// the call, but they may be accessed by other threads for duplex requests.

  /** True if this call still has a request body open. */
  private var requestBodyOpen = false

  /** True if this call still has a response body open. */
  private var responseBodyOpen = false

  /** True if there are more exchanges expected for this call. */
  private var expectMoreExchanges = true

## Version 4.0.1

_2019-07-10_

 *  Fix: Tolerate null-hostile lists in public API. Lists created with `List.of(...)` don't like it
    when you call `contains(null)` on them!
 *  Fix: Retain binary-compatibility in `okhttp3.internal.HttpHeaders.hasBody()`. Some unscrupulous
    coders call this and we don't want their users to suffer.


## Version 4.0.0

_2019-06-26_

        noNewExchangesEvent = !noNewExchanges
        noNewExchanges = true

        // If this route hasn't completed a call, avoid it for new connections.
        if (successCount == 0) {
          if (e != null) {
            connectFailed(call.client, route, e)
          }
          routeFailureCount++
        }
      }

      Unit
    }

    if (noNewExchangesEvent) {

    }
    this.enqueue(
      object : Callback {
        override fun onFailure(
          call: Call,
          e: IOException,
        ) {
          continuation.resumeWithException(e)
        }

        override fun onResponse(
          call: Call,
          response: Response,
        ) {
          continuation.resume(response) {
            response.closeQuietly()
          }
        }
      },
    )

      address = address,
      proxy = proxy,
      socketAddress = socketAddress,
    )
  }

  fun newChain(call: RealCall): RealInterceptorChain {
    return RealInterceptorChain(
      call = call,
      interceptors = listOf(),
      index = 0,
      exchange = null,
      request = call.request(),
      connectTimeoutMillis = 10_000,
      readTimeoutMillis = 10_000,
      writeTimeoutMillis = 10_000,
    )

    )
  }

  override fun connectTcp(): ConnectResult {
    check(rawSocket == null) { "TCP already connected" }

    var success = false

    // Tell the call about the connecting call so async cancels work.
    user.addPlanToCancel(this)
    try {
      user.connectStart(route)

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

    val client =
      OkHttpClient.Builder()
        .connectionPool(poolApi)
        .build()
    val call = client.newCall(Request(addressA.url)) as RealCall
    call.enterNetworkInterceptorExchange(call.request(), true, factory.newChain(call))
    c1.withLock { call.acquireConnectionNoEvents(c1) }

    // Running at time 50, the pool returns that nothing can be evicted until time 150.

  private var nextQueueName = 10000
  private var coordinatorWaiting = false
  private var coordinatorWakeUpAt = 0L

  /**
   * When we need a new thread to run tasks, we call [Backend.execute]. A few microseconds later we
   * expect a newly-started thread to call [Runnable.run]. We shouldn't request new threads until
   * the already-requested ones are in service, otherwise we might create more threads than we need.
   *

    /** Do this task's work, and then start another, such as by calling [startNextTask]. */
    fun start()
  }

  private object TestThreadSerialTask : SerialTask {
    override fun start() = error("unexpected call")
  }

  inner class RunnableSerialTask(
    private val runnable: Runnable,
  ) : SerialTask {
    override fun start() {
      taskRunner.assertThreadHoldsLock()
      require(currentTask == this)

        type = TYPE_RST_STREAM,
        flags = FLAG_NONE,
      )
      sink.writeInt(errorCode.httpCode)
      sink.flush()
    }
  }

  /** The maximum size of bytes that may be sent in a single call to [data]. */
  fun maxDataLength(): Int = maxFrameSize

  /**
   * `source.length` may be longer than the max length of the variant's data frame. Implementations
   * must send multiple frames as necessary.
   *