Add IntoResponse impl to customize-extractor-error example (#2191)

examples/customize-extractor-error/src/derive_from_request.rs

@@ -15,17 +15,26 @@ use axum::{
     extract::rejection::JsonRejection, extract::FromRequest, http::StatusCode,
     response::IntoResponse,
 };
+use serde::Serialize;
 use serde_json::{json, Value};
 
 pub async fn handler(Json(value): Json<Value>) -> impl IntoResponse {
-    Json(dbg!(value));
+    Json(dbg!(value))
 }
 
 // create an extractor that internally uses `axum::Json` but has a custom rejection
 #[derive(FromRequest)]
 #[from_request(via(axum::Json), rejection(ApiError))]
 pub struct Json<T>(T);
 
+// We implement `IntoResponse` for our extractor so it can be used as a response
+impl<T: Serialize> IntoResponse for Json<T> {
+    fn into_response(self) -> axum::response::Response {
+        let Self(value) = self;
+        axum::Json(value).into_response()
+    }
+}
+
 // We create our own rejection type
 #[derive(Debug)]
 pub struct ApiError {