/**
   * If true, no new exchanges can be created on this connection. It is necessary to set this to
   * true when removing a connection from the pool; otherwise a racing caller might get it from the
   * pool when it shouldn't. Symmetrically, this must always be checked before returning a
   * connection from the pool.
   *
   * Once true this is always true. Guarded by this.
   */
  var noNewExchanges = false

  /** 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

    ```kotlin
    val response: Response = call.execute()
    val multipartReader = MultipartReader(response.body!!)

    multipartReader.use {
      while (true) {
        val part = multipartReader.nextPart() ?: break
        process(part.headers, part.body)
      }
    }
    ```

 *  New: `MediaType.parameter()` gets a parameter like `boundary` from a media type like

    // Make an SSL Tunnel on the first message pair of each SSL + proxy connection.
    val url = route.address.url
    val requestLine = "CONNECT ${url.toHostHeader(includeDefaultPort = true)} HTTP/1.1"
    while (true) {
      val source = this.source!!
      val sink = this.sink!!
      val tunnelCodec =
        Http1ExchangeCodec(
          // No client for CONNECT tunnels:
          client = null,

    object : Runnable {
      override fun run() {
        var incrementedRunCallCount = false
        while (true) {
          val task =
            ******@****.***ck {
              if (!incrementedRunCallCount) {
                incrementedRunCallCount = true
                runCallCount++
              }
              awaitTaskToRun()
            } ?: return

    taskRunner.lock.withLock {
      yieldUntil()
    }
  }

  /** Process the queue until [condition] returns true. */
  private tailrec fun yieldUntil(
    strategy: ResumePriority = ResumePriority.AfterEnqueuedTasks,
    condition: () -> Boolean = { true },
  ) {
    taskRunner.assertThreadHoldsLock()
    val self = currentTask

    val yieldCompleteTask =
      object : SerialTask {

    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.
    assertThat(pool.closeConnections(50L)).isEqualTo(100L)

    var followUpCount = 0
    var priorResponse: Response? = null
    var newRoutePlanner = true
    var recoveredFailures = listOf<IOException>()
    while (true) {
      call.enterNetworkInterceptorExchange(request, newRoutePlanner, chain)

      var response: Response
      var closeActiveExchange = true
      try {
        if (call.isCanceled()) {
          throw IOException("Canceled")
        }

      return true
    }

    if (nextRouteToTry != null) {
      return true
    }

    if (failedConnection != null) {
      val retryRoute = retryRoute(failedConnection)
      if (retryRoute != null) {
        // Lock in the route because retryRoute() is racy and we don't want to call it twice.
        nextRouteToTry = retryRoute
        return true
      }
    }

   *
   * @param sendConnectionPreface true to send connection preface frames. This should always be true
   *     except for in tests that don't check for a connection preface.
   * @param taskRunner the TaskRunner to use, daemon by default.
   */
  @Throws(IOException::class)
  @JvmOverloads
  fun start(sendConnectionPreface: Boolean = true) {
    if (sendConnectionPreface) {
      writer.connectionPreface()