diff --git a/actix-http/CHANGES.md b/actix-http/CHANGES.md
index afc988d43..c28013853 100644
--- a/actix-http/CHANGES.md
+++ b/actix-http/CHANGES.md
@@ -1,14 +1,17 @@
 # Changes
 
 ## Unreleased - 2021-xx-xx
+### Added
+- Implement `From<Vec<u8>>` for `Response<Vec<u8>>`. [#2625]
+
 ### Changed
 - `error::DispatcherError` enum is now marked `#[non_exhaustive]`. [#2624]
 
-
 ### Fixed
 - Issue where handlers that took payload but then dropped without reading it to EOF it would cause keep-alive connections to become stuck. [#2624]
 
 [#2624]: https://github.com/actix/actix-web/pull/2624
+[#2625]: https://github.com/actix/actix-web/pull/2625
 
 
 ## 3.0.0-rc.1 - 2022-01-31
diff --git a/actix-http/src/config.rs b/actix-http/src/config.rs
index 8045910be..ac95a2802 100644
--- a/actix-http/src/config.rs
+++ b/actix-http/src/config.rs
@@ -104,8 +104,13 @@ impl ServiceConfig {
         self.0.date_service.now()
     }
 
-    pub(crate) fn write_date_header(&self, dst: &mut BytesMut, camel_case: bool) {
-        let mut buf: [u8; 39] = [0; 39];
+    /// Writes date header to `dst` buffer.
+    ///
+    /// Low-level method that utilizes the built-in efficient date service, requiring fewer syscalls
+    /// than normal. Note that a CRLF (`\r\n`) is included in what is written.
+    #[doc(hidden)]
+    pub fn write_date_header(&self, dst: &mut BytesMut, camel_case: bool) {
+        let mut buf: [u8; 37] = [0; 37];
 
         buf[..6].copy_from_slice(if camel_case { b"Date: " } else { b"date: " });
 
@@ -113,7 +118,7 @@ impl ServiceConfig {
             .date_service
             .with_date(|date| buf[6..35].copy_from_slice(&date.bytes));
 
-        buf[35..].copy_from_slice(b"\r\n\r\n");
+        buf[35..].copy_from_slice(b"\r\n");
         dst.extend_from_slice(&buf);
     }
 
diff --git a/actix-http/src/h1/encoder.rs b/actix-http/src/h1/encoder.rs
index a24ba5911..ba98f4641 100644
--- a/actix-http/src/h1/encoder.rs
+++ b/actix-http/src/h1/encoder.rs
@@ -210,14 +210,14 @@ pub(crate) trait MessageType: Sized {
             dst.advance_mut(pos);
         }
 
-        // optimized date header, set_date writes \r\n
         if !has_date {
+            // optimized date header, write_date_header writes its own \r\n
             config.write_date_header(dst, camel_case);
-        } else {
-            // msg eof
-            dst.extend_from_slice(b"\r\n");
         }
 
+        // end-of-headers marker
+        dst.extend_from_slice(b"\r\n");
+
         Ok(())
     }
 
diff --git a/actix-http/src/responses/response.rs b/actix-http/src/responses/response.rs
index da5503c1c..ceb158f65 100644
--- a/actix-http/src/responses/response.rs
+++ b/actix-http/src/responses/response.rs
@@ -285,6 +285,24 @@ impl From<&'static [u8]> for Response<&'static [u8]> {
     }
 }
 
+impl From<Vec<u8>> for Response<Vec<u8>> {
+    fn from(val: Vec<u8>) -> Self {
+        let mut res = Response::with_body(StatusCode::OK, val);
+        let mime = mime::APPLICATION_OCTET_STREAM.try_into_value().unwrap();
+        res.headers_mut().insert(header::CONTENT_TYPE, mime);
+        res
+    }
+}
+
+impl From<&Vec<u8>> for Response<Vec<u8>> {
+    fn from(val: &Vec<u8>) -> Self {
+        let mut res = Response::with_body(StatusCode::OK, val.clone());
+        let mime = mime::APPLICATION_OCTET_STREAM.try_into_value().unwrap();
+        res.headers_mut().insert(header::CONTENT_TYPE, mime);
+        res
+    }
+}
+
 impl From<String> for Response<String> {
     fn from(val: String) -> Self {
         let mut res = Response::with_body(StatusCode::OK, val);
diff --git a/actix-web/CHANGES.md b/actix-web/CHANGES.md
index 7ce282c8b..37fe6ca6a 100644
--- a/actix-web/CHANGES.md
+++ b/actix-web/CHANGES.md
@@ -1,6 +1,11 @@
 # Changes
 
 ## Unreleased - 2021-xx-xx
+### Added
+- Implement `Responder` for `Vec<u8>`. [#2625]
+- Re-export `KeepAlive` in `http` mod. [#2625]
+
+[#2625]: https://github.com/actix/actix-web/pull/2625
 
 
 ## 4.0.0-rc.2 - 2022-02-02
diff --git a/actix-web/src/http/mod.rs b/actix-web/src/http/mod.rs
index 2581532cd..91c0ca377 100644
--- a/actix-web/src/http/mod.rs
+++ b/actix-web/src/http/mod.rs
@@ -3,4 +3,4 @@
 pub mod header;
 
 // TODO: figure out how best to expose http::Error vs actix_http::Error
-pub use actix_http::{uri, ConnectionType, Error, Method, StatusCode, Uri, Version};
+pub use actix_http::{uri, ConnectionType, Error, KeepAlive, Method, StatusCode, Uri, Version};
diff --git a/actix-web/src/response/responder.rs b/actix-web/src/response/responder.rs
index d1b9e49e0..cb71369cf 100644
--- a/actix-web/src/response/responder.rs
+++ b/actix-web/src/response/responder.rs
@@ -132,6 +132,7 @@ macro_rules! impl_responder_by_forward_into_base_response {
 }
 
 impl_responder_by_forward_into_base_response!(&'static [u8]);
+impl_responder_by_forward_into_base_response!(Vec<u8>);
 impl_responder_by_forward_into_base_response!(Bytes);
 impl_responder_by_forward_into_base_response!(BytesMut);