// then we're on the hook to close it.
    val healthy = candidate.isHealthy(connectionUser.doExtensiveHealthChecks())
    var noNewExchangesEvent = false
    val toClose: Socket? =
      candidate.withLock {
        when {
          !healthy -> {
            noNewExchangesEvent = !candidate.noNewExchanges
            candidate.noNewExchanges = true

            ThreadPoolExecutor(
              0,
              Int.MAX_VALUE,
              60,
              TimeUnit.SECONDS,
              SynchronousQueue(),
              threadFactory("$okHttpName Dispatcher", false),
            )
        }
        return executorServiceOrNull!!
      }

  /** Ready async calls in the order they'll be run. */
  private val readyAsyncCalls = ArrayDeque<AsyncCall>()

    }
  }

  /** Prepares the [request] to be executed at some point in the future. */
  override fun newCall(request: Request): Call = RealCall(this, request, forWebSocket = false)

  /** Uses [request] to connect a new web socket. */
  override fun newWebSocket(
    request: Request,
    listener: WebSocketListener,
  ): WebSocket {
    val webSocket =
      RealWebSocket(

## Version 5.0.0-alpha.11

_2022-12-24_

 *  New: Enable fast fallback by default. It's our implementation of Happy Eyeballs,
    [RFC 8305][rfc_8305]. Disable with `OkHttpClient.Builder.fastFallback(false)`.
 *  Fix: Don't log response bodies for server-sent events.
 *  Fix: Skip early hints (status code 103) responses.
 *  Fix: Don't log sensitive headers in `Request.toString()`.

    assertCached(false, 303)
    assertCached(false, 304)
    assertCached(false, 305)
    assertCached(false, 306)
    assertCached(true, 307)
    assertCached(true, 308)
    assertCached(false, 400)
    assertCached(false, 401)
    assertCached(false, 402)
    assertCached(false, 403)
    assertCached(true, 404)
    assertCached(true, 405)
    assertCached(false, 406)
    assertCached(false, 408)

        socket.close()
        return false
      }
      if (response.socketPolicy === HalfCloseAfterRequest) {
        socket.shutdownOutput()
        return false
      }
      if (response.socketPolicy === NoResponse) {
        // This read should block until the socket is closed. (Because nobody is writing.)
        if (source.exhausted()) return false
        throw ProtocolException("unexpected data")
      }

   * @param callerIsIdle true if the caller isn't sending any more bytes until the peer responds.
   *     This is true after a `Expect-Continue` request, false for duplex requests, and false for
   *     all other requests.
   */
  @Throws(IOException::class)
  fun takeHeaders(callerIsIdle: Boolean = false): Headers {
    this.withLock {
      while (headersQueue.isEmpty() && errorCode == null) {

  override fun connectionConnectionClosed(connection: RealConnection) {
  }

  override fun noNewExchanges(connection: RealConnection) {
  }

  override fun doExtensiveHealthChecks(): Boolean = false

  override fun isCanceled(): Boolean = false

  override fun candidateConnection(): RealConnection? = null

  override fun proxySelectStart(url: HttpUrl) {
  }

  override fun proxySelectEnd(
    url: HttpUrl,

                override fun close() {
                  responseClosed = true
                }
              }.buffer()
          },
        )
        .build()

    var responseClosed = false
    var canceled = false
    var afterCallbackOnResponse: () -> Unit = {}

    override fun cancel() {
      canceled = true
    }

    override fun enqueue(responseCallback: Callback) {

      box.write(buffer, 1)
      result.write(box.copy(), 1)
    }
    return result
  }

  tailrec fun File.isDescendentOf(directory: File): Boolean {
    val parentFile = parentFile ?: return false
    if (parentFile == directory) return true
    return parentFile.isDescendentOf(directory)
  }

  /**
   * See FinalizationTester for discussion on how to best trigger GC in tests.