// TODO: Not implemented
func (m *muxClient) RequestStateless(h HandlerID, req []byte, out chan<- Response) {
	if m.init {
		out <- Response{Err: errors.New("mux client already used")}
	}
	m.init = true

	// Try to grab an initial block.
	m.singleResp = false
	msg := message{
		Op:         OpConnectMux,
		Handler:    h,
		Flags:      FlagEOF,
		Payload:    req,
		DeadlineMS: uint32(m.deadline.Milliseconds()),
	}