diff --git a/CHANGES.md b/CHANGES.md
index 28dfb093e..a82d33611 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -11,6 +11,7 @@
 * `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>>`. [#2224]
+* All error trait bounds in message body and stream impls changed from `Into<Error>` to `Into<Box<dyn std::error::Error>>`. [#2224]
 
 ### Removed
 * `HttpResponse::take_body` and old `HttpResponse::into_body` method that casted body type. [#2201]
diff --git a/actix-http/CHANGES.md b/actix-http/CHANGES.md
index f3d0aab45..9a190aad8 100644
--- a/actix-http/CHANGES.md
+++ b/actix-http/CHANGES.md
@@ -13,6 +13,7 @@
 ### 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>>`. [#2224]
+* All error trait bounds in message body and stream impls changed from `Into<Error>` to `Into<Box<dyn std::error::Error>>`. [#2224]
 * 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]
diff --git a/actix-http/src/body/body.rs b/actix-http/src/body/body.rs
index 3fda8ae11..3840a327a 100644
--- a/actix-http/src/body/body.rs
+++ b/actix-http/src/body/body.rs
@@ -174,7 +174,7 @@ 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)
diff --git a/actix-http/src/body/body_stream.rs b/actix-http/src/body/body_stream.rs
index ebe872022..aaf0dd8f6 100644
--- a/actix-http/src/body/body_stream.rs
+++ b/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);
@@ -66,6 +65,8 @@ where
 
 #[cfg(test)]
 mod tests {
+    use std::convert::Infallible;
+
     use actix_rt::pin;
     use actix_utils::future::poll_fn;
     use futures_util::stream;
@@ -78,7 +79,7 @@ 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);
 
@@ -103,7 +104,7 @@ 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))),
         ));
 
         assert_eq!(to_bytes(body).await.ok(), Some(Bytes::from("12")));
diff --git a/actix-http/src/body/sized_stream.rs b/actix-http/src/body/sized_stream.rs
index 4af132389..b6ceb32fe 100644
--- a/actix-http/src/body/sized_stream.rs
+++ b/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
-    /// without using transfer encoding.
+    /// This body implementation should be used if total size of stream is known. Data is sent as-is
+    /// 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")));
diff --git a/actix-http/src/error.rs b/actix-http/src/error.rs
index bc573fc1d..b9b58b7d9 100644
--- a/actix-http/src/error.rs
+++ b/actix-http/src/error.rs
@@ -90,7 +90,7 @@ impl fmt::Debug for Error {
     }
 }
 
-impl std::error::Error for Error {
+impl StdError for Error {
     fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
         None
     }
diff --git a/actix-http/src/response_builder.rs b/actix-http/src/response_builder.rs
index f4b76382b..38a4c8819 100644
--- a/actix-http/src/response_builder.rs
+++ b/actix-http/src/response_builder.rs
@@ -2,6 +2,7 @@
 
 use std::{
     cell::{Ref, RefMut},
+    error::Error as StdError,
     fmt,
     future::Future,
     pin::Pin,
@@ -259,7 +260,7 @@ impl ResponseBuilder {
     pub fn streaming<S, E>(&mut self, stream: S) -> Response<Body>
     where
         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)))
     }
diff --git a/actix-http/tests/test_openssl.rs b/actix-http/tests/test_openssl.rs
index 291c72593..1e817175f 100644
--- a/actix-http/tests/test_openssl.rs
+++ b/actix-http/tests/test_openssl.rs
@@ -2,7 +2,7 @@
 
 extern crate tls_openssl as openssl;
 
-use std::io;
+use std::{convert::Infallible, io};
 
 use actix_http::{
     body::{AnyBody, Body, SizedStream},
@@ -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(|_| {
-                let body = once(ok(Bytes::from_static(STR.as_ref())));
-                ok::<_, ()>(
+            .h2(|_| async {
+                let body = once(async {
+                    Ok::<_, Infallible>(Bytes::from_static(STR.as_ref()))
+                });
+
+                Ok::<_, Infallible>(
                     Response::ok().set_body(SizedStream::new(STR.len() as u64, body)),
                 )
             })
diff --git a/actix-http/tests/test_rustls.rs b/actix-http/tests/test_rustls.rs
index 8ee72d731..f8d107d9d 100644
--- a/actix-http/tests/test_rustls.rs
+++ b/actix-http/tests/test_rustls.rs
@@ -2,6 +2,11 @@
 
 extern crate tls_rustls as rustls;
 
+use std::{
+    convert::Infallible,
+    io::{self, BufReader},
+};
+
 use actix_http::{
     body::{AnyBody, Body, SizedStream},
     error::PayloadError,
@@ -23,8 +28,6 @@ use rustls::{
     NoClientAuth, ServerConfig as RustlsServerConfig,
 };
 
-use std::io::{self, BufReader};
-
 async fn load_body<S>(mut stream: S) -> Result<BytesMut, PayloadError>
 where
     S: Stream<Item = Result<Bytes, PayloadError>> + Unpin,
@@ -347,7 +350,7 @@ 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::<_, ()>(
                     Response::ok().set_body(SizedStream::new(STR.len() as u64, body)),
                 )
diff --git a/actix-http/tests/test_server.rs b/actix-http/tests/test_server.rs
index 1c3d3aef6..804cdfc38 100644
--- a/actix-http/tests/test_server.rs
+++ b/actix-http/tests/test_server.rs
@@ -1,6 +1,9 @@
-use std::io::{Read, Write};
-use std::time::Duration;
-use std::{net, thread};
+use std::{
+    convert::Infallible,
+    io::{Read, Write},
+    net, thread,
+    time::Duration,
+};
 
 use actix_http::{
     body::{AnyBody, Body, SizedStream},
@@ -557,7 +560,7 @@ 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::<_, ()>(
                     Response::ok().set_body(SizedStream::new(STR.len() as u64, body)),
                 )
diff --git a/awc/src/frozen.rs b/awc/src/frozen.rs
index 5fe8edb19..cb8c0f1bf 100644
--- a/awc/src/frozen.rs
+++ b/awc/src/frozen.rs
@@ -1,21 +1,21 @@
-use std::convert::TryFrom;
-use std::net;
-use std::rc::Rc;
-use std::time::Duration;
+use std::{convert::TryFrom, error::Error as StdError, net, rc::Rc, time::Duration};
 
 use bytes::Bytes;
 use futures_core::Stream;
 use serde::Serialize;
 
-use actix_http::body::Body;
-use actix_http::http::header::IntoHeaderValue;
-use actix_http::http::{Error as HttpError, HeaderMap, HeaderName, Method, Uri};
-use actix_http::{Error, RequestHead};
+use actix_http::{
+    body::Body,
+    http::{header::IntoHeaderValue, Error as HttpError, HeaderMap, HeaderName, Method, Uri},
+    RequestHead,
+};
 
-use crate::sender::{RequestSender, SendClientRequest};
-use crate::ClientConfig;
+use crate::{
+    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();
diff --git a/awc/src/request.rs b/awc/src/request.rs
index 483524102..c95cee839 100644
--- a/awc/src/request.rs
+++ b/awc/src/request.rs
@@ -1,25 +1,26 @@
-use std::convert::TryFrom;
-use std::rc::Rc;
-use std::time::Duration;
-use std::{fmt, net};
+use std::{convert::TryFrom, error::Error as StdError, fmt, net, rc::Rc, time::Duration};
 
 use bytes::Bytes;
 use futures_core::Stream;
 use serde::Serialize;
 
-use actix_http::body::Body;
-use actix_http::http::header::{self, IntoHeaderPair};
-use actix_http::http::{
-    uri, ConnectionType, Error as HttpError, HeaderMap, HeaderValue, Method, Uri, Version,
+use actix_http::{
+    body::Body,
+    http::{
+        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::frozen::FrozenClientRequest;
-use crate::sender::{PrepForSendingError, RequestSender, SendClientRequest};
-use crate::ClientConfig;
+use crate::{
+    error::{FreezeRequestError, InvalidUrl},
+    frozen::FrozenClientRequest,
+    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,
diff --git a/awc/src/sender.rs b/awc/src/sender.rs
index 0e63be221..812be69fe 100644
--- a/awc/src/sender.rs
+++ b/awc/src/sender.rs
@@ -1,4 +1,5 @@
 use std::{
+    error::Error as StdError,
     future::Future,
     io, net,
     pin::Pin,
@@ -266,7 +267,7 @@ 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,
diff --git a/src/response/builder.rs b/src/response/builder.rs
index b9a10c56b..b0a3045b8 100644
--- a/src/response/builder.rs
+++ b/src/response/builder.rs
@@ -1,6 +1,7 @@
 use std::{
     cell::{Ref, RefMut},
     convert::TryInto,
+    error::Error as StdError,
     future::Future,
     pin::Pin,
     task::{Context, Poll},
@@ -354,7 +355,7 @@ 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)))
     }