code: func (req *MCRequest) Transmit(w io.Writer) (n int, err error) {
  	if len(req.Body) < 128 {
  		n, err = w.Write(req.Bytes())
  	} else {
  		n, err = w.Write(req.HeaderBytes())
  		if err == nil {
  			m := 0
  			m, err = w.Write(req.Body)
  			n += m
  		}
  	}
  	return
  }
docs: // Send this request message across a writer.