Use one http response recorder per external http call (#16938)

cmd/bucket-replication.go

@@ -1004,7 +1004,7 @@ func replicateObject(ctx context.Context, ri ReplicateObjectInfo, objectAPI Obje
 			},
 		}
 
-		_, _ = objectAPI.PutObjectMetadata(ctx, bucket, object, popts);
+		_, _ = objectAPI.PutObjectMetadata(ctx, bucket, object, popts)
 		opType := replication.MetadataReplicationType
 		if rinfos.Action() == replicateAll {
 			opType = replication.ObjectReplicationType

cmd/generic-handlers.go

@@ -555,7 +555,7 @@ func addCustomHeaders(h http.Handler) http.Handler {
 		if globalLocalNodeName != "" {
 			w.Header().Set(xhttp.AmzRequestHostID, globalLocalNodeNameHex)
 		}
-		h.ServeHTTP(xhttp.NewResponseRecorder(w), r)
+		h.ServeHTTP(w, r)
 	})
 }
 

cmd/handler-utils.go

@@ -355,11 +355,11 @@ func collectAPIStats(api string, f http.HandlerFunc) http.HandlerFunc {
 		globalHTTPStats.currentS3Requests.Inc(api)
 		defer globalHTTPStats.currentS3Requests.Dec(api)
 
-		statsWriter := xhttp.NewResponseRecorder(w)
+		f.ServeHTTP(w, r)
 
-		f.ServeHTTP(statsWriter, r)
-
-		globalHTTPStats.updateStats(api, r, statsWriter)
+		if sw, ok := w.(*xhttp.ResponseRecorder); ok {
+			globalHTTPStats.updateStats(api, r, sw)
+		}
 	}
 }
 

cmd/http-tracer.go

@@ -67,8 +67,12 @@ func getOpName(name string) (op string) {
 // otherwise, generate a trace event with request information but no response.
 func httpTracer(h http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Setup a http request response recorder - this is needed for
+		// http stats requests and audit if enabled.
+		respRecorder := xhttp.NewResponseRecorder(w)
+
 		if globalTrace.NumSubscribers(madmin.TraceS3|madmin.TraceInternal) == 0 {
-			h.ServeHTTP(w, r)
+			h.ServeHTTP(respRecorder, r)
 			return
 		}
 
@@ -80,9 +84,8 @@ func httpTracer(h http.Handler) http.Handler {
 		ctx := context.WithValue(r.Context(), mcontext.ContextTraceKey, &tc)
 		r = r.WithContext(ctx)
 
-		// Setup a http request and response body recorder
+		// Setup a http request body recorder
 		reqRecorder := &xhttp.RequestRecorder{Reader: r.Body}
-		respRecorder := xhttp.NewResponseRecorder(w)
 
 		tc.RequestRecorder = reqRecorder
 		tc.ResponseRecorder = respRecorder