gistfile1.txt

func copyHeader(dst, src http.Header) {
	for k, vv := range src {
		for _, v := range vv {
			dst.Add(k, v)
		}
	}
}

func cloneReq(req *http.Request) *http.Request {
	outreq := new(http.Request)
	*outreq = *req
	outreq.URL = new(url.URL)
	*outreq.URL = *req.URL
	outreq.Header = make(http.Header)
	copyHeader(outreq.Header, req.Header)
	if req.Body != nil {
		b, err := ioutil.ReadAll(req.Body)
		if err != nil {
			glog.Errorf("body read failed: %s", err)
		}
		outreq.Body = ioutil.NopCloser(bytes.NewReader(b))
	}
	return outreq
}