* I/O takes place.
   */
  @Test
  fun canceledBeforeIOSignalsOnFailure() {
    // Force requests to be executed serially.
    val dispatcher = Dispatcher(client.dispatcher.executorService)
    dispatcher.maxRequests = 1
    client =
      client
        .newBuilder()
        .dispatcher(dispatcher)
        .build()
    val requestA = Request(server.url("/a"))