* served by the first enqueued response; the second request by the second enqueued response; and
   * so on.
   *
   * @throws ClassCastException if the default dispatcher has been
   * replaced with [setDispatcher][dispatcher].
   */
  fun enqueue(response: MockResponse) = (dispatcher as QueueDispatcher).enqueueResponse(response)

  /**
   * Starts the server on the loopback interface for the given port.
   *