From 20301bc2125b9aebb22a849cc76b4bb3ecb3f404 Mon Sep 17 00:00:00 2001
From: JessonChan <chinachendongpo@gmail.com>
Date: Wed, 24 Feb 2016 10:31:44 +0800
Subject: [PATCH] multiple response.WriteHeader calls

---
 context/context.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/context/context.go b/context/context.go
index db790ff2..837a1b45 100644
--- a/context/context.go
+++ b/context/context.go
@@ -187,6 +187,10 @@ func (w *Response) Write(p []byte) (int, error) {
 // WriteHeader sends an HTTP response header with status code,
 // and sets `started` to true.
 func (w *Response) WriteHeader(code int) {
+	if w.Status > 0 {
+		//prevent multiple response.WriteHeader calls
+		return
+	}
 	w.Status = code
 	w.Started = true
 	w.ResponseWriter.WriteHeader(code)