code: func (resp *Response) WriteGzip(w *bufio.Writer) error {
  	return resp.WriteGzipLevel(w, CompressDefaultCompression)
  }
docs: // WriteGzip writes response with gzipped body to w.
  //
  // The method gzips response body and sets 'Content-Encoding: gzip'
  // header before writing response to w.
  //
  // WriteGzip doesn't flush response to w for performance reasons.