streamID uint32
	rw       *http2responseWriter
	req      *Request
	handler  func(ResponseWriter, *Request)
}

// scheduleHandler starts a handler goroutine,
// or schedules one to start as soon as an existing handler finishes.
func (sc *http2serverConn) scheduleHandler(streamID uint32, rw *http2responseWriter, req *Request, handler func(ResponseWriter, *Request)) error {
	sc.serveG.check()