minor

context/context.go

@@ -2717,6 +2717,11 @@ func (ctx *Context) CompressWriter(enable bool) error {
 		w.Disabled = true
 	case *ResponseRecorder:
 		if enable {
+			// If it's a recorder which already wraps the compress, exit.
+			if _, ok := w.ResponseWriter.(*CompressResponseWriter); ok {
+				return nil
+			}
+
 			// Keep the Recorder as ctx.writer.
 			// Wrap the existing net/http response writer
 			// with the compressed writer and

middleware/accesslog/accesslog.go

@@ -114,7 +114,14 @@ func (ac *AccessLog) SetOutput(writers ...io.Writer) *AccessLog {
 		}
 	}
 
-	ac.Writer = io.MultiWriter(writers...)
+	switch len(writers) {
+	case 0:
+	case 1:
+		ac.Writer = writers[0]
+	default:
+		ac.Writer = io.MultiWriter(writers...)
+	}
+
 	return ac
 }