call.

    The `RequestBody.writeTo()` method may now retain a reference to the provided sink and
    hand it off to another thread to write to it after `writeTo` returns.

    The `EventListener` may now see requests and responses interleaved in ways not previously
    permitted. For example, a listener may receive `responseHeadersStart()` followed by

              return socket
            }
          },
        ).sslSocketFactory(
          handshakeCertificates.sslSocketFactory(),
          handshakeCertificates.trustManager,
        ).eventListener(listener)
        .apply {
          if (connectionType == HTTPS) {
            protocols(listOf(HTTP_1_1))
          }
        }.build()
    threadToCancel = Thread.currentThread()
  }

        .build()
    var client = buildClient(clientCert, clientIntermediateCa.certificate)
    val listener = RecordingEventListener()
    client =
      client
        .newBuilder()
        .eventListener(listener)
        .build()
    val socketFactory = buildServerSslSocketFactory()
    server.useHttps(socketFactory)
    server.requireClientAuth()

  fun connectionIsImmediatelyUnhealthy() {
    val listener: EventListener =
      object : EventListener() {
        override fun connectionAcquired(
          call: Call,
          connection: Connection,
        ) {
          connection.socket().closeQuietly()
        }
      }
    client =
      client
        .newBuilder()
        .eventListener(listener)
        .build()

      MockResponse(body = "XXX"),
    )
    val connections: MutableList<RealConnection?> = ArrayList()
    val localClient =
      client
        .newBuilder()
        .eventListener(
          object : EventListener() {
            override fun connectionAcquired(
              call: Call,
              connection: Connection,
            ) {
              connections.add(connection as RealConnection)

    parameter to be non-null was an unintended signature change in OkHttp 4.0.

 *  New: `EventListener.retryDecision()` is called each time a request fails with an `IOException`.
    It notifies your listener if OkHttp will retry.

 *  New: `EventListener.followUpDecision()` is called each time a response is received. It notifies

            throw AssertionError()
          }
          super.responseHeadersEnd(call, response)
        }
      }
    client =
      client
        .newBuilder()
        .eventListener(listener)
        .build()
    val body =
      MockSocketHandler()
        .sendResponse("/a has moved!\n", duplexResponseSent)
        .requestIOException()
        .exhaustResponse()
    server.enqueue(