Add rejection tracing to all extractors (#2584)

axum-extra/src/extract/form.rs

@@ -81,11 +81,16 @@ impl IntoResponse for FormRejection {
     fn into_response(self) -> Response {
         match self {
             Self::RawFormRejection(inner) => inner.into_response(),
-            Self::FailedToDeserializeForm(inner) => (
-                StatusCode::BAD_REQUEST,
-                format!("Failed to deserialize form: {inner}"),
-            )
-                .into_response(),
+            Self::FailedToDeserializeForm(inner) => {
+                let body = format!("Failed to deserialize form: {inner}");
+                let status = StatusCode::BAD_REQUEST;
+                axum_core::__log_rejection!(
+                    rejection_type = Self,
+                    body_text = body,
+                    status = status,
+                );
+                (status, body).into_response()
+            }
         }
     }
 }

axum-extra/src/extract/multipart.rs

@@ -379,7 +379,13 @@ pub struct InvalidBoundary;
 
 impl IntoResponse for InvalidBoundary {
     fn into_response(self) -> Response {
-        (self.status(), self.body_text()).into_response()
+        let body = self.body_text();
+        axum_core::__log_rejection!(
+            rejection_type = Self,
+            body_text = body,
+            status = self.status(),
+        );
+        (self.status(), body).into_response()
     }
 }
 

axum-extra/src/extract/query.rs

@@ -114,11 +114,16 @@ pub enum QueryRejection {
 impl IntoResponse for QueryRejection {
     fn into_response(self) -> Response {
         match self {
-            Self::FailedToDeserializeQueryString(inner) => (
-                StatusCode::BAD_REQUEST,
-                format!("Failed to deserialize query string: {inner}"),
-            )
-                .into_response(),
+            Self::FailedToDeserializeQueryString(inner) => {
+                let body = format!("Failed to deserialize query string: {inner}");
+                let status = StatusCode::BAD_REQUEST;
+                axum_core::__log_rejection!(
+                    rejection_type = Self,
+                    body_text = body,
+                    status = status,
+                );
+                (status, body).into_response()
+            }
         }
     }
 }

axum-extra/src/lib.rs

@@ -21,6 +21,7 @@
 //! `multipart` | Enables the `Multipart` extractor | No
 //! `protobuf` | Enables the `Protobuf` extractor and response | No
 //! `query` | Enables the `Query` extractor | No
+//! `tracing` | Log rejections from built-in extractors | Yes
 //! `typed-routing` | Enables the `TypedPath` routing utilities | No
 //! `typed-header` | Enables the `TypedHeader` extractor and response  | No
 //!