code: func (c *Client) Send(req *gomemcached.MCRequest) (rv *gomemcached.MCResponse, err error) {
  	_, err = transmitRequest(c.conn, req)
  	if err != nil {
  		c.healthy = false
  		return
  	}
  	resp, _, err := getResponse(c.conn, c.hdrBuf)
  	c.healthy = !gomemcached.IsFatal(err)
  	return resp, err
  }
docs: // Send a custom request and get the response.