Add IntoResponseParts (#797)

* Add `IntoResponseParts`

* docs

* Add test

* don't allow overriding body or response

* macroify impls

* re-order things a bit

* Fix tests

* Also allow overriding version

* Move things into separate modules

* docs

* clean up

* fix trybuild test

* remove churn

* simplify buliding response

* fixup test

* fix docs typo

* Use `HeaderValue::from_static`, might be faster

* Bring back `impl IntoResponse` in example

* Remove blanket impl to improve error message

* don't need to set `content-type`

* Apply suggestions from code review

Co-authored-by: Jonas Platte <[email protected]>

* changelog

Co-authored-by: Jonas Platte <[email protected]>

axum/src/extract/path/mod.rs

@@ -4,12 +4,11 @@
 mod de;
 
 use crate::{
-    body::{boxed, Full},
     extract::{rejection::*, FromRequest, RequestParts},
-    response::{IntoResponse, Response},
     routing::{InvalidUtf8InPathParam, UrlParams},
 };
 use async_trait::async_trait;
+use axum_core::response::{IntoResponse, Response};
 use http::StatusCode;
 use serde::de::DeserializeOwned;
 use std::{
@@ -382,9 +381,7 @@ impl IntoResponse for FailedToDeserializePathParams {
                 (StatusCode::INTERNAL_SERVER_ERROR, self.0.kind.to_string())
             }
         };
-        let mut res = Response::new(boxed(Full::from(body)));
-        *res.status_mut() = status;
-        res
+        (status, body).into_response()
     }
 }