Implement IntoResponse and IntoResponseParts for http::Extensions (#975)

* Implement `IntoResponse` and `IntoResponseParts` for `http::Extensions`

Requires a new release of `http`.

* remove http patch

* changelog ref

axum-core/CHANGELOG.md

@@ -7,7 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 # Unreleased
 
-- None.
+- **added:** Implement `IntoResponse` and `IntoResponseParts` for `http::Extensions` ([#975])
+
+[#975]: https://github.com/tokio-rs/axum/pull/975
 
 # 0.2.3 (25. April, 2022)
 

axum-core/Cargo.toml

@@ -14,7 +14,7 @@ version = "0.2.3" # remember to also bump the version that axum depends on
 async-trait = "0.1"
 bytes = "1.0"
 futures-util = { version = "0.3", default-features = false, features = ["alloc"] }
-http = "0.2"
+http = "0.2.7"
 http-body = "0.4"
 mime = "0.3.16"
 

axum-core/src/response/into_response.rs

@@ -3,7 +3,7 @@ use crate::{body, BoxError};
 use bytes::{buf::Chain, Buf, Bytes, BytesMut};
 use http::{
     header::{self, HeaderMap, HeaderName, HeaderValue},
-    StatusCode,
+    Extensions, StatusCode,
 };
 use http_body::{
     combinators::{MapData, MapErr},
@@ -384,6 +384,14 @@ impl IntoResponse for HeaderMap {
     }
 }
 
+impl IntoResponse for Extensions {
+    fn into_response(self) -> Response {
+        let mut res = ().into_response();
+        *res.extensions_mut() = self;
+        res
+    }
+}
+
 impl<K, V, const N: usize> IntoResponse for [(K, V); N]
 where
     K: TryInto<HeaderName>,

axum-core/src/response/into_response_parts.rs

@@ -249,3 +249,12 @@ macro_rules! impl_into_response_parts {
 }
 
 all_the_tuples!(impl_into_response_parts);
+
+impl IntoResponseParts for Extensions {
+    type Error = Infallible;
+
+    fn into_response_parts(self, mut res: ResponseParts) -> Result<ResponseParts, Self::Error> {
+        res.extensions_mut().extend(self);
+        Ok(res)
+    }
+}