diff --git a/CHANGES.md b/CHANGES.md
index d0f2188a..88295ec1 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,6 +1,10 @@
 # Changes
 
 ## Unreleased - 2021-xx-xx
+### Added
+* Re-export actix-service `ServiceFactory` in `dev` module. [#2325]
+
+[#2325]: https://github.com/actix/actix-web/pull/2325
 
 
 ## 4.0.0-beta.8 - 2021-06-26
diff --git a/actix-http/src/request.rs b/actix-http/src/request.rs
index 09c6dd29..401e9745 100644
--- a/actix-http/src/request.rs
+++ b/actix-http/src/request.rs
@@ -15,7 +15,7 @@ use crate::{
     HttpMessage,
 };
 
-/// Request
+/// An HTTP request.
 pub struct Request<P = PayloadStream> {
     pub(crate) payload: Payload<P>,
     pub(crate) head: Message<RequestHead>,
diff --git a/src/dev.rs b/src/dev.rs
index a656604e..b8d95efb 100644
--- a/src/dev.rs
+++ b/src/dev.rs
@@ -1,13 +1,7 @@
-//! Lower level `actix-web` types.
+//! Lower-level types and re-exports.
 //!
-//! Most users will not have to interact with the types in this module,
-//! but it is useful as a glob import for those writing middleware, developing libraries,
-//! or interacting with the service API directly:
-//!
-//! ```
-//! # #![allow(unused_imports)]
-//! use actix_web::dev::*;
-//! ```
+//! Most users will not have to interact with the types in this module, but it is useful for those
+//! writing extractors, middleware and libraries, or interacting with the service API directly.
 
 pub use crate::config::{AppConfig, AppService};
 #[doc(hidden)]
@@ -24,26 +18,25 @@ pub use actix_http::body::{AnyBody, Body, BodySize, MessageBody, ResponseBody, S
 
 #[cfg(feature = "__compress")]
 pub use actix_http::encoding::Decoder as Decompress;
-pub use actix_http::ResponseBuilder as BaseHttpResponseBuilder;
 pub use actix_http::{Extensions, Payload, PayloadStream, RequestHead, ResponseHead};
 pub use actix_router::{Path, ResourceDef, ResourcePath, Url};
 pub use actix_server::Server;
 pub use actix_service::{
-    always_ready, fn_factory, fn_service, forward_ready, Service, Transform,
+    always_ready, fn_factory, fn_service, forward_ready, Service, ServiceFactory, Transform,
 };
 
-pub(crate) fn insert_slash(mut patterns: Vec<String>) -> Vec<String> {
+use crate::http::header::ContentEncoding;
+use actix_http::{Response, ResponseBuilder};
+
+pub(crate) fn insert_leading_slash(mut patterns: Vec<String>) -> Vec<String> {
     for path in &mut patterns {
         if !path.is_empty() && !path.starts_with('/') {
             path.insert(0, '/');
         };
     }
+
     patterns
 }
-
-use crate::http::header::ContentEncoding;
-use actix_http::{Response, ResponseBuilder};
-
 struct Enc(ContentEncoding);
 
 /// Helper trait that allows to set specific encoding for response.
diff --git a/src/request.rs b/src/request.rs
index 36d9aba9..4b950e75 100644
--- a/src/request.rs
+++ b/src/request.rs
@@ -23,10 +23,10 @@ use crate::{
 #[cfg(feature = "cookies")]
 struct Cookies(Vec<Cookie<'static>>);
 
+/// An incoming request.
 #[derive(Clone)]
-/// An HTTP Request
 pub struct HttpRequest {
-    /// # Panics
+    /// # Invariant
     /// `Rc<HttpRequestInner>` is used exclusively and NO `Weak<HttpRequestInner>`
     /// is allowed anywhere in the code. Weak pointer is purposely ignored when
     /// doing `Rc`'s ref counter check. Expect panics if this invariant is violated.
diff --git a/src/resource.rs b/src/resource.rs
index 4e609f31..20d1ee17 100644
--- a/src/resource.rs
+++ b/src/resource.rs
@@ -15,7 +15,7 @@ use futures_util::future::join_all;
 
 use crate::{
     data::Data,
-    dev::{insert_slash, AppService, HttpServiceFactory, ResourceDef},
+    dev::{insert_leading_slash, AppService, HttpServiceFactory, ResourceDef},
     guard::Guard,
     handler::Handler,
     responder::Responder,
@@ -391,7 +391,7 @@ where
         };
 
         let mut rdef = if config.is_root() || !self.rdef.is_empty() {
-            ResourceDef::new(insert_slash(self.rdef.clone()))
+            ResourceDef::new(insert_leading_slash(self.rdef.clone()))
         } else {
             ResourceDef::new(self.rdef.clone())
         };
diff --git a/src/response/response.rs b/src/response/response.rs
index 9a3bb287..09515c83 100644
--- a/src/response/response.rs
+++ b/src/response/response.rs
@@ -24,20 +24,14 @@ use {
 
 use crate::{error::Error, HttpResponseBuilder};
 
-/// An HTTP Response
+/// An outgoing response.
 pub struct HttpResponse<B = AnyBody> {
     res: Response<B>,
     pub(crate) error: Option<Error>,
 }
 
 impl HttpResponse<AnyBody> {
-    /// Create HTTP response builder with specific status.
-    #[inline]
-    pub fn build(status: StatusCode) -> HttpResponseBuilder {
-        HttpResponseBuilder::new(status)
-    }
-
-    /// Create a response.
+    /// Constructs a response.
     #[inline]
     pub fn new(status: StatusCode) -> Self {
         Self {
@@ -46,6 +40,12 @@ impl HttpResponse<AnyBody> {
         }
     }
 
+    /// Constructs a response builder with specific HTTP status.
+    #[inline]
+    pub fn build(status: StatusCode) -> HttpResponseBuilder {
+        HttpResponseBuilder::new(status)
+    }
+
     /// Create an error response.
     #[inline]
     pub fn from_error(error: impl Into<Error>) -> Self {
diff --git a/src/service.rs b/src/service.rs
index c1bffac4..47e7e4ac 100644
--- a/src/service.rs
+++ b/src/service.rs
@@ -14,7 +14,7 @@ use cookie::{Cookie, ParseError as CookieParseError};
 
 use crate::{
     config::{AppConfig, AppService},
-    dev::insert_slash,
+    dev::insert_leading_slash,
     guard::Guard,
     info::ConnectionInfo,
     rmap::ResourceMap,
@@ -59,9 +59,9 @@ where
     }
 }
 
-/// An service http request
+/// A service level request wrapper.
 ///
-/// ServiceRequest allows mutable access to request's internal structures
+/// Allows mutable access to request's internal structures.
 pub struct ServiceRequest {
     req: HttpRequest,
     payload: Payload,
@@ -325,6 +325,7 @@ impl fmt::Debug for ServiceRequest {
     }
 }
 
+/// A service level response wrapper.
 pub struct ServiceResponse<B = AnyBody> {
     request: HttpRequest,
     response: HttpResponse<B>,
@@ -550,7 +551,7 @@ where
         };
 
         let mut rdef = if config.is_root() || !self.rdef.is_empty() {
-            ResourceDef::new(insert_slash(self.rdef))
+            ResourceDef::new(insert_leading_slash(self.rdef))
         } else {
             ResourceDef::new(self.rdef)
         };