code: func (resp *Response) Body() []byte {
  	if resp.bodyStream != nil {
  		bodyBuf := resp.bodyBuffer()
  		bodyBuf.Reset()
  		_, err := copyZeroAlloc(bodyBuf, resp.bodyStream)
  		resp.closeBodyStream()
  		if err != nil {
  			bodyBuf.SetString(err.Error())
  		}
  	}
  	return resp.bodyBytes()
  }
docs: // Body returns response body.
  //
  // The returned body is valid until the response modification.