.build(),
    )
    var call =
      client.newCallWithListener(
        Request
          .Builder()
          .url(server.url("/"))
          .build(),
      )
    var response = call.execute()
    assertThat(response.code).isEqualTo(200)
    response.close()
    eventRecorder.clearAllEvents()
    call = call.cloneWithListener()
    response = call.execute()

 */
internal abstract class ConnectionListener {
  /**
   * Invoked as soon as a call causes a connection to be started.
   */
  open fun connectStart(
    route: Route,
    call: Call,
  ) {}

  /**
   * Invoked when a connection fails to be established.
   */
  open fun connectFailed(
    route: Route,
    call: Call,
    failure: IOException,
  ) {}

  /**

                </div>
                <div class="col-md-6">
                    <div class="card card-outline card-primary">
                        <la:form action="/admin/design/">
                            <div class="card-header">
                                <h3 class="card-title">
                                    <la:message key="labels.design_title_file"/>
                                </h3>

 *
 * Other exception types cancel the current call:
 *
 *  * For synchronous calls made with [Call.execute], the exception is propagated to the caller.
 *
 *  * For asynchronous calls made with [Call.enqueue], an [IOException] is propagated to the caller
 *    indicating that the call was canceled. The interceptor's exception is delivered to the current

    check(rawSocket == null) { "TCP already connected" }

    var success = false

    // Tell the call about the connecting call so async cancels work.
    call.plansToCancel += this
    try {
      call.eventListener.connectStart(call, route.socketAddress, route.proxy)
      connectionPool.connectionListener.connectStart(route, call)

      connectSocket()
      success = true
      return ConnectResult(plan = this)

d-color:#6c757d}.card-secondary:not(.card-outline)>.card-header,.card-secondary:not(.card-outline)>.card-header a{color:#fff}.card-secondary:not(.card-outline)>.card-header a.active{color:#1f2d3d}.card-secondary.card-outline{border-top:3px solid #6c757d}.card-secondary.card-outline-tabs>.card-header a:hover{border-top:3px solid #dee2e6}.card-secondary.card-outline-tabs>.card-header a.active,.card-secondary.card-outline-tabs>.card-header a.active:hover{border-top:3px solid #6c757d}.bg-gradient-se...

        .trailersDelay(1, TimeUnit.SECONDS)
        .build(),
    )

    val call = client.newCall(Request(server.url("/")))
    call.execute().use { response ->
      val source = response.body.source()
      assertThat(response.header("h1")).isEqualTo("v1")
      assertThat(source.readUtf8(5)).isEqualTo("Hello")
      call.cancelLater(500.milliseconds)
      val trailersDelay =
        measureTime {

        .build()

    val startNanos = System.nanoTime()
    val call = client.newCall(request)

    // Schedule a job to cancel the call in 1 second.
    executor.schedule({
      System.out.printf("%.2f Canceling call.%n", (System.nanoTime() - startNanos) / 1e9f)
      call.cancel()
      System.out.printf("%.2f Canceled call.%n", (System.nanoTime() - startNanos) / 1e9f)
    }, 1, TimeUnit.SECONDS)

        localhostIpv4,
        localhostIpv6,
      )
    serverIpv4.enqueue(
      MockResponse(body = "unexpected call to IPv4"),
    )
    serverIpv6.enqueue(
      MockResponse(body = "hello from IPv6"),
    )

    val call = client.newCall(Request(url))
    val response = call.execute()
    assertThat(response.body.string()).isEqualTo("hello from IPv6")

        override fun requestHeadersEnd(
          call: Call,
          request: Request,
        ) = TODO()

        override fun requestBodyStart(call: Call) = TODO()

        override fun requestBodyEnd(
          call: Call,
          byteCount: Long,
        ) = TODO()

        override fun requestFailed(
          call: Call,
          ioe: IOException,