code: func (h *ServeReplay) ServeHTTP(w http.ResponseWriter, r *http.Request) {
  	if h.i >= len(h.Handlers) {
  		h.NoneLeftFunc(h.t, r)
  	} else {
  		h.Handlers[h.i].ServeHTTP(w, r)
  		h.i++
  	}
  }
docs: // ServeHTTP dispatches the request to the next handler in the list.