Add an Attachment type to axum-extra (#2789)

axum-extra/src/response/mod.rs

@@ -3,6 +3,9 @@
 #[cfg(feature = "erased-json")]
 mod erased_json;
 
+#[cfg(feature = "attachment")]
+mod attachment;
+
 #[cfg(feature = "erased-json")]
 pub use erased_json::ErasedJson;
 
@@ -10,6 +13,9 @@ pub use erased_json::ErasedJson;
 #[doc(no_inline)]
 pub use crate::json_lines::JsonLines;
 
+#[cfg(feature = "attachment")]
+pub use attachment::Attachment;
+
 macro_rules! mime_response {
     (
         $(#[$m:meta])*