// DumpRequestOut, fall back to the old way if the caller
	// provides a non-server Request.
	reqURI := req.RequestURI
	if reqURI == "" {
		reqURI = req.URL.RequestURI()
	}

	fmt.Fprintf(&b, "%s %s HTTP/%d.%d\r\n", valueOrDefault(req.Method, "GET"),
		reqURI, req.ProtoMajor, req.ProtoMinor)

	req.Header.Set("content-md5", "====test")
	jsonReq := dumpRequest(req)
	type jsonResult struct {
		Method     string      `json:"method"`
		RequestURI string      `json:"reqURI"`
		Header     http.Header `json:"header"`
	}
	res := jsonResult{}
	if err = json.Unmarshal([]byte(strings.ReplaceAll(jsonReq, "%%", "%")), &res); err != nil {
		t.Fatal(err)
	}

	// to ignore URL encoded values.
	rawURI := strings.ReplaceAll(r.RequestURI, "%", "%%")
	req := struct {
		Method     string      `json:"method"`
		RequestURI string      `json:"reqURI"`
		Header     http.Header `json:"header"`
	}{r.Method, rawURI, header}

	var buffer bytes.Buffer
	enc := json.NewEncoder(&buffer)
	enc.SetEscapeHTML(false)
	if err := enc.Encode(&req); err != nil {