Fix HTTPResponseRecorder playing back a zero status code

http.go

@@ -45,11 +45,15 @@ func (this *HTTPResponseRecorder) WriteHeader (statusCode int) {
 // recorder.
 func (this *HTTPResponseRecorder) Play (res http.ResponseWriter) error {
 	defer this.Reset()
+	status := this.Status
+	if status == 0 {
+		status = http.StatusOK
+	}
 	header := res.Header()
 	for name, value := range this.Head {
 		header[name] = value
 	}
-	res.WriteHeader(this.Status)
+	res.WriteHeader(status)
 	_, err := io.Copy(res, &this.buffer)
 	return err
 }