Move Headers into axum

axum-core/src/response/mod.rs

@@ -19,11 +19,6 @@ use http_body::{
 };
 use std::{borrow::Cow, convert::Infallible, iter};
 
-mod headers;
-
-#[doc(inline)]
-pub use self::headers::Headers;
-
 /// Type alias for [`http::Response`] whose body type defaults to [`BoxBody`], the most common body
 /// type used with axum.
 pub type Response<T = BoxBody> = http::Response<T>;
@@ -356,17 +351,10 @@ impl IntoResponse for StatusCode {
     }
 }
 
-impl<H> IntoResponse for H
-where
-    H: IntoResponseHeaders,
-{
+impl IntoResponse for HeaderMap {
     fn into_response(self) -> Response {
         let mut res = Response::new(boxed(Empty::new()));
-
-        if let Err(e) = try_extend_headers(res.headers_mut(), self.into_headers()) {
-            return e;
-        }
-
+        *res.headers_mut() = self;
         res
     }
 }