody> {
     fn from(val: &'a String) -> Self {
         Response::build(StatusCode::OK)
             .content_type(mime::TEXT_PLAIN_UTF_8)
@@ -282,7 +278,7 @@ impl<'a> From<&'a String> for Response<Body> {
     }
 }
 
-impl From<Bytes> for Response<Body> {
+impl From<Bytes> for Response<AnyBody> {
     fn from(val: Bytes) -> Self {
         Response::build(StatusCode::OK)
             .content_type(mime::APPLICATION_OCTET_STREAM)
@@ -290,7 +286,7 @@ impl From<Bytes> for Response<Body> {
     }
 }
 
-impl From<BytesMut> for Response<Body> {
+impl From<BytesMut> for Response<AnyBody> {
     fn from(val: BytesMut) -> Self {
         Response::build(StatusCode::OK)
             .content_type(mime::APPLICATION_OCTET_STREAM)
@@ -301,7 +297,6 @@ impl From<BytesMut> for Response<Body> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::body::Body;
     use crate::http::header::{HeaderValue, CONTENT_TYPE, COOKIE};
 
     #[test]
@@ -316,7 +311,7 @@ mod tests {
 
     #[test]
     fn test_into_response() {
-        let resp: Response<Body> = "test".into();
+        let resp: Response<AnyBody> = "test".into();
         assert_eq!(resp.status(), StatusCode::OK);
         assert_eq!(
             resp.headers().get(CONTENT_TYPE).unwrap(),
@@ -325,7 +320,7 @@ mod tests {
         assert_eq!(resp.status(), StatusCode::OK);
         assert_eq!(resp.body().get_ref(), b"test");
 
-        let resp: Response<Body> = b"test".as_ref().into();
+        let resp: Response<AnyBody> = b"test".as_ref().into();
         assert_eq!(resp.status(), StatusCode::OK);
         assert_eq!(
             resp.headers().get(CONTENT_TYPE).unwrap(),
@@ -334,7 +329,7 @@ mod tests {
         assert_eq!(resp.status(), StatusCode::OK);
         assert_eq!(resp.body().get_ref(), b"test");
 
-        let resp: Response<Body> = "test".to_owned().into();
+        let resp: Response<AnyBody> = "test".to_owned().into();
         assert_eq!(resp.status(), StatusCode::OK);
         assert_eq!(
             resp.headers().get(CONTENT_TYPE).unwrap(),
@@ -343,7 +338,7 @@ mod tests {
         assert_eq!(resp.status(), StatusCode::OK);
         assert_eq!(resp.body().get_ref(), b"test");
 
-        let resp: Response<Body> = (&"test".to_owned()).into();
+        let resp: Response<AnyBody> = (&"test".to_owned()).into();
         assert_eq!(resp.status(), StatusCode::OK);
         assert_eq!(
             resp.headers().get(CONTENT_TYPE).unwrap(),
@@ -353,7 +348,7 @@ mod tests {
         assert_eq!(resp.body().get_ref(), b"test");
 
         let b = Bytes::from_static(b"test");
-        let resp: Response<Body> = b.into();
+        let resp: Response<AnyBody> = b.into();
         assert_eq!(resp.status(), StatusCode::OK);
         assert_eq!(
             resp.headers().get(CONTENT_TYPE).unwrap(),
@@ -363,7 +358,7 @@ mod tests {
         assert_eq!(resp.body().get_ref(), b"test");
 
         let b = Bytes::from_static(b"test");
-        let resp: Response<Body> = b.into();
+        let resp: Response<AnyBody> = b.into();
         assert_eq!(resp.status(), StatusCode::OK);
         assert_eq!(
             resp.headers().get(CONTENT_TYPE).unwrap(),
@@ -373,7 +368,7 @@ mod tests {
         assert_eq!(resp.body().get_ref(), b"test");
 
         let b = BytesMut::from("test");
-        let resp: Response<Body> = b.into();
+        let resp: Response<AnyBody> = b.into();
         assert_eq!(resp.status(), StatusCode::OK);
         assert_eq!(
             resp.headers().get(CONTENT_TYPE).unwrap(),

actix-http/src/response_builder.rs

@@ -2,6 +2,7 @@
 
 use std::{
     cell::{Ref, RefMut},
+    error::Error as StdError,
     fmt,
     future::Future,
     pin::Pin,
@@ -13,7 +14,7 @@ use bytes::Bytes;
 use futures_core::Stream;
 
 use crate::{
-    body::{Body, BodyStream},
+    body::{AnyBody, BodyStream},
     error::{Error, HttpError},
     header::{self, IntoHeaderPair, IntoHeaderValue},
     message::{BoxedResponseHead, ConnectionType, ResponseHead},
@@ -235,9 +236,9 @@ impl ResponseBuilder {
     ///
     /// This `ResponseBuilder` will be left in a useless state.
     #[inline]
-    pub fn body<B: Into<Body>>(&mut self, body: B) -> Response<Body> {
+    pub fn body<B: Into<AnyBody>>(&mut self, body: B) -> Response<AnyBody> {
         self.message_body(body.into())
-            .unwrap_or_else(Response::from_error)
+            .unwrap_or_else(Response::from)
     }
 
     /// Generate response with a body.
@@ -245,7 +246,7 @@ impl ResponseBuilder {
     /// This `ResponseBuilder` will be left in a useless state.
     pub fn message_body<B>(&mut self, body: B) -> Result<Response<B>, Error> {
         if let Some(err) = self.err.take() {
-            return Err(err.into());
+            return Err(Error::new_http().with_cause(err));
         }
 
         let head = self.head.take().expect("cannot reuse response builder");
@@ -256,20 +257,20 @@ impl ResponseBuilder {
     ///
     /// This `ResponseBuilder` will be left in a useless state.
     #[inline]
-    pub fn streaming<S, E>(&mut self, stream: S) -> Response<Body>
+    pub fn streaming<S, E>(&mut self, stream: S) -> Response<AnyBody>
     where
-        S: Stream<Item = Result<Bytes, E>> + Unpin + 'static,
+        S: Stream<Item = Result<Bytes, E>> + 'static,
-        E: Into<Error> + 'static,
+        E: Into<Box<dyn StdError>> + 'static,
     {
-        self.body(Body::from_message(BodyStream::new(stream)))
+        self.body(AnyBody::from_message(BodyStream::new(stream)))
     }
 
     /// Generate response with an empty body.
     ///
     /// This `ResponseBuilder` will be left in a useless state.
     #[inline]
-    pub fn finish(&mut self) -> Response<Body> {
+    pub fn finish(&mut self) -> Response<AnyBody> {
-        self.body(Body::Empty)
+        self.body(AnyBody::Empty)
     }
 
     /// Create an owned `ResponseBuilder`, leaving the original in a useless state.
@@ -327,7 +328,7 @@ impl<'a> From<&'a ResponseHead> for ResponseBuilder {
 }
 
 impl Future for ResponseBuilder {
-    type Output = Result<Response<Body>, Error>;
+    type Output = Result<Response<AnyBody>, Error>;
 
     fn poll(mut self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Self::Output> {
         Poll::Ready(Ok(self.finish()))

actix-http/src/service.rs

@@ -1,4 +1,5 @@
 use std::{
+    error::Error as StdError,
     fmt,
     future::Future,
     marker::PhantomData,
@@ -8,6 +9,7 @@ use std::{
     task::{Context, Poll},
 };
 
+use ::h2::server::{handshake as h2_handshake, Handshake as H2Handshake};
 use actix_codec::{AsyncRead, AsyncWrite, Framed};
 use actix_rt::net::TcpStream;
 use actix_service::{
@@ -15,16 +17,15 @@ use actix_service::{
 };
 use bytes::Bytes;
 use futures_core::{future::LocalBoxFuture, ready};
-use h2::server::{handshake, Handshake};
 use pin_project::pin_project;
 
-use crate::body::MessageBody;
+use crate::{
-use crate::builder::HttpServiceBuilder;
+    body::{AnyBody, MessageBody},
-use crate::config::{KeepAlive, ServiceConfig};
+    builder::HttpServiceBuilder,
-use crate::error::{DispatchError, Error};
+    config::{KeepAlive, ServiceConfig},
-use crate::request::Request;
+    error::DispatchError,
-use crate::response::Response;
+    h1, h2, ConnectCallback, OnConnectData, Protocol, Request, Response,
-use crate::{h1, h2::Dispatcher, ConnectCallback, OnConnectData, Protocol};
+};
 
 /// A `ServiceFactory` for HTTP/1.1 or HTTP/2 protocol.
 pub struct HttpService<T, S, B, X = h1::ExpectHandler, U = h1::UpgradeHandler> {
@@ -39,7 +40,7 @@ pub struct HttpService<T, S, B, X = h1::ExpectHandler, U = h1::UpgradeHandler> {
 impl<T, S, B> HttpService<T, S, B>
 where
     S: ServiceFactory<Request, Config = ()>,
-    S::Error: Into<Error> + 'static,
+    S::Error: Into<Response<AnyBody>> + 'static,
     S::InitError: fmt::Debug,
     S::Response: Into<Response<B>> + 'static,
     <S::Service as Service<Request>>::Future: 'static,
@@ -54,12 +55,12 @@ where
 impl<T, S, B> HttpService<T, S, B>
 where
     S: ServiceFactory<Request, Config = ()>,
-    S::Error: Into<Error> + 'static,
+    S::Error: Into<Response<AnyBody>> + 'static,
     S::InitError: fmt::Debug,
     S::Response: Into<Response<B>> + 'static,
     <S::Service as Service<Request>>::Future: 'static,
     B: MessageBody + 'static,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 {
     /// Create new `HttpService` instance.
     pub fn new<F: IntoServiceFactory<S, Request>>(service: F) -> Self {
@@ -94,7 +95,7 @@ where
 impl<T, S, B, X, U> HttpService<T, S, B, X, U>
 where
     S: ServiceFactory<Request, Config = ()>,
-    S::Error: Into<Error> + 'static,
+    S::Error: Into<Response<AnyBody>> + 'static,
     S::InitError: fmt::Debug,
     S::Response: Into<Response<B>> + 'static,
     <S::Service as Service<Request>>::Future: 'static,
@@ -108,7 +109,7 @@ where
     pub fn expect<X1>(self, expect: X1) -> HttpService<T, S, B, X1, U>
     where
         X1: ServiceFactory<Request, Config = (), Response = Request>,
-        X1::Error: Into<Error>,
+        X1::Error: Into<Response<AnyBody>>,
         X1::InitError: fmt::Debug,
     {
         HttpService {
@@ -152,17 +153,17 @@ impl<S, B, X, U> HttpService<TcpStream, S, B, X, U>
 where
     S: ServiceFactory<Request, Config = ()>,
     S::Future: 'static,
-    S::Error: Into<Error> + 'static,
+    S::Error: Into<Response<AnyBody>> + 'static,
     S::InitError: fmt::Debug,
     S::Response: Into<Response<B>> + 'static,
     <S::Service as Service<Request>>::Future: 'static,
 
     B: MessageBody + 'static,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 
     X: ServiceFactory<Request, Config = (), Response = Request>,
     X::Future: 'static,
-    X::Error: Into<Error>,
+    X::Error: Into<Response<AnyBody>>,
     X::InitError: fmt::Debug,
 
     U: ServiceFactory<
@@ -171,7 +172,7 @@ where
         Response = (),
     >,
     U::Future: 'static,
-    U::Error: fmt::Display + Into<Error>,
+    U::Error: fmt::Display + Into<Response<AnyBody>>,
     U::InitError: fmt::Debug,
 {
     /// Create simple tcp stream service
@@ -204,17 +205,17 @@ mod openssl {
     where
         S: ServiceFactory<Request, Config = ()>,
         S::Future: 'static,
-        S::Error: Into<Error> + 'static,
+        S::Error: Into<Response<AnyBody>> + 'static,
         S::InitError: fmt::Debug,
         S::Response: Into<Response<B>> + 'static,
         <S::Service as Service<Request>>::Future: 'static,
 
         B: MessageBody + 'static,
-        B::Error: Into<Error>,
+        B::Error: Into<Box<dyn StdError>>,
 
         X: ServiceFactory<Request, Config = (), Response = Request>,
         X::Future: 'static,
-        X::Error: Into<Error>,
+        X::Error: Into<Response<AnyBody>>,
         X::InitError: fmt::Debug,
 
         U: ServiceFactory<
@@ -223,7 +224,7 @@ mod openssl {
             Response = (),
         >,
         U::Future: 'static,
-        U::Error: fmt::Display + Into<Error>,
+        U::Error: fmt::Display + Into<Response<AnyBody>>,
         U::InitError: fmt::Debug,
     {
         /// Create openssl based service
@@ -272,17 +273,17 @@ mod rustls {
     where
         S: ServiceFactory<Request, Config = ()>,
         S::Future: 'static,
-        S::Error: Into<Error> + 'static,
+        S::Error: Into<Response<AnyBody>> + 'static,
         S::InitError: fmt::Debug,
         S::Response: Into<Response<B>> + 'static,
         <S::Service as Service<Request>>::Future: 'static,
 
         B: MessageBody + 'static,
-        B::Error: Into<Error>,
+        B::Error: Into<Box<dyn StdError>>,
 
         X: ServiceFactory<Request, Config = (), Response = Request>,
         X::Future: 'static,
-        X::Error: Into<Error>,
+        X::Error: Into<Response<AnyBody>>,
         X::InitError: fmt::Debug,
 
         U: ServiceFactory<
@@ -291,7 +292,7 @@ mod rustls {
             Response = (),
         >,
         U::Future: 'static,
-        U::Error: fmt::Display + Into<Error>,
+        U::Error: fmt::Display + Into<Response<AnyBody>>,
         U::InitError: fmt::Debug,
     {
         /// Create rustls based service
@@ -338,22 +339,22 @@ where
 
     S: ServiceFactory<Request, Config = ()>,
     S::Future: 'static,
-    S::Error: Into<Error> + 'static,
+    S::Error: Into<Response<AnyBody>> + 'static,
     S::InitError: fmt::Debug,
     S::Response: Into<Response<B>> + 'static,
     <S::Service as Service<Request>>::Future: 'static,
 
     B: MessageBody + 'static,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 
     X: ServiceFactory<Request, Config = (), Response = Request>,
     X::Future: 'static,
-    X::Error: Into<Error>,
+    X::Error: Into<Response<AnyBody>>,
     X::InitError: fmt::Debug,
 
     U: ServiceFactory<(Request, Framed<T, h1::Codec>), Config = (), Response = ()>,
     U::Future: 'static,
-    U::Error: fmt::Display + Into<Error>,
+    U::Error: fmt::Display + Into<Response<AnyBody>>,
     U::InitError: fmt::Debug,
 {
     type Response = ();
@@ -416,11 +417,11 @@ where
 impl<T, S, B, X, U> HttpServiceHandler<T, S, B, X, U>
 where
     S: Service<Request>,
-    S::Error: Into<Error>,
+    S::Error: Into<Response<AnyBody>>,
     X: Service<Request>,
-    X::Error: Into<Error>,
+    X::Error: Into<Response<AnyBody>>,
     U: Service<(Request, Framed<T, h1::Codec>)>,
-    U::Error: Into<Error>,
+    U::Error: Into<Response<AnyBody>>,
 {
     pub(super) fn new(
         cfg: ServiceConfig,
@@ -437,7 +438,10 @@ where
         }
     }
 
-    pub(super) fn _poll_ready(&self, cx: &mut Context<'_>) -> Poll<Result<(), Error>> {
+    pub(super) fn _poll_ready(
+        &self,
+        cx: &mut Context<'_>,
+    ) -> Poll<Result<(), Response<AnyBody>>> {
         ready!(self.flow.expect.poll_ready(cx).map_err(Into::into))?;
 
         ready!(self.flow.service.poll_ready(cx).map_err(Into::into))?;
@@ -473,18 +477,18 @@ where
     T: AsyncRead + AsyncWrite + Unpin,
 
     S: Service<Request>,
-    S::Error: Into<Error> + 'static,
+    S::Error: Into<Response<AnyBody>> + 'static,
     S::Future: 'static,
     S::Response: Into<Response<B>> + 'static,
 
     B: MessageBody + 'static,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 
     X: Service<Request, Response = Request>,
-    X::Error: Into<Error>,
+    X::Error: Into<Response<AnyBody>>,
 
     U: Service<(Request, Framed<T, h1::Codec>), Response = ()>,
-    U::Error: fmt::Display + Into<Error>,
+    U::Error: fmt::Display + Into<Response<AnyBody>>,
 {
     type Response = ();
     type Error = DispatchError;
@@ -507,7 +511,7 @@ where
         match proto {
             Protocol::Http2 => HttpServiceHandlerResponse {
                 state: State::H2Handshake(Some((
-                    handshake(io),
+                    h2_handshake(io),
                     self.cfg.clone(),
                     self.flow.clone(),
                     on_connect_data,
@@ -537,22 +541,22 @@ where
 
     S: Service<Request>,
     S::Future: 'static,
-    S::Error: Into<Error>,
+    S::Error: Into<Response<AnyBody>>,
 
     B: MessageBody,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 
     X: Service<Request, Response = Request>,
-    X::Error: Into<Error>,
+    X::Error: Into<Response<AnyBody>>,
 
     U: Service<(Request, Framed<T, h1::Codec>), Response = ()>,
     U::Error: fmt::Display,
 {
     H1(#[pin] h1::Dispatcher<T, S, B, X, U>),
-    H2(#[pin] Dispatcher<T, S, B, X, U>),
+    H2(#[pin] h2::Dispatcher<T, S, B, X, U>),
     H2Handshake(
         Option<(
-            Handshake<T, Bytes>,
+            H2Handshake<T, Bytes>,
             ServiceConfig,
             Rc<HttpFlow<S, X, U>>,
             OnConnectData,
@@ -567,15 +571,15 @@ where
     T: AsyncRead + AsyncWrite + Unpin,
 
     S: Service<Request>,
-    S::Error: Into<Error> + 'static,
+    S::Error: Into<Response<AnyBody>> + 'static,
     S::Future: 'static,
     S::Response: Into<Response<B>> + 'static,
 
     B: MessageBody,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 
     X: Service<Request, Response = Request>,
-    X::Error: Into<Error>,
+    X::Error: Into<Response<AnyBody>>,
 
     U: Service<(Request, Framed<T, h1::Codec>), Response = ()>,
     U::Error: fmt::Display,
@@ -589,15 +593,15 @@ where
     T: AsyncRead + AsyncWrite + Unpin,
 
     S: Service<Request>,
-    S::Error: Into<Error> + 'static,
+    S::Error: Into<Response<AnyBody>> + 'static,
     S::Future: 'static,
     S::Response: Into<Response<B>> + 'static,
 
     B: MessageBody + 'static,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 
     X: Service<Request, Response = Request>,
-    X::Error: Into<Error>,
+    X::Error: Into<Response<AnyBody>>,
 
     U: Service<(Request, Framed<T, h1::Codec>), Response = ()>,
     U::Error: fmt::Display,
@@ -613,13 +617,15 @@ where
                     Ok(conn) => {
                         let (_, cfg, srv, on_connect_data, peer_addr) =
                             data.take().unwrap();
-                        self.as_mut().project().state.set(State::H2(Dispatcher::new(
+                        self.as_mut().project().state.set(State::H2(
-                            srv,
+                            h2::Dispatcher::new(
-                            conn,
+                                srv,
-                            on_connect_data,
+                                conn,
-                            cfg,
+                                on_connect_data,
-                            peer_addr,
+                                cfg,
-                        )));
+                                peer_addr,
+                            ),
+                        ));
                         self.poll(cx)
                     }
                     Err(err) => {

actix-http/src/ws/dispatcher.rs

@@ -72,7 +72,7 @@ mod inner {
 
     use actix_codec::{AsyncRead, AsyncWrite, Decoder, Encoder, Framed};
 
-    use crate::ResponseError;
+    use crate::{body::AnyBody, Response};
 
     /// Framed transport errors
     pub enum DispatcherError<E, U, I>
@@ -136,13 +136,16 @@ mod inner {
         }
     }
 
-    impl<E, U, I> ResponseError for DispatcherError<E, U, I>
+    impl<E, U, I> From<DispatcherError<E, U, I>> for Response<AnyBody>
     where
         E: fmt::Debug + fmt::Display,
         U: Encoder<I> + Decoder,
         <U as Encoder<I>>::Error: fmt::Debug,
         <U as Decoder>::Error: fmt::Debug,
     {
+        fn from(err: DispatcherError<E, U, I>) -> Self {
+            Response::internal_server_error().set_body(AnyBody::from(err.to_string()))
+        }
     }
 
     /// Message type wrapper for signalling end of message stream.

actix-http/src/ws/mod.rs

@@ -9,8 +9,8 @@ use derive_more::{Display, Error, From};
 use http::{header, Method, StatusCode};
 
 use crate::{
-    body::Body, error::ResponseError, header::HeaderValue, message::RequestHead,
+    body::AnyBody, header::HeaderValue, message::RequestHead, response::Response,
-    response::Response, ResponseBuilder,
+    ResponseBuilder,
 };
 
 mod codec;
@@ -25,7 +25,7 @@ pub use self::frame::Parser;
 pub use self::proto::{hash_key, CloseCode, CloseReason, OpCode};
 
 /// WebSocket protocol errors.
-#[derive(Debug, Display, From, Error)]
+#[derive(Debug, Display, Error, From)]
 pub enum ProtocolError {
     /// Received an unmasked frame from client.
     #[display(fmt = "Received an unmasked frame from client.")]
@@ -68,10 +68,8 @@ pub enum ProtocolError {
     Io(io::Error),
 }
 
-impl ResponseError for ProtocolError {}
-
 /// WebSocket handshake errors
-#[derive(PartialEq, Debug, Display)]
+#[derive(Debug, PartialEq, Display, Error)]
 pub enum HandshakeError {
     /// Only get method is allowed.
     #[display(fmt = "Method not allowed.")]
@@ -98,44 +96,55 @@ pub enum HandshakeError {
     BadWebsocketKey,
 }
 
-impl ResponseError for HandshakeError {
+impl From<&HandshakeError> for Response<AnyBody> {
-    fn error_response(&self) -> Response<Body> {
+    fn from(err: &HandshakeError) -> Self {
-        match self {
+        match err {
             HandshakeError::GetMethodRequired => {
-                Response::build(StatusCode::METHOD_NOT_ALLOWED)
+                let mut res = Response::new(StatusCode::METHOD_NOT_ALLOWED);
-                    .insert_header((header::ALLOW, "GET"))
+                res.headers_mut()
-                    .finish()
+                    .insert(header::ALLOW, HeaderValue::from_static("GET"));
+                res
             }
 
             HandshakeError::NoWebsocketUpgrade => {
-                Response::build(StatusCode::BAD_REQUEST)
+                let mut res = Response::bad_request();
-                    .reason("No WebSocket Upgrade header found")
+                res.head_mut().reason = Some("No WebSocket Upgrade header found");
-                    .finish()
+                res
             }
 
             HandshakeError::NoConnectionUpgrade => {
-                Response::build(StatusCode::BAD_REQUEST)
+                let mut res = Response::bad_request();
-                    .reason("No Connection upgrade")
+                res.head_mut().reason = Some("No Connection upgrade");
-                    .finish()
+                res
             }
 
-            HandshakeError::NoVersionHeader => Response::build(StatusCode::BAD_REQUEST)
+            HandshakeError::NoVersionHeader => {
-                .reason("WebSocket version header is required")
+                let mut res = Response::bad_request();
-                .finish(),
+                res.head_mut().reason = Some("WebSocket version header is required");
+                res
+            }
 
             HandshakeError::UnsupportedVersion => {
-                Response::build(StatusCode::BAD_REQUEST)
+                let mut res = Response::bad_request();
-                    .reason("Unsupported WebSocket version")
+                res.head_mut().reason = Some("Unsupported WebSocket version");
-                    .finish()
+                res
             }
 
-            HandshakeError::BadWebsocketKey => Response::build(StatusCode::BAD_REQUEST)
+            HandshakeError::BadWebsocketKey => {
-                .reason("Handshake error")
+                let mut res = Response::bad_request();
-                .finish(),
+                res.head_mut().reason = Some("Handshake error");
+                res
+            }
         }
     }
 }
 
+impl From<HandshakeError> for Response<AnyBody> {
+    fn from(err: HandshakeError) -> Self {
+        (&err).into()
+    }
+}
+
 /// Verify WebSocket handshake request and create handshake response.
 pub fn handshake(req: &RequestHead) -> Result<ResponseBuilder, HandshakeError> {
     verify_handshake(req)?;
@@ -213,7 +222,7 @@ pub fn handshake_response(req: &RequestHead) -> ResponseBuilder {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::test::TestRequest;
+    use crate::{body::AnyBody, test::TestRequest};
     use http::{header, Method};
 
     #[test]
@@ -327,18 +336,18 @@ mod tests {
     }
 
     #[test]
-    fn test_wserror_http_response() {
+    fn test_ws_error_http_response() {
-        let resp = HandshakeError::GetMethodRequired.error_response();
+        let resp: Response<AnyBody> = HandshakeError::GetMethodRequired.into();
         assert_eq!(resp.status(), StatusCode::METHOD_NOT_ALLOWED);
-        let resp = HandshakeError::NoWebsocketUpgrade.error_response();
+        let resp: Response<AnyBody> = HandshakeError::NoWebsocketUpgrade.into();
         assert_eq!(resp.status(), StatusCode::BAD_REQUEST);
-        let resp = HandshakeError::NoConnectionUpgrade.error_response();
+        let resp: Response<AnyBody> = HandshakeError::NoConnectionUpgrade.into();
         assert_eq!(resp.status(), StatusCode::BAD_REQUEST);
-        let resp = HandshakeError::NoVersionHeader.error_response();
+        let resp: Response<AnyBody> = HandshakeError::NoVersionHeader.into();
         assert_eq!(resp.status(), StatusCode::BAD_REQUEST);
-        let resp = HandshakeError::UnsupportedVersion.error_response();
+        let resp: Response<AnyBody> = HandshakeError::UnsupportedVersion.into();
         assert_eq!(resp.status(), StatusCode::BAD_REQUEST);
-        let resp = HandshakeError::BadWebsocketKey.error_response();
+        let resp: Response<AnyBody> = HandshakeError::BadWebsocketKey.into();
         assert_eq!(resp.status(), StatusCode::BAD_REQUEST);
     }
 }

actix-http/tests/test_client.rs

@@ -1,5 +1,7 @@
+use std::convert::Infallible;
+
 use actix_http::{
-    http, http::StatusCode, HttpMessage, HttpService, Request, Response, ResponseError,
+    body::AnyBody, http, http::StatusCode, HttpMessage, HttpService, Request, Response,
 };
 use actix_http_test::test_server;
 use actix_service::ServiceFactoryExt;
@@ -34,7 +36,7 @@ const STR: &str = "Hello World Hello World Hello World Hello World Hello World \
 async fn test_h1_v2() {
     let srv = test_server(move || {
         HttpService::build()
-            .finish(|_| future::ok::<_, ()>(Response::ok().set_body(STR)))
+            .finish(|_| future::ok::<_, Infallible>(Response::ok().set_body(STR)))
             .tcp()
     })
     .await;
@@ -62,7 +64,7 @@ async fn test_h1_v2() {
 async fn test_connection_close() {
     let srv = test_server(move || {
         HttpService::build()
-            .finish(|_| future::ok::<_, ()>(Response::ok().set_body(STR)))
+            .finish(|_| future::ok::<_, Infallible>(Response::ok().set_body(STR)))
             .tcp()
             .map(|_| ())
     })
@@ -76,11 +78,11 @@ async fn test_connection_close() {
 async fn test_with_query_parameter() {
     let srv = test_server(move || {
         HttpService::build()
-            .finish(|req: Request| {
+            .finish(|req: Request| async move {
                 if req.uri().query().unwrap().contains("qp=") {
-                    future::ok::<_, ()>(Response::ok())
+                    Ok::<_, Infallible>(Response::ok())
                 } else {
-                    future::ok::<_, ()>(Response::bad_request())
+                    Ok(Response::bad_request())
                 }
             })
             .tcp()
@@ -97,9 +99,9 @@ async fn test_with_query_parameter() {
 #[display(fmt = "expect failed")]
 struct ExpectFailed;
 
-impl ResponseError for ExpectFailed {
+impl From<ExpectFailed> for Response<AnyBody> {
-    fn status_code(&self) -> StatusCode {
+    fn from(_: ExpectFailed) -> Self {
-        StatusCode::EXPECTATION_FAILED
+        Response::new(StatusCode::EXPECTATION_FAILED)
     }
 }
 
@@ -123,7 +125,7 @@ async fn test_h1_expect() {
                 let str = std::str::from_utf8(&buf).unwrap();
                 assert_eq!(str, "expect body");
 
-                Ok::<_, ()>(Response::ok())
+                Ok::<_, Infallible>(Response::ok())
             })
             .tcp()
     })

actix-http/tests/test_openssl.rs

@@ -2,16 +2,16 @@
 
 extern crate tls_openssl as openssl;
 
-use std::io;
+use std::{convert::Infallible, io};
 
 use actix_http::{
-    body::{Body, SizedStream},
+    body::{AnyBody, Body, SizedStream},
     error::PayloadError,
     http::{
         header::{self, HeaderName, HeaderValue},
         Method, StatusCode, Version,
     },
-    Error, HttpMessage, HttpService, Request, Response, ResponseError,
+    Error, HttpMessage, HttpService, Request, Response,
 };
 use actix_http_test::test_server;
 use actix_service::{fn_service, ServiceFactoryExt};
@@ -136,7 +136,7 @@ async fn test_h2_content_length() {
                     StatusCode::OK,
                     StatusCode::NOT_FOUND,
                 ];
-                ok::<_, ()>(Response::new(statuses[idx]))
+                ok::<_, Infallible>(Response::new(statuses[idx]))
             })
             .openssl(tls_config())
             .map_err(|_| ())
@@ -206,7 +206,7 @@ async fn test_h2_headers() {
                         TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST ",
                 ));
             }
-            ok::<_, ()>(builder.body(data.clone()))
+            ok::<_, Infallible>(builder.body(data.clone()))
         })
             .openssl(tls_config())
                     .map_err(|_| ())
@@ -246,7 +246,7 @@ const STR: &str = "Hello World Hello World Hello World Hello World Hello World \
 async fn test_h2_body2() {
     let mut srv = test_server(move || {
         HttpService::build()
-            .h2(|_| ok::<_, ()>(Response::ok().set_body(STR)))
+            .h2(|_| ok::<_, Infallible>(Response::ok().set_body(STR)))
             .openssl(tls_config())
             .map_err(|_| ())
     })
@@ -264,7 +264,7 @@ async fn test_h2_body2() {
 async fn test_h2_head_empty() {
     let mut srv = test_server(move || {
         HttpService::build()
-            .finish(|_| ok::<_, ()>(Response::ok().set_body(STR)))
+            .finish(|_| ok::<_, Infallible>(Response::ok().set_body(STR)))
             .openssl(tls_config())
             .map_err(|_| ())
     })
@@ -288,7 +288,7 @@ async fn test_h2_head_empty() {
 async fn test_h2_head_binary() {
     let mut srv = test_server(move || {
         HttpService::build()
-            .h2(|_| ok::<_, ()>(Response::ok().set_body(STR)))
+            .h2(|_| ok::<_, Infallible>(Response::ok().set_body(STR)))
             .openssl(tls_config())
             .map_err(|_| ())
     })
@@ -311,7 +311,7 @@ async fn test_h2_head_binary() {
 async fn test_h2_head_binary2() {
     let srv = test_server(move || {
         HttpService::build()
-            .h2(|_| ok::<_, ()>(Response::ok().set_body(STR)))
+            .h2(|_| ok::<_, Infallible>(Response::ok().set_body(STR)))
             .openssl(tls_config())
             .map_err(|_| ())
     })
@@ -330,9 +330,12 @@ async fn test_h2_head_binary2() {
 async fn test_h2_body_length() {
     let mut srv = test_server(move || {
         HttpService::build()
-            .h2(|_| {
+            .h2(|_| async {
-                let body = once(ok(Bytes::from_static(STR.as_ref())));
+                let body = once(async {
-                ok::<_, ()>(
+                    Ok::<_, Infallible>(Bytes::from_static(STR.as_ref()))
+                });
+
+                Ok::<_, Infallible>(
                     Response::ok().set_body(SizedStream::new(STR.len() as u64, body)),
                 )
             })
@@ -355,7 +358,7 @@ async fn test_h2_body_chunked_explicit() {
         HttpService::build()
             .h2(|_| {
                 let body = once(ok::<_, Error>(Bytes::from_static(STR.as_ref())));
-                ok::<_, ()>(
+                ok::<_, Infallible>(
                     Response::build(StatusCode::OK)
                         .insert_header((header::TRANSFER_ENCODING, "chunked"))
                         .streaming(body),
@@ -383,7 +386,7 @@ async fn test_h2_response_http_error_handling() {
         HttpService::build()
             .h2(fn_service(|_| {
                 let broken_header = Bytes::from_static(b"\0\0\0");
-                ok::<_, ()>(
+                ok::<_, Infallible>(
                     Response::build(StatusCode::OK)
                         .insert_header((header::CONTENT_TYPE, broken_header))
                         .body(STR),
@@ -399,16 +402,19 @@ async fn test_h2_response_http_error_handling() {
 
     // read response
     let bytes = srv.load_body(response).await.unwrap();
-    assert_eq!(bytes, Bytes::from_static(b"failed to parse header value"));
+    assert_eq!(
+        bytes,
+        Bytes::from_static(b"error processing HTTP: failed to parse header value")
+    );
 }
 
 #[derive(Debug, Display, Error)]
 #[display(fmt = "error")]
 struct BadRequest;
 
-impl ResponseError for BadRequest {
+impl From<BadRequest> for Response<AnyBody> {
-    fn status_code(&self) -> StatusCode {
+    fn from(err: BadRequest) -> Self {
-        StatusCode::BAD_REQUEST
+        Response::build(StatusCode::BAD_REQUEST).body(err.to_string())
     }
 }
 
@@ -439,7 +445,7 @@ async fn test_h2_on_connect() {
             })
             .h2(|req: Request| {
                 assert!(req.extensions().contains::<isize>());
-                ok::<_, ()>(Response::ok())
+                ok::<_, Infallible>(Response::ok())
             })
             .openssl(tls_config())
             .map_err(|_| ())

actix-http/tests/test_rustls.rs

@@ -2,14 +2,21 @@
 
 extern crate tls_rustls as rustls;
 
+use std::{
+    convert::Infallible,
+    io::{self, BufReader, Write},
+    net::{SocketAddr, TcpStream as StdTcpStream},
+    sync::Arc,
+};
+
 use actix_http::{
-    body::{Body, SizedStream},
+    body::{AnyBody, Body, SizedStream},
     error::PayloadError,
     http::{
         header::{self, HeaderName, HeaderValue},
         Method, StatusCode, Version,
     },
-    Error, HttpService, Request, Response, ResponseError,
+    Error, HttpService, Request, Response,
 };
 use actix_http_test::test_server;
 use actix_service::{fn_factory_with_config, fn_service};
@@ -24,12 +31,6 @@ use rustls::{
 };
 use webpki::DNSNameRef;
 
-use std::{
-    io::{self, BufReader, Write},
-    net::{SocketAddr, TcpStream as StdTcpStream},
-    sync::Arc,
-};
-
 async fn load_body<S>(mut stream: S) -> Result<BytesMut, PayloadError>
 where
     S: Stream<Item = Result<Bytes, PayloadError>> + Unpin,
@@ -173,7 +174,7 @@ async fn test_h2_content_length() {
                     StatusCode::OK,
                     StatusCode::NOT_FOUND,
                 ];
-                ok::<_, ()>(Response::new(statuses[indx]))
+                ok::<_, Infallible>(Response::new(statuses[indx]))
             })
             .rustls(tls_config())
     })
@@ -242,7 +243,7 @@ async fn test_h2_headers() {
                         TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST ",
                 ));
             }
-            ok::<_, ()>(config.body(data.clone()))
+            ok::<_, Infallible>(config.body(data.clone()))
         })
             .rustls(tls_config())
     }).await;
@@ -281,7 +282,7 @@ const STR: &str = "Hello World Hello World Hello World Hello World Hello World \
 async fn test_h2_body2() {
     let mut srv = test_server(move || {
         HttpService::build()
-            .h2(|_| ok::<_, ()>(Response::ok().set_body(STR)))
+            .h2(|_| ok::<_, Infallible>(Response::ok().set_body(STR)))
             .rustls(tls_config())
     })
     .await;
@@ -298,7 +299,7 @@ async fn test_h2_body2() {
 async fn test_h2_head_empty() {
     let mut srv = test_server(move || {
         HttpService::build()
-            .finish(|_| ok::<_, ()>(Response::ok().set_body(STR)))
+            .finish(|_| ok::<_, Infallible>(Response::ok().set_body(STR)))
             .rustls(tls_config())
     })
     .await;
@@ -324,7 +325,7 @@ async fn test_h2_head_empty() {
 async fn test_h2_head_binary() {
     let mut srv = test_server(move || {
         HttpService::build()
-            .h2(|_| ok::<_, ()>(Response::ok().set_body(STR)))
+            .h2(|_| ok::<_, Infallible>(Response::ok().set_body(STR)))
             .rustls(tls_config())
     })
     .await;
@@ -349,7 +350,7 @@ async fn test_h2_head_binary() {
 async fn test_h2_head_binary2() {
     let srv = test_server(move || {
         HttpService::build()
-            .h2(|_| ok::<_, ()>(Response::ok().set_body(STR)))
+            .h2(|_| ok::<_, Infallible>(Response::ok().set_body(STR)))
             .rustls(tls_config())
     })
     .await;
@@ -371,8 +372,8 @@ async fn test_h2_body_length() {
     let mut srv = test_server(move || {
         HttpService::build()
             .h2(|_| {
-                let body = once(ok(Bytes::from_static(STR.as_ref())));
+                let body = once(ok::<_, Infallible>(Bytes::from_static(STR.as_ref())));
-                ok::<_, ()>(
+                ok::<_, Infallible>(
                     Response::ok().set_body(SizedStream::new(STR.len() as u64, body)),
                 )
             })
@@ -394,7 +395,7 @@ async fn test_h2_body_chunked_explicit() {
         HttpService::build()
             .h2(|_| {
                 let body = once(ok::<_, Error>(Bytes::from_static(STR.as_ref())));
-                ok::<_, ()>(
+                ok::<_, Infallible>(
                     Response::build(StatusCode::OK)
                         .insert_header((header::TRANSFER_ENCODING, "chunked"))
                         .streaming(body),
@@ -420,9 +421,9 @@ async fn test_h2_response_http_error_handling() {
     let mut srv = test_server(move || {
         HttpService::build()
             .h2(fn_factory_with_config(|_: ()| {
-                ok::<_, ()>(fn_service(|_| {
+                ok::<_, Infallible>(fn_service(|_| {
                     let broken_header = Bytes::from_static(b"\0\0\0");
-                    ok::<_, ()>(
+                    ok::<_, Infallible>(
                         Response::build(StatusCode::OK)
                             .insert_header((http::header::CONTENT_TYPE, broken_header))
                             .body(STR),
@@ -438,16 +439,19 @@ async fn test_h2_response_http_error_handling() {
 
     // read response
     let bytes = srv.load_body(response).await.unwrap();
-    assert_eq!(bytes, Bytes::from_static(b"failed to parse header value"));
+    assert_eq!(
+        bytes,
+        Bytes::from_static(b"error processing HTTP: failed to parse header value")
+    );
 }
 
 #[derive(Debug, Display, Error)]
 #[display(fmt = "error")]
 struct BadRequest;
 
-impl ResponseError for BadRequest {
+impl From<BadRequest> for Response<AnyBody> {
-    fn status_code(&self) -> StatusCode {
+    fn from(_: BadRequest) -> Self {
-        StatusCode::BAD_REQUEST
+        Response::bad_request().set_body(AnyBody::from("error"))
     }
 }
 

actix-http/tests/test_server.rs

@@ -1,21 +1,25 @@
-use std::io::{Read, Write};
+use std::{
-use std::time::Duration;
+    convert::Infallible,
-use std::{net, thread};
+    io::{Read, Write},
+    net, thread,
+    time::Duration,
+};
 
 use actix_http::{
-    body::{Body, SizedStream},
+    body::{AnyBody, Body, SizedStream},
-    http::{self, header, StatusCode},
+    header, http, Error, HttpMessage, HttpService, KeepAlive, Request, Response,
-    Error, HttpService, KeepAlive, Request, Response,
+    StatusCode,
 };
-use actix_http::{HttpMessage, ResponseError};
 use actix_http_test::test_server;
 use actix_rt::time::sleep;
 use actix_service::fn_service;
 use actix_utils::future::{err, ok, ready};
 use bytes::Bytes;
 use derive_more::{Display, Error};
-use futures_util::stream::{once, StreamExt as _};
+use futures_util::{
-use futures_util::FutureExt as _;
+    stream::{once, StreamExt as _},
+    FutureExt as _,
+};
 use regex::Regex;
 
 #[actix_rt::test]
@@ -27,7 +31,7 @@ async fn test_h1() {
             .client_disconnect(1000)
             .h1(|req: Request| {
                 assert!(req.peer_addr().is_some());
-                ok::<_, ()>(Response::ok())
+                ok::<_, Infallible>(Response::ok())
             })
             .tcp()
     })
@@ -47,7 +51,7 @@ async fn test_h1_2() {
             .finish(|req: Request| {
                 assert!(req.peer_addr().is_some());
                 assert_eq!(req.version(), http::Version::HTTP_11);
-                ok::<_, ()>(Response::ok())
+                ok::<_, Infallible>(Response::ok())
             })
             .tcp()
     })
@@ -61,9 +65,9 @@ async fn test_h1_2() {
 #[display(fmt = "expect failed")]
 struct ExpectFailed;
 
-impl ResponseError for ExpectFailed {
+impl From<ExpectFailed> for Response<AnyBody> {
-    fn status_code(&self) -> StatusCode {
+    fn from(_: ExpectFailed) -> Self {
-        StatusCode::PRECONDITION_FAILED
+        Response::new(StatusCode::EXPECTATION_FAILED)
     }
 }
 
@@ -78,7 +82,7 @@ async fn test_expect_continue() {
                     err(ExpectFailed)
                 }
             }))
-            .finish(|_| ok::<_, ()>(Response::ok()))
+            .finish(|_| ok::<_, Infallible>(Response::ok()))
             .tcp()
     })
     .await;
@@ -87,7 +91,7 @@ async fn test_expect_continue() {
     let _ = stream.write_all(b"GET /test HTTP/1.1\r\nexpect: 100-continue\r\n\r\n");
     let mut data = String::new();
     let _ = stream.read_to_string(&mut data);
-    assert!(data.starts_with("HTTP/1.1 412 Precondition Failed\r\ncontent-length"));
+    assert!(data.starts_with("HTTP/1.1 417 Expectation Failed\r\ncontent-length"));
 
     let mut stream = net::TcpStream::connect(srv.addr()).unwrap();
     let _ = stream.write_all(b"GET /test?yes= HTTP/1.1\r\nexpect: 100-continue\r\n\r\n");
@@ -109,7 +113,7 @@ async fn test_expect_continue_h1() {
                     }
                 })
             }))
-            .h1(fn_service(|_| ok::<_, ()>(Response::ok())))
+            .h1(fn_service(|_| ok::<_, Infallible>(Response::ok())))
             .tcp()
     })
     .await;
@@ -118,7 +122,7 @@ async fn test_expect_continue_h1() {
     let _ = stream.write_all(b"GET /test HTTP/1.1\r\nexpect: 100-continue\r\n\r\n");
     let mut data = String::new();
     let _ = stream.read_to_string(&mut data);
-    assert!(data.starts_with("HTTP/1.1 412 Precondition Failed\r\ncontent-length"));
+    assert!(data.starts_with("HTTP/1.1 417 Expectation Failed\r\ncontent-length"));
 
     let mut stream = net::TcpStream::connect(srv.addr()).unwrap();
     let _ = stream.write_all(b"GET /test?yes= HTTP/1.1\r\nexpect: 100-continue\r\n\r\n");
@@ -190,7 +194,7 @@ async fn test_slow_request() {
     let srv = test_server(|| {
         HttpService::build()
             .client_timeout(100)
-            .finish(|_| ok::<_, ()>(Response::ok()))
+            .finish(|_| ok::<_, Infallible>(Response::ok()))
             .tcp()
     })
     .await;
@@ -206,7 +210,7 @@ async fn test_slow_request() {
 async fn test_http1_malformed_request() {
     let srv = test_server(|| {
         HttpService::build()
-            .h1(|_| ok::<_, ()>(Response::ok()))
+            .h1(|_| ok::<_, Infallible>(Response::ok()))
             .tcp()
     })
     .await;
@@ -222,7 +226,7 @@ async fn test_http1_malformed_request() {
 async fn test_http1_keepalive() {
     let srv = test_server(|| {
         HttpService::build()
-            .h1(|_| ok::<_, ()>(Response::ok()))
+            .h1(|_| ok::<_, Infallible>(Response::ok()))
             .tcp()
     })
     .await;
@@ -244,7 +248,7 @@ async fn test_http1_keepalive_timeout() {
     let srv = test_server(|| {
         HttpService::build()
             .keep_alive(1)
-            .h1(|_| ok::<_, ()>(Response::ok()))
+            .h1(|_| ok::<_, Infallible>(Response::ok()))
             .tcp()
     })
     .await;
@@ -265,7 +269,7 @@ async fn test_http1_keepalive_timeout() {
 async fn test_http1_keepalive_close() {
     let srv = test_server(|| {
         HttpService::build()
-            .h1(|_| ok::<_, ()>(Response::ok()))
+            .h1(|_| ok::<_, Infallible>(Response::ok()))
             .tcp()
     })
     .await;
@@ -286,7 +290,7 @@ async fn test_http1_keepalive_close() {
 async fn test_http10_keepalive_default_close() {
     let srv = test_server(|| {
         HttpService::build()
-            .h1(|_| ok::<_, ()>(Response::ok()))
+            .h1(|_| ok::<_, Infallible>(Response::ok()))
             .tcp()
     })
     .await;
@@ -306,7 +310,7 @@ async fn test_http10_keepalive_default_close() {
 async fn test_http10_keepalive() {
     let srv = test_server(|| {
         HttpService::build()
-            .h1(|_| ok::<_, ()>(Response::ok()))
+            .h1(|_| ok::<_, Infallible>(Response::ok()))
             .tcp()
     })
     .await;
@@ -334,7 +338,7 @@ async fn test_http1_keepalive_disabled() {
     let srv = test_server(|| {
         HttpService::build()
             .keep_alive(KeepAlive::Disabled)
-            .h1(|_| ok::<_, ()>(Response::ok()))
+            .h1(|_| ok::<_, Infallible>(Response::ok()))
             .tcp()
     })
     .await;
@@ -369,7 +373,7 @@ async fn test_content_length() {
                     StatusCode::OK,
                     StatusCode::NOT_FOUND,
                 ];
-                ok::<_, ()>(Response::new(statuses[indx]))
+                ok::<_, Infallible>(Response::new(statuses[indx]))
             })
             .tcp()
     })
@@ -424,7 +428,7 @@ async fn test_h1_headers() {
                         TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST ",
                 ));
             }
-            ok::<_, ()>(builder.body(data.clone()))
+            ok::<_, Infallible>(builder.body(data.clone()))
         }).tcp()
     }).await;
 
@@ -462,7 +466,7 @@ const STR: &str = "Hello World Hello World Hello World Hello World Hello World \
 async fn test_h1_body() {
     let mut srv = test_server(|| {
         HttpService::build()
-            .h1(|_| ok::<_, ()>(Response::ok().set_body(STR)))
+            .h1(|_| ok::<_, Infallible>(Response::ok().set_body(STR)))
             .tcp()
     })
     .await;
@@ -479,7 +483,7 @@ async fn test_h1_body() {
 async fn test_h1_head_empty() {
     let mut srv = test_server(|| {
         HttpService::build()
-            .h1(|_| ok::<_, ()>(Response::ok().set_body(STR)))
+            .h1(|_| ok::<_, Infallible>(Response::ok().set_body(STR)))
             .tcp()
     })
     .await;
@@ -504,7 +508,7 @@ async fn test_h1_head_empty() {
 async fn test_h1_head_binary() {
     let mut srv = test_server(|| {
         HttpService::build()
-            .h1(|_| ok::<_, ()>(Response::ok().set_body(STR)))
+            .h1(|_| ok::<_, Infallible>(Response::ok().set_body(STR)))
             .tcp()
     })
     .await;
@@ -529,7 +533,7 @@ async fn test_h1_head_binary() {
 async fn test_h1_head_binary2() {
     let srv = test_server(|| {
         HttpService::build()
-            .h1(|_| ok::<_, ()>(Response::ok().set_body(STR)))
+            .h1(|_| ok::<_, Infallible>(Response::ok().set_body(STR)))
             .tcp()
     })
     .await;
@@ -551,8 +555,8 @@ async fn test_h1_body_length() {
     let mut srv = test_server(|| {
         HttpService::build()
             .h1(|_| {
-                let body = once(ok(Bytes::from_static(STR.as_ref())));
+                let body = once(ok::<_, Infallible>(Bytes::from_static(STR.as_ref())));
-                ok::<_, ()>(
+                ok::<_, Infallible>(
                     Response::ok().set_body(SizedStream::new(STR.len() as u64, body)),
                 )
             })
@@ -574,7 +578,7 @@ async fn test_h1_body_chunked_explicit() {
         HttpService::build()
             .h1(|_| {
                 let body = once(ok::<_, Error>(Bytes::from_static(STR.as_ref())));
-                ok::<_, ()>(
+                ok::<_, Infallible>(
                     Response::build(StatusCode::OK)
                         .insert_header((header::TRANSFER_ENCODING, "chunked"))
                         .streaming(body),
@@ -609,7 +613,7 @@ async fn test_h1_body_chunked_implicit() {
         HttpService::build()
             .h1(|_| {
                 let body = once(ok::<_, Error>(Bytes::from_static(STR.as_ref())));
-                ok::<_, ()>(Response::build(StatusCode::OK).streaming(body))
+                ok::<_, Infallible>(Response::build(StatusCode::OK).streaming(body))
             })
             .tcp()
     })
@@ -638,7 +642,7 @@ async fn test_h1_response_http_error_handling() {
         HttpService::build()
             .h1(fn_service(|_| {
                 let broken_header = Bytes::from_static(b"\0\0\0");
-                ok::<_, ()>(
+                ok::<_, Infallible>(
                     Response::build(StatusCode::OK)
                         .insert_header((http::header::CONTENT_TYPE, broken_header))
                         .body(STR),
@@ -653,16 +657,19 @@ async fn test_h1_response_http_error_handling() {
 
     // read response
     let bytes = srv.load_body(response).await.unwrap();
-    assert_eq!(bytes, Bytes::from_static(b"failed to parse header value"));
+    assert_eq!(
+        bytes,
+        Bytes::from_static(b"error processing HTTP: failed to parse header value")
+    );
 }
 
 #[derive(Debug, Display, Error)]
 #[display(fmt = "error")]
 struct BadRequest;
 
-impl ResponseError for BadRequest {
+impl From<BadRequest> for Response<AnyBody> {
-    fn status_code(&self) -> StatusCode {
+    fn from(_: BadRequest) -> Self {
-        StatusCode::BAD_REQUEST
+        Response::bad_request().set_body(AnyBody::from("error"))
     }
 }
 
@@ -692,7 +699,7 @@ async fn test_h1_on_connect() {
             })
             .h1(|req: Request| {
                 assert!(req.extensions().contains::<isize>());
-                ok::<_, ()>(Response::ok())
+                ok::<_, Infallible>(Response::ok())
             })
             .tcp()
     })

actix-http/tests/test_ws.rs

@@ -1,11 +1,12 @@
 use std::{
     cell::Cell,
+    convert::Infallible,
     task::{Context, Poll},
 };
 
 use actix_codec::{AsyncRead, AsyncWrite, Framed};
 use actix_http::{
-    body::BodySize,
+    body::{AnyBody, BodySize},
     h1,
     ws::{self, CloseCode, Frame, Item, Message},
     Error, HttpService, Request, Response,
@@ -13,6 +14,7 @@ use actix_http::{
 use actix_http_test::test_server;
 use actix_service::{fn_factory, Service};
 use bytes::Bytes;
+use derive_more::{Display, Error, From};
 use futures_core::future::LocalBoxFuture;
 use futures_util::{SinkExt as _, StreamExt as _};
 
@@ -33,12 +35,39 @@ impl WsService {
     }
 }
 
+#[derive(Debug, Display, Error, From)]
+enum WsServiceError {
+    #[display(fmt = "http error")]
+    Http(actix_http::Error),
+
+    #[display(fmt = "ws handshake error")]
+    Ws(actix_http::ws::HandshakeError),
+
+    #[display(fmt = "io error")]
+    Io(std::io::Error),
+
+    #[display(fmt = "dispatcher error")]
+    Dispatcher,
+}
+
+impl From<WsServiceError> for Response<AnyBody> {
+    fn from(err: WsServiceError) -> Self {
+        match err {
+            WsServiceError::Http(err) => err.into(),
+            WsServiceError::Ws(err) => err.into(),
+            WsServiceError::Io(_err) => unreachable!(),
+            WsServiceError::Dispatcher => Response::internal_server_error()
+                .set_body(AnyBody::from(format!("{}", err))),
+        }
+    }
+}
+
 impl<T> Service<(Request, Framed<T, h1::Codec>)> for WsService
 where
     T: AsyncRead + AsyncWrite + Unpin + 'static,
 {
     type Response = ();
-    type Error = Error;
+    type Error = WsServiceError;
     type Future = LocalBoxFuture<'static, Result<Self::Response, Self::Error>>;
 
     fn poll_ready(&self, _: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
@@ -56,7 +85,9 @@ where
 
             let framed = framed.replace_codec(ws::Codec::new());
 
-            ws::Dispatcher::with(framed, service).await?;
+            ws::Dispatcher::with(framed, service)
+                .await
+                .map_err(|_| WsServiceError::Dispatcher)?;
 
             Ok(())
         })
@@ -72,7 +103,7 @@ async fn service(msg: Frame) -> Result<Message, Error> {
         Frame::Binary(bin) => Message::Binary(bin),
         Frame::Continuation(item) => Message::Continuation(item),
         Frame::Close(reason) => Message::Close(reason),
-        _ => return Err(Error::from(ws::ProtocolError::BadOpCode)),
+        _ => return Err(ws::ProtocolError::BadOpCode.into()),
     };
 
     Ok(msg)
@@ -82,8 +113,10 @@ async fn service(msg: Frame) -> Result<Message, Error> {
 async fn test_simple() {
     let mut srv = test_server(|| {
         HttpService::build()
-            .upgrade(fn_factory(|| async { Ok::<_, ()>(WsService::new()) }))
+            .upgrade(fn_factory(|| async {
-            .finish(|_| async { Ok::<_, ()>(Response::not_found()) })
+                Ok::<_, Infallible>(WsService::new())
+            }))
+            .finish(|_| async { Ok::<_, Infallible>(Response::not_found()) })
             .tcp()
     })
     .await;

actix-test/src/lib.rs

@@ -31,7 +31,7 @@ extern crate tls_openssl as openssl;
 #[cfg(feature = "rustls")]
 extern crate tls_rustls as rustls;
 
-use std::{fmt, net, sync::mpsc, thread, time};
+use std::{error::Error as StdError, fmt, net, sync::mpsc, thread, time};
 
 use actix_codec::{AsyncRead, AsyncWrite, Framed};
 pub use actix_http::test::TestBuffer;
@@ -39,7 +39,7 @@ use actix_http::{
     http::{HeaderMap, Method},
     ws, HttpService, Request, Response,
 };
-use actix_service::{map_config, IntoServiceFactory, ServiceFactory};
+use actix_service::{map_config, IntoServiceFactory, ServiceFactory, ServiceFactoryExt as _};
 use actix_web::{
     dev::{AppConfig, MessageBody, Server, Service},
     rt, web, Error,
@@ -86,7 +86,7 @@ where
     S::Response: Into<Response<B>> + 'static,
     <S::Service as Service<Request>>::Future: 'static,
     B: MessageBody + 'static,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 {
     start_with(TestServerConfig::default(), factory)
 }
@@ -126,7 +126,7 @@ where
     S::Response: Into<Response<B>> + 'static,
     <S::Service as Service<Request>>::Future: 'static,
     B: MessageBody + 'static,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 {
     let (tx, rx) = mpsc::channel();
 
@@ -153,25 +153,40 @@ where
                 HttpVer::Http1 => builder.listen("test", tcp, move || {
                     let app_cfg =
                         AppConfig::__priv_test_new(false, local_addr.to_string(), local_addr);
+
+                    let fac = factory()
+                        .into_factory()
+                        .map_err(|err| err.into().error_response());
+
                     HttpService::build()
                         .client_timeout(timeout)
-                        .h1(map_config(factory(), move |_| app_cfg.clone()))
+                        .h1(map_config(fac, move |_| app_cfg.clone()))
                         .tcp()
                 }),
                 HttpVer::Http2 => builder.listen("test", tcp, move || {
                     let app_cfg =
                         AppConfig::__priv_test_new(false, local_addr.to_string(), local_addr);
+
+                    let fac = factory()
+                        .into_factory()
+                        .map_err(|err| err.into().error_response());
+
                     HttpService::build()
                         .client_timeout(timeout)
-                        .h2(map_config(factory(), move |_| app_cfg.clone()))
+                        .h2(map_config(fac, move |_| app_cfg.clone()))
                         .tcp()
                 }),
                 HttpVer::Both => builder.listen("test", tcp, move || {
                     let app_cfg =
                         AppConfig::__priv_test_new(false, local_addr.to_string(), local_addr);
+
+                    let fac = factory()
+                        .into_factory()
+                        .map_err(|err| err.into().error_response());
+
                     HttpService::build()
                         .client_timeout(timeout)
-                        .finish(map_config(factory(), move |_| app_cfg.clone()))
+                        .finish(map_config(fac, move |_| app_cfg.clone()))
                         .tcp()
                 }),
             },
@@ -180,25 +195,40 @@ where
                 HttpVer::Http1 => builder.listen("test", tcp, move || {
                     let app_cfg =
                         AppConfig::__priv_test_new(false, local_addr.to_string(), local_addr);
+
+                    let fac = factory()
+                        .into_factory()
+                        .map_err(|err| err.into().error_response());
+
                     HttpService::build()
                         .client_timeout(timeout)
-                        .h1(map_config(factory(), move |_| app_cfg.clone()))
+                        .h1(map_config(fac, move |_| app_cfg.clone()))
                         .openssl(acceptor.clone())
                 }),
                 HttpVer::Http2 => builder.listen("test", tcp, move || {
                     let app_cfg =
                         AppConfig::__priv_test_new(false, local_addr.to_string(), local_addr);
+
+                    let fac = factory()
+                        .into_factory()
+                        .map_err(|err| err.into().error_response());
+
                     HttpService::build()
                         .client_timeout(timeout)
-                        .h2(map_config(factory(), move |_| app_cfg.clone()))
+                        .h2(map_config(fac, move |_| app_cfg.clone()))
                         .openssl(acceptor.clone())
                 }),
                 HttpVer::Both => builder.listen("test", tcp, move || {
                     let app_cfg =
                         AppConfig::__priv_test_new(false, local_addr.to_string(), local_addr);
+
+                    let fac = factory()
+                        .into_factory()
+                        .map_err(|err| err.into().error_response());
+
                     HttpService::build()
                         .client_timeout(timeout)
-                        .finish(map_config(factory(), move |_| app_cfg.clone()))
+                        .finish(map_config(fac, move |_| app_cfg.clone()))
                         .openssl(acceptor.clone())
                 }),
             },
@@ -207,25 +237,40 @@ where
                 HttpVer::Http1 => builder.listen("test", tcp, move || {
                     let app_cfg =
                         AppConfig::__priv_test_new(false, local_addr.to_string(), local_addr);
+
+                    let fac = factory()
+                        .into_factory()
+                        .map_err(|err| err.into().error_response());
+
                     HttpService::build()
                         .client_timeout(timeout)
-                        .h1(map_config(factory(), move |_| app_cfg.clone()))
+                        .h1(map_config(fac, move |_| app_cfg.clone()))
                         .rustls(config.clone())
                 }),
                 HttpVer::Http2 => builder.listen("test", tcp, move || {
                     let app_cfg =
                         AppConfig::__priv_test_new(false, local_addr.to_string(), local_addr);
+
+                    let fac = factory()
+                        .into_factory()
+                        .map_err(|err| err.into().error_response());
+
                     HttpService::build()
                         .client_timeout(timeout)
-                        .h2(map_config(factory(), move |_| app_cfg.clone()))
+                        .h2(map_config(fac, move |_| app_cfg.clone()))
                         .rustls(config.clone())
                 }),
                 HttpVer::Both => builder.listen("test", tcp, move || {
                     let app_cfg =
                         AppConfig::__priv_test_new(false, local_addr.to_string(), local_addr);
+
+                    let fac = factory()
+                        .into_factory()
+                        .map_err(|err| err.into().error_response());
+
                     HttpService::build()
                         .client_timeout(timeout)
-                        .finish(map_config(factory(), move |_| app_cfg.clone()))
+                        .finish(map_config(fac, move |_| app_cfg.clone()))
                         .rustls(config.clone())
                 }),
             },

actix-web-actors/src/ws.rs

@@ -22,10 +22,11 @@ use actix_http::{
     http::HeaderValue,
     ws::{hash_key, Codec},
 };
-use actix_web::error::{Error, PayloadError};
+use actix_web::{
-use actix_web::http::{header, Method, StatusCode};
+    error::{Error, PayloadError},
-use actix_web::HttpResponseBuilder;
+    http::{header, Method, StatusCode},
-use actix_web::{HttpRequest, HttpResponse};
+    HttpRequest, HttpResponse, HttpResponseBuilder,
+};
 use bytes::{Bytes, BytesMut};
 use bytestring::ByteString;
 use futures_core::Stream;

awc/examples/client.rs

@@ -1,7 +1,7 @@
-use actix_http::Error;
+use std::error::Error as StdError;
 
 #[actix_web::main]
-async fn main() -> Result<(), Error> {
+async fn main() -> Result<(), Box<dyn StdError>> {
     std::env::set_var("RUST_LOG", "actix_http=trace");
     env_logger::init();
 

awc/src/error.rs

@@ -6,7 +6,6 @@ pub use actix_http::http::Error as HttpError;
 pub use actix_http::ws::HandshakeError as WsHandshakeError;
 pub use actix_http::ws::ProtocolError as WsProtocolError;
 
-use actix_http::ResponseError;
 use serde_json::error::Error as JsonError;
 
 use actix_http::http::{header::HeaderValue, StatusCode};
@@ -77,6 +76,3 @@ pub enum JsonPayloadError {
 }
 
 impl std::error::Error for JsonPayloadError {}
-
-/// Return `InternalServerError` for `JsonPayloadError`
-impl ResponseError for JsonPayloadError {}

awc/src/frozen.rs

@@ -1,21 +1,21 @@
-use std::convert::TryFrom;
+use std::{convert::TryFrom, error::Error as StdError, net, rc::Rc, time::Duration};
-use std::net;
-use std::rc::Rc;
-use std::time::Duration;
 
 use bytes::Bytes;
 use futures_core::Stream;
 use serde::Serialize;
 
-use actix_http::body::Body;
+use actix_http::{
-use actix_http::http::header::IntoHeaderValue;
+    body::Body,
-use actix_http::http::{Error as HttpError, HeaderMap, HeaderName, Method, Uri};
+    http::{header::IntoHeaderValue, Error as HttpError, HeaderMap, HeaderName, Method, Uri},
-use actix_http::{Error, RequestHead};
+    RequestHead,
+};
 
-use crate::sender::{RequestSender, SendClientRequest};
+use crate::{
-use crate::ClientConfig;
+    sender::{RequestSender, SendClientRequest},
+    ClientConfig,
+};
 
-/// `FrozenClientRequest` struct represents clonable client request.
+/// `FrozenClientRequest` struct represents cloneable client request.
 /// It could be used to send same request multiple times.
 #[derive(Clone)]
 pub struct FrozenClientRequest {
@@ -82,7 +82,7 @@ impl FrozenClientRequest {
     pub fn send_stream<S, E>(&self, stream: S) -> SendClientRequest
     where
         S: Stream<Item = Result<Bytes, E>> + Unpin + 'static,
-        E: Into<Error> + 'static,
+        E: Into<Box<dyn StdError>> + 'static,
     {
         RequestSender::Rc(self.head.clone(), None).send_stream(
             self.addr,
@@ -207,7 +207,7 @@ impl FrozenSendBuilder {
     pub fn send_stream<S, E>(self, stream: S) -> SendClientRequest
     where
         S: Stream<Item = Result<Bytes, E>> + Unpin + 'static,
-        E: Into<Error> + 'static,
+        E: Into<Box<dyn StdError>> + 'static,
     {
         if let Some(e) = self.err {
             return e.into();

awc/src/lib.rs

@@ -128,8 +128,7 @@ pub use self::sender::SendClientRequest;
 
 /// An asynchronous HTTP and WebSocket client.
 ///
-/// ## Examples
+/// # Examples
-///
 /// ```
 /// use awc::Client;
 ///

awc/src/request.rs

@@ -1,25 +1,26 @@
-use std::convert::TryFrom;
+use std::{convert::TryFrom, error::Error as StdError, fmt, net, rc::Rc, time::Duration};
-use std::rc::Rc;
-use std::time::Duration;
-use std::{fmt, net};
 
 use bytes::Bytes;
 use futures_core::Stream;
 use serde::Serialize;
 
-use actix_http::body::Body;
+use actix_http::{
-use actix_http::http::header::{self, IntoHeaderPair};
+    body::Body,
-use actix_http::http::{
+    http::{
-    uri, ConnectionType, Error as HttpError, HeaderMap, HeaderValue, Method, Uri, Version,
+        header::{self, IntoHeaderPair},
+        uri, ConnectionType, Error as HttpError, HeaderMap, HeaderValue, Method, Uri, Version,
+    },
+    RequestHead,
 };
-use actix_http::{Error, RequestHead};
 
 #[cfg(feature = "cookies")]
 use crate::cookie::{Cookie, CookieJar};
-use crate::error::{FreezeRequestError, InvalidUrl};
+use crate::{
-use crate::frozen::FrozenClientRequest;
+    error::{FreezeRequestError, InvalidUrl},
-use crate::sender::{PrepForSendingError, RequestSender, SendClientRequest};
+    frozen::FrozenClientRequest,
-use crate::ClientConfig;
+    sender::{PrepForSendingError, RequestSender, SendClientRequest},
+    ClientConfig,
+};
 
 #[cfg(feature = "compress")]
 const HTTPS_ENCODING: &str = "br, gzip, deflate";
@@ -408,7 +409,7 @@ impl ClientRequest {
     pub fn send_stream<S, E>(self, stream: S) -> SendClientRequest
     where
         S: Stream<Item = Result<Bytes, E>> + Unpin + 'static,
-        E: Into<Error> + 'static,
+        E: Into<Box<dyn StdError>> + 'static,
     {
         let slf = match self.prep_for_sending() {
             Ok(slf) => slf,

awc/src/sender.rs

@@ -1,6 +1,7 @@
 use std::{
+    error::Error as StdError,
     future::Future,
-    io, net,
+    net,
     pin::Pin,
     rc::Rc,
     task::{Context, Poll},
@@ -24,22 +25,30 @@ use serde::Serialize;
 #[cfg(feature = "compress")]
 use actix_http::{encoding::Decoder, http::header::ContentEncoding, Payload, PayloadStream};
 
-use crate::connect::{ConnectRequest, ConnectResponse};
+use crate::{
-use crate::error::{FreezeRequestError, InvalidUrl, SendRequestError};
+    error::{FreezeRequestError, InvalidUrl, SendRequestError},
-use crate::response::ClientResponse;
+    ClientConfig, ClientResponse, ConnectRequest, ConnectResponse,
-use crate::ClientConfig;
+};
 
 #[derive(Debug, From)]
 pub(crate) enum PrepForSendingError {
     Url(InvalidUrl),
     Http(HttpError),
+    Json(serde_json::Error),
+    Form(serde_urlencoded::ser::Error),
 }
 
 impl From<PrepForSendingError> for FreezeRequestError {
     fn from(err: PrepForSendingError) -> FreezeRequestError {
         match err {
-            PrepForSendingError::Url(e) => FreezeRequestError::Url(e),
+            PrepForSendingError::Url(err) => FreezeRequestError::Url(err),
-            PrepForSendingError::Http(e) => FreezeRequestError::Http(e),
+            PrepForSendingError::Http(err) => FreezeRequestError::Http(err),
+            PrepForSendingError::Json(err) => {
+                FreezeRequestError::Custom(Box::new(err), Box::new("json serialization error"))
+            }
+            PrepForSendingError::Form(err) => {
+                FreezeRequestError::Custom(Box::new(err), Box::new("form serialization error"))
+            }
         }
     }
 }
@@ -49,6 +58,12 @@ impl From<PrepForSendingError> for SendRequestError {
         match err {
             PrepForSendingError::Url(e) => SendRequestError::Url(e),
             PrepForSendingError::Http(e) => SendRequestError::Http(e),
+            PrepForSendingError::Json(err) => {
+                SendRequestError::Custom(Box::new(err), Box::new("json serialization error"))
+            }
+            PrepForSendingError::Form(err) => {
+                SendRequestError::Custom(Box::new(err), Box::new("form serialization error"))
+            }
         }
     }
 }
@@ -209,8 +224,7 @@ impl RequestSender {
     ) -> SendClientRequest {
         let body = match serde_json::to_string(value) {
             Ok(body) => body,
-            // TODO: own error type
+            Err(err) => return PrepForSendingError::Json(err).into(),
-            Err(e) => return Error::from(io::Error::new(io::ErrorKind::Other, e)).into(),
         };
 
         if let Err(e) = self.set_header_if_none(header::CONTENT_TYPE, "application/json") {
@@ -236,8 +250,7 @@ impl RequestSender {
     ) -> SendClientRequest {
         let body = match serde_urlencoded::to_string(value) {
             Ok(body) => body,
-            // TODO: own error type
+            Err(err) => return PrepForSendingError::Form(err).into(),
-            Err(e) => return Error::from(io::Error::new(io::ErrorKind::Other, e)).into(),
         };
 
         // set content-type
@@ -266,7 +279,7 @@ impl RequestSender {
     ) -> SendClientRequest
     where
         S: Stream<Item = Result<Bytes, E>> + Unpin + 'static,
-        E: Into<Error> + 'static,
+        E: Into<Box<dyn StdError>> + 'static,
     {
         self.send_body(
             addr,

src/data.rs

@@ -1,12 +1,13 @@
 use std::{any::type_name, ops::Deref, sync::Arc};
 
-use actix_http::{error::Error, Extensions};
+use actix_http::Extensions;
 use actix_utils::future::{err, ok, Ready};
 use futures_core::future::LocalBoxFuture;
 use serde::Serialize;
 
 use crate::{
     dev::Payload, error::ErrorInternalServerError, extract::FromRequest, request::HttpRequest,
+    Error,
 };
 
 /// Data factory.

src/error/error.rs

@@ -0,0 +1,76 @@
+use std::{error::Error as StdError, fmt};
+
+use actix_http::{body::AnyBody, Response};
+
+use crate::{HttpResponse, ResponseError};
+
+/// General purpose actix web error.
+///
+/// An actix web error is used to carry errors from `std::error`
+/// through actix in a convenient way.  It can be created through
+/// converting errors with `into()`.
+///
+/// Whenever it is created from an external object a response error is created
+/// for it that can be used to create an HTTP response from it this means that
+/// if you have access to an actix `Error` you can always get a
+/// `ResponseError` reference from it.
+pub struct Error {
+    cause: Box<dyn ResponseError>,
+}
+
+impl Error {
+    /// Returns the reference to the underlying `ResponseError`.
+    pub fn as_response_error(&self) -> &dyn ResponseError {
+        self.cause.as_ref()
+    }
+
+    /// Similar to `as_response_error` but downcasts.
+    pub fn as_error<T: ResponseError + 'static>(&self) -> Option<&T> {
+        <dyn ResponseError>::downcast_ref(self.cause.as_ref())
+    }
+
+    /// Shortcut for creating an `HttpResponse`.
+    pub fn error_response(&self) -> HttpResponse {
+        self.cause.error_response()
+    }
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Display::fmt(&self.cause, f)
+    }
+}
+
+impl fmt::Debug for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{:?}", &self.cause)
+    }
+}
+
+impl StdError for Error {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        // TODO: populate if replacement for Box<dyn Error> is found
+        None
+    }
+}
+
+impl From<std::convert::Infallible> for Error {
+    fn from(val: std::convert::Infallible) -> Self {
+        match val {}
+    }
+}
+
+/// `Error` for any error that implements `ResponseError`
+impl<T: ResponseError + 'static> From<T> for Error {
+    fn from(err: T) -> Error {
+        Error {
+            cause: Box::new(err),
+        }
+    }
+}
+
+impl From<Error> for Response<AnyBody> {
+    fn from(err: Error) -> Response<AnyBody> {
+        err.error_response().into()
+    }
+}

src/error/internal.rs

@@ -1,9 +1,9 @@
 use std::{cell::RefCell, fmt, io::Write as _};
 
-use actix_http::{body::Body, header, Response, StatusCode};
+use actix_http::{body::Body, header, StatusCode};
 use bytes::{BufMut as _, BytesMut};
 
-use crate::{Error, HttpResponse, ResponseError};
+use crate::{Error, HttpRequest, HttpResponse, Responder, ResponseError};
 
 /// Wraps errors to alter the generated response status code.
 ///
@@ -77,10 +77,10 @@ where
         }
     }
 
-    fn error_response(&self) -> Response<Body> {
+    fn error_response(&self) -> HttpResponse {
         match self.status {
             InternalErrorType::Status(status) => {
-                let mut res = Response::new(status);
+                let mut res = HttpResponse::new(status);
                 let mut buf = BytesMut::new().writer();
                 let _ = write!(buf, "{}", self);
 
@@ -88,20 +88,29 @@ where
                     header::CONTENT_TYPE,
                     header::HeaderValue::from_static("text/plain; charset=utf-8"),
                 );
-                res.set_body(Body::from(buf.into_inner())).into()
+                res.set_body(Body::from(buf.into_inner()))
             }
 
             InternalErrorType::Response(ref resp) => {
                 if let Some(resp) = resp.borrow_mut().take() {
-                    resp.into()
+                    resp
                 } else {
-                    Response::new(StatusCode::INTERNAL_SERVER_ERROR)
+                    HttpResponse::new(StatusCode::INTERNAL_SERVER_ERROR)
                 }
             }
         }
     }
 }
 
+impl<T> Responder for InternalError<T>
+where
+    T: fmt::Debug + fmt::Display + 'static,
+{
+    fn respond_to(self, _: &HttpRequest) -> HttpResponse {
+        HttpResponse::from_error(self)
+    }
+}
+
 macro_rules! error_helper {
     ($name:ident, $status:ident) => {
         paste::paste! {
@@ -171,134 +180,134 @@ error_helper!(
 
 #[cfg(test)]
 mod tests {
-    use actix_http::{error::ParseError, Response};
+    use actix_http::error::ParseError;
 
     use super::*;
 
     #[test]
     fn test_internal_error() {
         let err = InternalError::from_response(ParseError::Method, HttpResponse::Ok().finish());
-        let resp: Response<Body> = err.error_response();
+        let resp: HttpResponse = err.error_response();
         assert_eq!(resp.status(), StatusCode::OK);
     }
 
     #[test]
     fn test_error_helpers() {
-        let res: Response<Body> = ErrorBadRequest("err").into();
+        let res: HttpResponse = ErrorBadRequest("err").into();
         assert_eq!(res.status(), StatusCode::BAD_REQUEST);
 
-        let res: Response<Body> = ErrorUnauthorized("err").into();
+        let res: HttpResponse = ErrorUnauthorized("err").into();
         assert_eq!(res.status(), StatusCode::UNAUTHORIZED);
 
-        let res: Response<Body> = ErrorPaymentRequired("err").into();
+        let res: HttpResponse = ErrorPaymentRequired("err").into();
         assert_eq!(res.status(), StatusCode::PAYMENT_REQUIRED);
 
-        let res: Response<Body> = ErrorForbidden("err").into();
+        let res: HttpResponse = ErrorForbidden("err").into();
         assert_eq!(res.status(), StatusCode::FORBIDDEN);
 
-        let res: Response<Body> = ErrorNotFound("err").into();
+        let res: HttpResponse = ErrorNotFound("err").into();
         assert_eq!(res.status(), StatusCode::NOT_FOUND);
 
-        let res: Response<Body> = ErrorMethodNotAllowed("err").into();
+        let res: HttpResponse = ErrorMethodNotAllowed("err").into();
         assert_eq!(res.status(), StatusCode::METHOD_NOT_ALLOWED);
 
-        let res: Response<Body> = ErrorNotAcceptable("err").into();
+        let res: HttpResponse = ErrorNotAcceptable("err").into();
         assert_eq!(res.status(), StatusCode::NOT_ACCEPTABLE);
 
-        let res: Response<Body> = ErrorProxyAuthenticationRequired("err").into();
+        let res: HttpResponse = ErrorProxyAuthenticationRequired("err").into();
         assert_eq!(res.status(), StatusCode::PROXY_AUTHENTICATION_REQUIRED);
 
-        let res: Response<Body> = ErrorRequestTimeout("err").into();
+        let res: HttpResponse = ErrorRequestTimeout("err").into();
         assert_eq!(res.status(), StatusCode::REQUEST_TIMEOUT);
 
-        let res: Response<Body> = ErrorConflict("err").into();
+        let res: HttpResponse = ErrorConflict("err").into();
         assert_eq!(res.status(), StatusCode::CONFLICT);
 
-        let res: Response<Body> = ErrorGone("err").into();
+        let res: HttpResponse = ErrorGone("err").into();
         assert_eq!(res.status(), StatusCode::GONE);
 
-        let res: Response<Body> = ErrorLengthRequired("err").into();
+        let res: HttpResponse = ErrorLengthRequired("err").into();
         assert_eq!(res.status(), StatusCode::LENGTH_REQUIRED);
 
-        let res: Response<Body> = ErrorPreconditionFailed("err").into();
+        let res: HttpResponse = ErrorPreconditionFailed("err").into();
         assert_eq!(res.status(), StatusCode::PRECONDITION_FAILED);
 
-        let res: Response<Body> = ErrorPayloadTooLarge("err").into();
+        let res: HttpResponse = ErrorPayloadTooLarge("err").into();
         assert_eq!(res.status(), StatusCode::PAYLOAD_TOO_LARGE);
 
-        let res: Response<Body> = ErrorUriTooLong("err").into();
+        let res: HttpResponse = ErrorUriTooLong("err").into();
         assert_eq!(res.status(), StatusCode::URI_TOO_LONG);
 
-        let res: Response<Body> = ErrorUnsupportedMediaType("err").into();
+        let res: HttpResponse = ErrorUnsupportedMediaType("err").into();
         assert_eq!(res.status(), StatusCode::UNSUPPORTED_MEDIA_TYPE);
 
-        let res: Response<Body> = ErrorRangeNotSatisfiable("err").into();
+        let res: HttpResponse = ErrorRangeNotSatisfiable("err").into();
         assert_eq!(res.status(), StatusCode::RANGE_NOT_SATISFIABLE);
 
-        let res: Response<Body> = ErrorExpectationFailed("err").into();
+        let res: HttpResponse = ErrorExpectationFailed("err").into();
         assert_eq!(res.status(), StatusCode::EXPECTATION_FAILED);
 
-        let res: Response<Body> = ErrorImATeapot("err").into();
+        let res: HttpResponse = ErrorImATeapot("err").into();
         assert_eq!(res.status(), StatusCode::IM_A_TEAPOT);
 
-        let res: Response<Body> = ErrorMisdirectedRequest("err").into();
+        let res: HttpResponse = ErrorMisdirectedRequest("err").into();
         assert_eq!(res.status(), StatusCode::MISDIRECTED_REQUEST);
 
-        let res: Response<Body> = ErrorUnprocessableEntity("err").into();
+        let res: HttpResponse = ErrorUnprocessableEntity("err").into();
         assert_eq!(res.status(), StatusCode::UNPROCESSABLE_ENTITY);
 
-        let res: Response<Body> = ErrorLocked("err").into();
+        let res: HttpResponse = ErrorLocked("err").into();
         assert_eq!(res.status(), StatusCode::LOCKED);
 
-        let res: Response<Body> = ErrorFailedDependency("err").into();
+        let res: HttpResponse = ErrorFailedDependency("err").into();
         assert_eq!(res.status(), StatusCode::FAILED_DEPENDENCY);
 
-        let res: Response<Body> = ErrorUpgradeRequired("err").into();
+        let res: HttpResponse = ErrorUpgradeRequired("err").into();
         assert_eq!(res.status(), StatusCode::UPGRADE_REQUIRED);
 
-        let res: Response<Body> = ErrorPreconditionRequired("err").into();
+        let res: HttpResponse = ErrorPreconditionRequired("err").into();
         assert_eq!(res.status(), StatusCode::PRECONDITION_REQUIRED);
 
-        let res: Response<Body> = ErrorTooManyRequests("err").into();
+        let res: HttpResponse = ErrorTooManyRequests("err").into();
         assert_eq!(res.status(), StatusCode::TOO_MANY_REQUESTS);
 
-        let res: Response<Body> = ErrorRequestHeaderFieldsTooLarge("err").into();
+        let res: HttpResponse = ErrorRequestHeaderFieldsTooLarge("err").into();
         assert_eq!(res.status(), StatusCode::REQUEST_HEADER_FIELDS_TOO_LARGE);
 
-        let res: Response<Body> = ErrorUnavailableForLegalReasons("err").into();
+        let res: HttpResponse = ErrorUnavailableForLegalReasons("err").into();
         assert_eq!(res.status(), StatusCode::UNAVAILABLE_FOR_LEGAL_REASONS);
 
-        let res: Response<Body> = ErrorInternalServerError("err").into();
+        let res: HttpResponse = ErrorInternalServerError("err").into();
         assert_eq!(res.status(), StatusCode::INTERNAL_SERVER_ERROR);
 
-        let res: Response<Body> = ErrorNotImplemented("err").into();
+        let res: HttpResponse = ErrorNotImplemented("err").into();
         assert_eq!(res.status(), StatusCode::NOT_IMPLEMENTED);
 
-        let res: Response<Body> = ErrorBadGateway("err").into();
+        let res: HttpResponse = ErrorBadGateway("err").into();
         assert_eq!(res.status(), StatusCode::BAD_GATEWAY);
 
-        let res: Response<Body> = ErrorServiceUnavailable("err").into();
+        let res: HttpResponse = ErrorServiceUnavailable("err").into();
         assert_eq!(res.status(), StatusCode::SERVICE_UNAVAILABLE);
 
-        let res: Response<Body> = ErrorGatewayTimeout("err").into();
+        let res: HttpResponse = ErrorGatewayTimeout("err").into();
         assert_eq!(res.status(), StatusCode::GATEWAY_TIMEOUT);
 
-        let res: Response<Body> = ErrorHttpVersionNotSupported("err").into();
+        let res: HttpResponse = ErrorHttpVersionNotSupported("err").into();
         assert_eq!(res.status(), StatusCode::HTTP_VERSION_NOT_SUPPORTED);
 
-        let res: Response<Body> = ErrorVariantAlsoNegotiates("err").into();
+        let res: HttpResponse = ErrorVariantAlsoNegotiates("err").into();
         assert_eq!(res.status(), StatusCode::VARIANT_ALSO_NEGOTIATES);
 
-        let res: Response<Body> = ErrorInsufficientStorage("err").into();
+        let res: HttpResponse = ErrorInsufficientStorage("err").into();
         assert_eq!(res.status(), StatusCode::INSUFFICIENT_STORAGE);
 
-        let res: Response<Body> = ErrorLoopDetected("err").into();
+        let res: HttpResponse = ErrorLoopDetected("err").into();
         assert_eq!(res.status(), StatusCode::LOOP_DETECTED);
 
-        let res: Response<Body> = ErrorNotExtended("err").into();
+        let res: HttpResponse = ErrorNotExtended("err").into();
         assert_eq!(res.status(), StatusCode::NOT_EXTENDED);
 
-        let res: Response<Body> = ErrorNetworkAuthenticationRequired("err").into();
+        let res: HttpResponse = ErrorNetworkAuthenticationRequired("err").into();
         assert_eq!(res.status(), StatusCode::NETWORK_AUTHENTICATION_REQUIRED);
     }
 }

src/error/macros.rs

@@ -0,0 +1,109 @@
+#[macro_export]
+#[doc(hidden)]
+macro_rules! __downcast_get_type_id {
+    () => {
+        /// A helper method to get the type ID of the type
+        /// this trait is implemented on.
+        /// This method is unsafe to *implement*, since `downcast_ref` relies
+        /// on the returned `TypeId` to perform a cast.
+        ///
+        /// Unfortunately, Rust has no notion of a trait method that is
+        /// unsafe to implement (marking it as `unsafe` makes it unsafe
+        /// to *call*). As a workaround, we require this method
+        /// to return a private type along with the `TypeId`. This
+        /// private type (`PrivateHelper`) has a private constructor,
+        /// making it impossible for safe code to construct outside of
+        /// this module. This ensures that safe code cannot violate
+        /// type-safety by implementing this method.
+        ///
+        /// We also take `PrivateHelper` as a parameter, to ensure that
+        /// safe code cannot obtain a `PrivateHelper` instance by
+        /// delegating to an existing implementation of `__private_get_type_id__`
+        #[doc(hidden)]
+        #[allow(dead_code)]
+        fn __private_get_type_id__(&self, _: PrivateHelper) -> (std::any::TypeId, PrivateHelper)
+        where
+            Self: 'static,
+        {
+            (std::any::TypeId::of::<Self>(), PrivateHelper(()))
+        }
+    };
+}
+
+//Generate implementation for dyn $name
+#[doc(hidden)]
+#[macro_export]
+macro_rules! __downcast_dyn {
+    ($name:ident) => {
+        /// A struct with a private constructor, for use with
+        /// `__private_get_type_id__`. Its single field is private,
+        /// ensuring that it can only be constructed from this module
+        #[doc(hidden)]
+        #[allow(dead_code)]
+        pub struct PrivateHelper(());
+
+        impl dyn $name + 'static {
+            /// Downcasts generic body to a specific type.
+            #[allow(dead_code)]
+            pub fn downcast_ref<T: $name + 'static>(&self) -> Option<&T> {
+                if self.__private_get_type_id__(PrivateHelper(())).0
+                    == std::any::TypeId::of::<T>()
+                {
+                    // SAFETY: external crates cannot override the default
+                    // implementation of `__private_get_type_id__`, since
+                    // it requires returning a private type. We can therefore
+                    // rely on the returned `TypeId`, which ensures that this
+                    // case is correct.
+                    unsafe { Some(&*(self as *const dyn $name as *const T)) }
+                } else {
+                    None
+                }
+            }
+
+            /// Downcasts a generic body to a mutable specific type.
+            #[allow(dead_code)]
+            pub fn downcast_mut<T: $name + 'static>(&mut self) -> Option<&mut T> {
+                if self.__private_get_type_id__(PrivateHelper(())).0
+                    == std::any::TypeId::of::<T>()
+                {
+                    // SAFETY: external crates cannot override the default
+                    // implementation of `__private_get_type_id__`, since
+                    // it requires returning a private type. We can therefore
+                    // rely on the returned `TypeId`, which ensures that this
+                    // case is correct.
+                    unsafe { Some(&mut *(self as *const dyn $name as *const T as *mut T)) }
+                } else {
+                    None
+                }
+            }
+        }
+    };
+}
+
+#[cfg(test)]
+mod tests {
+    #![allow(clippy::upper_case_acronyms)]
+
+    trait MB {
+        __downcast_get_type_id!();
+    }
+
+    __downcast_dyn!(MB);
+
+    impl MB for String {}
+    impl MB for () {}
+
+    #[actix_rt::test]
+    async fn test_any_casting() {
+        let mut body = String::from("hello cast");
+        let resp_body: &mut dyn MB = &mut body;
+        let body = resp_body.downcast_ref::<String>().unwrap();
+        assert_eq!(body, "hello cast");
+        let body = &mut resp_body.downcast_mut::<String>().unwrap();
+        body.push('!');
+        let body = resp_body.downcast_ref::<String>().unwrap();
+        assert_eq!(body, "hello cast!");
+        let not_body = resp_body.downcast_ref::<()>();
+        assert!(not_body.is_none());
+    }
+}

src/error/mod.rs

@@ -9,14 +9,20 @@ use url::ParseError as UrlParseError;
 
 use crate::http::StatusCode;
 
+#[allow(clippy::module_inception)]
+mod error;
 mod internal;
+mod macros;
+mod response_error;
 
+pub use self::error::Error;
 pub use self::internal::*;
+pub use self::response_error::ResponseError;
 
 /// A convenience [`Result`](std::result::Result) for Actix Web operations.
 ///
 /// This type alias is generally used to avoid writing out `actix_http::Error` directly.
-pub type Result<T, E = actix_http::Error> = std::result::Result<T, E>;
+pub type Result<T, E = Error> = std::result::Result<T, E>;
 
 /// Errors which can occur when attempting to generate resource uri.
 #[derive(Debug, PartialEq, Display, Error, From)]

src/error/response_error.rs

@@ -0,0 +1,144 @@
+//! `ResponseError` trait and foreign impls.
+
+use std::{
+    error::Error as StdError,
+    fmt,
+    io::{self, Write as _},
+};
+
+use actix_http::{body::AnyBody, header, Response, StatusCode};
+use bytes::BytesMut;
+
+use crate::{__downcast_dyn, __downcast_get_type_id};
+use crate::{helpers, HttpResponse};
+
+/// Errors that can generate responses.
+// TODO: add std::error::Error bound when replacement for Box<dyn Error> is found
+pub trait ResponseError: fmt::Debug + fmt::Display {
+    /// Returns appropriate status code for error.
+    ///
+    /// A 500 Internal Server Error is used by default. If [error_response](Self::error_response) is
+    /// also implemented and does not call `self.status_code()`, then this will not be used.
+    fn status_code(&self) -> StatusCode {
+        StatusCode::INTERNAL_SERVER_ERROR
+    }
+
+    /// Creates full response for error.
+    ///
+    /// By default, the generated response uses a 500 Internal Server Error status code, a
+    /// `Content-Type` of `text/plain`, and the body is set to `Self`'s `Display` impl.
+    fn error_response(&self) -> HttpResponse {
+        let mut res = HttpResponse::new(self.status_code());
+
+        let mut buf = BytesMut::new();
+        let _ = write!(helpers::MutWriter(&mut buf), "{}", self);
+
+        res.headers_mut().insert(
+            header::CONTENT_TYPE,
+            header::HeaderValue::from_static("text/plain; charset=utf-8"),
+        );
+
+        res.set_body(AnyBody::from(buf))
+    }
+
+    __downcast_get_type_id!();
+}
+
+__downcast_dyn!(ResponseError);
+
+impl ResponseError for Box<dyn StdError + 'static> {}
+
+#[cfg(feature = "openssl")]
+impl ResponseError for actix_tls::accept::openssl::SslError {}
+
+impl ResponseError for serde::de::value::Error {
+    fn status_code(&self) -> StatusCode {
+        StatusCode::BAD_REQUEST
+    }
+}
+
+impl ResponseError for std::str::Utf8Error {
+    fn status_code(&self) -> StatusCode {
+        StatusCode::BAD_REQUEST
+    }
+}
+
+impl ResponseError for std::io::Error {
+    fn status_code(&self) -> StatusCode {
+        // TODO: decide if these errors should consider not found or permission errors
+        match self.kind() {
+            io::ErrorKind::NotFound => StatusCode::NOT_FOUND,
+            io::ErrorKind::PermissionDenied => StatusCode::FORBIDDEN,
+            _ => StatusCode::INTERNAL_SERVER_ERROR,
+        }
+    }
+}
+
+impl ResponseError for actix_http::error::HttpError {}
+
+impl ResponseError for actix_http::Error {
+    fn status_code(&self) -> StatusCode {
+        // TODO: map error kinds to status code better
+        StatusCode::INTERNAL_SERVER_ERROR
+    }
+
+    fn error_response(&self) -> HttpResponse {
+        HttpResponse::new(self.status_code()).set_body(self.to_string().into())
+    }
+}
+
+impl ResponseError for actix_http::header::InvalidHeaderValue {
+    fn status_code(&self) -> StatusCode {
+        StatusCode::BAD_REQUEST
+    }
+}
+
+impl ResponseError for actix_http::error::ParseError {
+    fn status_code(&self) -> StatusCode {
+        StatusCode::BAD_REQUEST
+    }
+}
+
+impl ResponseError for actix_http::error::BlockingError {}
+
+impl ResponseError for actix_http::error::PayloadError {
+    fn status_code(&self) -> StatusCode {
+        match *self {
+            actix_http::error::PayloadError::Overflow => StatusCode::PAYLOAD_TOO_LARGE,
+            _ => StatusCode::BAD_REQUEST,
+        }
+    }
+}
+
+impl ResponseError for actix_http::ws::ProtocolError {}
+
+impl ResponseError for actix_http::error::ContentTypeError {
+    fn status_code(&self) -> StatusCode {
+        StatusCode::BAD_REQUEST
+    }
+}
+
+impl ResponseError for actix_http::ws::HandshakeError {
+    fn error_response(&self) -> HttpResponse {
+        Response::from(self).into()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_error_casting() {
+        use actix_http::error::{ContentTypeError, PayloadError};
+
+        let err = PayloadError::Overflow;
+        let resp_err: &dyn ResponseError = &err;
+
+        let err = resp_err.downcast_ref::<PayloadError>().unwrap();
+        assert_eq!(err.to_string(), "Payload reached size limit.");
+
+        let not_err = resp_err.downcast_ref::<ContentTypeError>();
+        assert!(not_err.is_none());
+    }
+}

src/extract.rs

@@ -47,8 +47,7 @@ pub trait FromRequest: Sized {
 ///
 /// If the FromRequest for T fails, return None rather than returning an error response
 ///
-/// ## Example
+/// # Examples
-///
 /// ```
 /// use actix_web::{web, dev, App, Error, HttpRequest, FromRequest};
 /// use actix_web::error::ErrorBadRequest;
@@ -139,8 +138,7 @@ where
 ///
 /// If the `FromRequest` for T fails, inject Err into handler rather than returning an error response
 ///
-/// ## Example
+/// # Examples
-///
 /// ```
 /// use actix_web::{web, dev, App, Result, Error, HttpRequest, FromRequest};
 /// use actix_web::error::ErrorBadRequest;

src/handler.rs

@@ -3,18 +3,14 @@ use std::marker::PhantomData;
 use std::pin::Pin;
 use std::task::{Context, Poll};
 
-use actix_http::Error;
 use actix_service::{Service, ServiceFactory};
 use actix_utils::future::{ready, Ready};
 use futures_core::ready;
 use pin_project::pin_project;
 
 use crate::{
-    extract::FromRequest,
-    request::HttpRequest,
-    responder::Responder,
-    response::HttpResponse,
     service::{ServiceRequest, ServiceResponse},
+    Error, FromRequest, HttpRequest, HttpResponse, Responder,
 };
 
 /// A request handler is an async function that accepts zero or more parameters that can be

src/helpers.rs

@@ -0,0 +1,25 @@
+use std::io;
+
+use bytes::BufMut;
+
+/// An `io::Write`r that only requires mutable reference and assumes that there is space available
+/// in the buffer for every write operation or that it can be extended implicitly (like
+/// `bytes::BytesMut`, for example).
+///
+/// This is slightly faster (~10%) than `bytes::buf::Writer` in such cases because it does not
+/// perform a remaining length check before writing.
+pub(crate) struct MutWriter<'a, B>(pub(crate) &'a mut B);
+
+impl<'a, B> io::Write for MutWriter<'a, B>
+where
+    B: BufMut,
+{
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        self.0.put_slice(buf);
+        Ok(buf.len())
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+}

src/lib.rs

@@ -1,7 +1,6 @@
 //! Actix Web is a powerful, pragmatic, and extremely fast web framework for Rust.
 //!
-//! ## Example
+//! # Examples
-//!
 //! ```no_run
 //! use actix_web::{get, web, App, HttpServer, Responder};
 //!
@@ -20,8 +19,7 @@
 //! }
 //! ```
 //!
-//! ## Documentation & Community Resources
+//! # Documentation & Community Resources
-//!
 //! In addition to this API documentation, several other resources are available:
 //!
 //! * [Website & User Guide](https://actix.rs/)
@@ -44,8 +42,7 @@
 //!   structs represent HTTP requests and responses and expose methods for creating, inspecting,
 //!   and otherwise utilizing them.
 //!
-//! ## Features
+//! # Features
-//!
 //! * Supports *HTTP/1.x* and *HTTP/2*
 //! * Streaming and pipelining
 //! * Keep-alive and slow requests handling
@@ -59,8 +56,7 @@
 //! * Includes an async [HTTP client](https://docs.rs/awc/)
 //! * Runs on stable Rust 1.46+
 //!
-//! ## Crate Features
+//! # Crate Features
-//!
 //! * `compress` - content encoding compression support (enabled by default)
 //! * `cookies` - cookies support (enabled by default)
 //! * `openssl` - HTTPS support via `openssl` crate, supports `HTTP/2`
@@ -80,6 +76,7 @@ pub mod error;
 mod extract;
 pub mod guard;
 mod handler;
+mod helpers;
 pub mod http;
 mod info;
 pub mod middleware;
@@ -98,7 +95,7 @@ pub(crate) mod types;
 pub mod web;
 
 pub use actix_http::Response as BaseHttpResponse;
-pub use actix_http::{body, Error, HttpMessage, ResponseError};
+pub use actix_http::{body, HttpMessage};
 #[doc(inline)]
 pub use actix_rt as rt;
 pub use actix_web_codegen::*;
@@ -106,7 +103,7 @@ pub use actix_web_codegen::*;
 pub use cookie;
 
 pub use crate::app::App;
-pub use crate::error::Result;
+pub use crate::error::{Error, ResponseError, Result};
 pub use crate::extract::FromRequest;
 pub use crate::request::HttpRequest;
 pub use crate::resource::Resource;
@@ -140,7 +137,9 @@ pub mod dev {
     pub use crate::types::json::JsonBody;
     pub use crate::types::readlines::Readlines;
 
-    pub use actix_http::body::{Body, BodySize, MessageBody, ResponseBody, SizedStream};
+    pub use actix_http::body::{
+        AnyBody, Body, BodySize, MessageBody, ResponseBody, SizedStream,
+    };
     #[cfg(feature = "compress")]
     pub use actix_http::encoding::Decoder as Decompress;
     pub use actix_http::ResponseBuilder as BaseHttpResponseBuilder;

src/middleware/compat.rs

@@ -50,7 +50,7 @@ where
     T: Transform<S, Req>,
     T::Future: 'static,
     T::Response: MapServiceResponseBody,
-    Error: From<T::Error>,
+    T::Error: Into<Error>,
 {
     type Response = ServiceResponse;
     type Error = Error;
@@ -75,7 +75,7 @@ impl<S, Req> Service<Req> for CompatMiddleware<S>
 where
     S: Service<Req>,
     S::Response: MapServiceResponseBody,
-    Error: From<S::Error>,
+    S::Error: Into<Error>,
 {
     type Response = ServiceResponse;
     type Error = Error;
@@ -99,12 +99,16 @@ impl<Fut, T, E> Future for CompatMiddlewareFuture<Fut>
 where
     Fut: Future<Output = Result<T, E>>,
     T: MapServiceResponseBody,
-    Error: From<E>,
+    E: Into<Error>,
 {
     type Output = Result<ServiceResponse, Error>;
 
     fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
-        let res = ready!(self.project().fut.poll(cx))?;
+        let res = match ready!(self.project().fut.poll(cx)) {
+            Ok(res) => res,
+            Err(err) => return Poll::Ready(Err(err.into())),
+        };
+
         Poll::Ready(Ok(res.map_body()))
     }
 }

src/middleware/compress.rs

@@ -13,7 +13,6 @@ use actix_http::{
     body::{MessageBody, ResponseBody},
     encoding::Encoder,
     http::header::{ContentEncoding, ACCEPT_ENCODING},
-    Error,
 };
 use actix_service::{Service, Transform};
 use actix_utils::future::{ok, Ready};
@@ -23,6 +22,7 @@ use pin_project::pin_project;
 use crate::{
     dev::BodyEncoding,
     service::{ServiceRequest, ServiceResponse},
+    Error,
 };
 
 /// Middleware for compressing response payloads.

src/middleware/err_handlers.rs

@@ -13,8 +13,8 @@ use futures_core::{future::LocalBoxFuture, ready};
 
 use crate::{
     dev::{ServiceRequest, ServiceResponse},
-    error::{Error, Result},
     http::StatusCode,
+    Error, Result,
 };
 
 /// Return type for [`ErrorHandlers`] custom handlers.

src/request.rs

@@ -7,7 +7,7 @@ use std::{
 
 use actix_http::{
     http::{HeaderMap, Method, Uri, Version},
-    Error, Extensions, HttpMessage, Message, Payload, RequestHead,
+    Extensions, HttpMessage, Message, Payload, RequestHead,
 };
 use actix_router::{Path, Url};
 use actix_utils::future::{ok, Ready};
@@ -17,7 +17,7 @@ use smallvec::SmallVec;
 
 use crate::{
     app_service::AppInitServiceState, config::AppConfig, error::UrlGenerationError,
-    extract::FromRequest, info::ConnectionInfo, rmap::ResourceMap,
+    info::ConnectionInfo, rmap::ResourceMap, Error, FromRequest,
 };
 
 #[cfg(feature = "cookies")]
@@ -356,8 +356,7 @@ impl Drop for HttpRequest {
 
 /// It is possible to get `HttpRequest` as an extractor handler parameter
 ///
-/// ## Example
+/// # Examples
-///
 /// ```
 /// use actix_web::{web, App, HttpRequest};
 /// use serde_derive::Deserialize;

src/request_data.rs

@@ -1,9 +1,8 @@
 use std::{any::type_name, ops::Deref};
 
-use actix_http::error::Error;
 use actix_utils::future::{err, ok, Ready};
 
-use crate::{dev::Payload, error::ErrorInternalServerError, FromRequest, HttpRequest};
+use crate::{dev::Payload, error::ErrorInternalServerError, Error, FromRequest, HttpRequest};
 
 /// Request-local data extractor.
 ///

src/resource.rs

@@ -3,7 +3,7 @@ use std::fmt;
 use std::future::Future;
 use std::rc::Rc;
 
-use actix_http::{Error, Extensions};
+use actix_http::Extensions;
 use actix_router::IntoPattern;
 use actix_service::boxed::{self, BoxService, BoxServiceFactory};
 use actix_service::{
@@ -13,14 +13,16 @@ use actix_service::{
 use futures_core::future::LocalBoxFuture;
 use futures_util::future::join_all;
 
-use crate::dev::{insert_slash, AppService, HttpServiceFactory, ResourceDef};
+use crate::{
-use crate::extract::FromRequest;
+    data::Data,
-use crate::guard::Guard;
+    dev::{insert_slash, AppService, HttpServiceFactory, ResourceDef},
-use crate::handler::Handler;
+    guard::Guard,
-use crate::responder::Responder;
+    handler::Handler,
-use crate::route::{Route, RouteService};
+    responder::Responder,
-use crate::service::{ServiceRequest, ServiceResponse};
+    route::{Route, RouteService},
-use crate::{data::Data, HttpResponse};
+    service::{ServiceRequest, ServiceResponse},
+    Error, FromRequest, HttpResponse,
+};
 
 type HttpService = BoxService<ServiceRequest, ServiceResponse, Error>;
 type HttpNewService = BoxServiceFactory<(), ServiceRequest, ServiceResponse, Error, ()>;

src/responder.rs

@@ -1,4 +1,4 @@
-use std::{borrow::Cow, fmt};
+use std::borrow::Cow;
 
 use actix_http::{
     body::Body,
@@ -6,7 +6,7 @@ use actix_http::{
 };
 use bytes::{Bytes, BytesMut};
 
-use crate::{error::InternalError, Error, HttpRequest, HttpResponse, HttpResponseBuilder};
+use crate::{Error, HttpRequest, HttpResponse, HttpResponseBuilder};
 
 /// Trait implemented by types that can be converted to an HTTP response.
 ///
@@ -226,15 +226,6 @@ impl<T: Responder> Responder for CustomResponder<T> {
     }
 }
 
-impl<T> Responder for InternalError<T>
-where
-    T: fmt::Debug + fmt::Display + 'static,
-{
-    fn respond_to(self, _: &HttpRequest) -> HttpResponse {
-        HttpResponse::from_error(self.into())
-    }
-}
-
 #[cfg(test)]
 pub(crate) mod tests {
     use actix_service::Service;

src/response/builder.rs

@@ -1,13 +1,14 @@
 use std::{
     cell::{Ref, RefMut},
     convert::TryInto,
+    error::Error as StdError,
     future::Future,
     pin::Pin,
     task::{Context, Poll},
 };
 
 use actix_http::{
-    body::{Body, BodyStream},
+    body::{AnyBody, BodyStream},
     http::{
         header::{self, HeaderName, IntoHeaderPair, IntoHeaderValue},
         ConnectionType, Error as HttpError, StatusCode,
@@ -32,7 +33,7 @@ use crate::{
 ///
 /// This type can be used to construct an instance of `Response` through a builder-like pattern.
 pub struct HttpResponseBuilder {
-    res: Option<Response<Body>>,
+    res: Option<Response<AnyBody>>,
     err: Option<HttpError>,
     #[cfg(feature = "cookies")]
     cookies: Option<CookieJar>,
@@ -310,7 +311,7 @@ impl HttpResponseBuilder {
     ///
     /// `HttpResponseBuilder` can not be used after this call.
     #[inline]
-    pub fn body<B: Into<Body>>(&mut self, body: B) -> HttpResponse<Body> {
+    pub fn body<B: Into<AnyBody>>(&mut self, body: B) -> HttpResponse<AnyBody> {
         match self.message_body(body.into()) {
             Ok(res) => res,
             Err(err) => HttpResponse::from_error(err),
@@ -354,9 +355,9 @@ impl HttpResponseBuilder {
     pub fn streaming<S, E>(&mut self, stream: S) -> HttpResponse
     where
         S: Stream<Item = Result<Bytes, E>> + Unpin + 'static,
-        E: Into<Error> + 'static,
+        E: Into<Box<dyn StdError>> + 'static,
     {
-        self.body(Body::from_message(BodyStream::new(stream)))
+        self.body(AnyBody::from_message(BodyStream::new(stream)))
     }
 
     /// Set a json body and generate `Response`
@@ -375,9 +376,9 @@ impl HttpResponseBuilder {
                     self.insert_header((header::CONTENT_TYPE, mime::APPLICATION_JSON));
                 }
 
-                self.body(Body::from(body))
+                self.body(AnyBody::from(body))
             }
-            Err(err) => HttpResponse::from_error(JsonPayloadError::Serialize(err).into()),
+            Err(err) => HttpResponse::from_error(JsonPayloadError::Serialize(err)),
         }
     }
 
@@ -386,7 +387,7 @@ impl HttpResponseBuilder {
     /// `HttpResponseBuilder` can not be used after this call.
     #[inline]
     pub fn finish(&mut self) -> HttpResponse {
-        self.body(Body::Empty)
+        self.body(AnyBody::Empty)
     }
 
     /// This method construct new `HttpResponseBuilder`
@@ -415,7 +416,7 @@ impl From<HttpResponseBuilder> for HttpResponse {
     }
 }
 
-impl From<HttpResponseBuilder> for Response<Body> {
+impl From<HttpResponseBuilder> for Response<AnyBody> {
     fn from(mut builder: HttpResponseBuilder) -> Self {
         builder.finish().into()
     }

src/response/response.rs

@@ -8,7 +8,7 @@ use std::{
 };
 
 use actix_http::{
-    body::{Body, MessageBody},
+    body::{AnyBody, Body, MessageBody},
     http::{header::HeaderMap, StatusCode},
     Extensions, Response, ResponseHead,
 };
@@ -25,12 +25,12 @@ use {
 use crate::{error::Error, HttpResponseBuilder};
 
 /// An HTTP Response
-pub struct HttpResponse<B = Body> {
+pub struct HttpResponse<B = AnyBody> {
     res: Response<B>,
     pub(crate) error: Option<Error>,
 }
 
-impl HttpResponse<Body> {
+impl HttpResponse<AnyBody> {
     /// Create HTTP response builder with specific status.
     #[inline]
     pub fn build(status: StatusCode) -> HttpResponseBuilder {
@@ -48,13 +48,8 @@ impl HttpResponse<Body> {
 
     /// Create an error response.
     #[inline]
-    pub fn from_error(error: Error) -> Self {
+    pub fn from_error(error: impl Into<Error>) -> Self {
-        let res = error.as_response_error().error_response();
+        error.into().as_response_error().error_response()
-
-        Self {
-            res,
-            error: Some(error),
-        }
     }
 }
 
@@ -238,7 +233,6 @@ impl<B> HttpResponse<B> {
 impl<B> fmt::Debug for HttpResponse<B>
 where
     B: MessageBody,
-    B::Error: Into<Error>,
 {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.debug_struct("HttpResponse")

src/route.rs

@@ -2,19 +2,19 @@
 
 use std::{future::Future, rc::Rc};
 
-use actix_http::{http::Method, Error};
+use actix_http::http::Method;
 use actix_service::{
     boxed::{self, BoxService, BoxServiceFactory},
     Service, ServiceFactory,
 };
 use futures_core::future::LocalBoxFuture;
 
-use crate::extract::FromRequest;
+use crate::{
-use crate::guard::{self, Guard};
+    guard::{self, Guard},
-use crate::handler::{Handler, HandlerService};
+    handler::{Handler, HandlerService},
-use crate::responder::Responder;
+    service::{ServiceRequest, ServiceResponse},
-use crate::service::{ServiceRequest, ServiceResponse};
+    Error, FromRequest, HttpResponse, Responder,
-use crate::HttpResponse;
+};
 
 /// Resource route definition
 ///
@@ -188,7 +188,7 @@ impl Route {
 
 #[cfg(test)]
 mod tests {
-    use std::time::Duration;
+    use std::{convert::Infallible, time::Duration};
 
     use actix_rt::time::sleep;
     use bytes::Bytes;
@@ -215,7 +215,7 @@ mod tests {
                         }))
                         .route(web::post().to(|| async {
                             sleep(Duration::from_millis(100)).await;
-                            Ok::<_, ()>(HttpResponse::Created())
+                            Ok::<_, Infallible>(HttpResponse::Created())
                         }))
                         .route(web::delete().to(|| async {
                             sleep(Duration::from_millis(100)).await;

src/server.rs

@@ -1,23 +1,25 @@
 use std::{
     any::Any,
-    cmp, fmt, io,
+    cmp,
+    error::Error as StdError,
+    fmt, io,
     marker::PhantomData,
     net,
     sync::{Arc, Mutex},
 };
 
-use actix_http::{
+use actix_http::{body::MessageBody, Extensions, HttpService, KeepAlive, Request, Response};
-    body::MessageBody, Error, Extensions, HttpService, KeepAlive, Request, Response,
-};
 use actix_server::{Server, ServerBuilder};
-use actix_service::{map_config, IntoServiceFactory, Service, ServiceFactory};
+use actix_service::{
+    map_config, IntoServiceFactory, Service, ServiceFactory, ServiceFactoryExt as _,
+};
 
 #[cfg(feature = "openssl")]
 use actix_tls::accept::openssl::{AlpnError, SslAcceptor, SslAcceptorBuilder};
 #[cfg(feature = "rustls")]
 use actix_tls::accept::rustls::ServerConfig as RustlsServerConfig;
 
-use crate::config::AppConfig;
+use crate::{config::AppConfig, Error};
 
 struct Socket {
     scheme: &'static str,
@@ -81,7 +83,7 @@ where
     S::Service: 'static,
     // S::Service: 'static,
     B: MessageBody + 'static,
-    B::Error: Into<Error>,
+    B::Error: Into<Box<dyn StdError>>,
 {
     /// Create new HTTP server with application factory
     pub fn new(factory: F) -> Self {
@@ -301,7 +303,11 @@ where
                         svc
                     };
 
-                    svc.finish(map_config(factory(), move |_| {
+                    let fac = factory()
+                        .into_factory()
+                        .map_err(|err| err.into().error_response());
+
+                    svc.finish(map_config(fac, move |_| {
                         AppConfig::new(false, host.clone(), addr)
                     }))
                     .tcp()
@@ -356,7 +362,11 @@ where
                         svc
                     };
 
-                    svc.finish(map_config(factory(), move |_| {
+                    let fac = factory()
+                        .into_factory()
+                        .map_err(|err| err.into().error_response());
+
+                    svc.finish(map_config(fac, move |_| {
                         AppConfig::new(true, host.clone(), addr)
                     }))
                     .openssl(acceptor.clone())
@@ -410,7 +420,11 @@ where
                         svc
                     };
 
-                    svc.finish(map_config(factory(), move |_| {
+                    let fac = factory()
+                        .into_factory()
+                        .map_err(|err| err.into().error_response());
+
+                    svc.finish(map_config(fac, move |_| {
                         AppConfig::new(true, host.clone(), addr)
                     }))
                     .rustls(config.clone())
@@ -533,7 +547,11 @@ where
                     svc
                 };
 
-                svc.finish(map_config(factory(), move |_| config.clone()))
+                let fac = factory()
+                    .into_factory()
+                    .map_err(|err| err.into().error_response());
+
+                svc.finish(map_config(fac, move |_| config.clone()))
             })
         })?;
         Ok(self)
@@ -568,14 +586,20 @@ where
                     c.host.clone().unwrap_or_else(|| format!("{}", socket_addr)),
                     socket_addr,
                 );
+
+                let fac = factory()
+                    .into_factory()
+                    .map_err(|err| err.into().error_response());
+
                 fn_service(|io: UnixStream| async { Ok((io, Protocol::Http1, None)) }).and_then(
                     HttpService::build()
                         .keep_alive(c.keep_alive)
                         .client_timeout(c.client_timeout)
-                        .finish(map_config(factory(), move |_| config.clone())),
+                        .finish(map_config(fac, move |_| config.clone())),
                 )
             },
         )?;
+
         Ok(self)
     }
 }

src/service.rs

@@ -2,24 +2,24 @@ use std::cell::{Ref, RefMut};
 use std::rc::Rc;
 use std::{fmt, net};
 
-use actix_http::body::{Body, MessageBody};
-use actix_http::http::{HeaderMap, Method, StatusCode, Uri, Version};
 use actix_http::{
-    Error, Extensions, HttpMessage, Payload, PayloadStream, RequestHead, Response, ResponseHead,
+    body::{AnyBody, MessageBody},
+    http::{HeaderMap, Method, StatusCode, Uri, Version},
+    Extensions, HttpMessage, Payload, PayloadStream, RequestHead, Response, ResponseHead,
 };
 use actix_router::{IntoPattern, Path, Resource, ResourceDef, Url};
 use actix_service::{IntoServiceFactory, ServiceFactory};
 #[cfg(feature = "cookies")]
 use cookie::{Cookie, ParseError as CookieParseError};
 
-use crate::dev::insert_slash;
-use crate::guard::Guard;
-use crate::info::ConnectionInfo;
-use crate::request::HttpRequest;
-use crate::rmap::ResourceMap;
 use crate::{
     config::{AppConfig, AppService},
-    HttpResponse,
+    dev::insert_slash,
+    guard::Guard,
+    info::ConnectionInfo,
+    request::HttpRequest,
+    rmap::ResourceMap,
+    Error, HttpResponse,
 };
 
 pub trait HttpServiceFactory {
@@ -330,15 +330,15 @@ impl fmt::Debug for ServiceRequest {
     }
 }
 
-pub struct ServiceResponse<B = Body> {
+pub struct ServiceResponse<B = AnyBody> {
     request: HttpRequest,
     response: HttpResponse<B>,
 }
 
-impl ServiceResponse<Body> {
+impl ServiceResponse<AnyBody> {
     /// Create service response from the error
     pub fn from_err<E: Into<Error>>(err: E, request: HttpRequest) -> Self {
-        let response = HttpResponse::from_error(err.into());
+        let response = HttpResponse::from_error(err);
         ServiceResponse { request, response }
     }
 }

src/types/form.rs

@@ -188,7 +188,7 @@ impl<T: Serialize> Responder for Form<T> {
             Ok(body) => HttpResponse::Ok()
                 .content_type(mime::APPLICATION_WWW_FORM_URLENCODED)
                 .body(body),
-            Err(err) => HttpResponse::from_error(UrlencodedError::Serialize(err).into()),
+            Err(err) => HttpResponse::from_error(UrlencodedError::Serialize(err)),
         }
     }
 }

src/types/json.rs

@@ -127,7 +127,7 @@ impl<T: Serialize> Responder for Json<T> {
             Ok(body) => HttpResponse::Ok()
                 .content_type(mime::APPLICATION_JSON)
                 .body(body),
-            Err(err) => HttpResponse::from_error(JsonPayloadError::Serialize(err).into()),
+            Err(err) => HttpResponse::from_error(JsonPayloadError::Serialize(err)),
         }
     }
 }
@@ -500,7 +500,7 @@ mod tests {
                 };
                 let resp =
                     HttpResponse::BadRequest().body(serde_json::to_string(&msg).unwrap());
-                InternalError::from_response(err, resp.into()).into()
+                InternalError::from_response(err, resp).into()
             }))
             .to_http_parts();
 

src/types/path.rs

@@ -2,14 +2,13 @@
 
 use std::{fmt, ops, sync::Arc};
 
-use actix_http::error::Error;
 use actix_router::PathDeserializer;
 use actix_utils::future::{ready, Ready};
 use serde::de;
 
 use crate::{
     dev::Payload,
-    error::{ErrorNotFound, PathError},
+    error::{Error, ErrorNotFound, PathError},
     FromRequest, HttpRequest,
 };
 
@@ -296,11 +295,8 @@ mod tests {
     async fn test_custom_err_handler() {
         let (req, mut pl) = TestRequest::with_uri("/name/user1/")
             .app_data(PathConfig::default().error_handler(|err, _| {
-                error::InternalError::from_response(
+                error::InternalError::from_response(err, HttpResponse::Conflict().finish())
-                    err,
+                    .into()
-                    HttpResponse::Conflict().finish().into(),
-                )
-                .into()
             }))
             .to_http_parts();
 

src/types/query.rs

@@ -267,7 +267,7 @@ mod tests {
         let req = TestRequest::with_uri("/name/user1/")
             .app_data(QueryConfig::default().error_handler(|e, _| {
                 let resp = HttpResponse::UnprocessableEntity().finish();
-                InternalError::from_response(e, resp.into()).into()
+                InternalError::from_response(e, resp).into()
             }))
             .to_srv_request();