private val attempt: Int,
  private val tunnelRequest: Request?,
  internal val connectionSpecIndex: Int,
  internal val isTlsFallback: Boolean,
) : RoutePlanner.Plan,
  ExchangeCodec.Carrier {
  /** True if this connect was canceled; typically because it lost a race. */
  @Volatile private var canceled = false

  // These properties are initialized by connect() and never reassigned.

expect our code of conduct to be honored.

Square’s open source community strives to:

 * **Be open**: We invite anyone to participate in any aspect of our projects. Our community is
   open, and any responsibility can be carried by a contributor who demonstrates the required
   capacity and competence.

 * **Be considerate**: People use our work, and we depend on the work of others. Consider users and

 * Not invoked for cached responses that short-circuit the network.
 * Observe the data just as it will be transmitted over the network.
 * Access to the `Connection` that carries the request.

### Rewriting Requests

    addEdge(1, 2, "foo");
    addEdge(3, 4, "bar");
    addEdge(5, 6, "baz");

    int threadCount = 20;
    ExecutorService executor = newFixedThreadPool(threadCount);
    CyclicBarrier barrier = new CyclicBarrier(threadCount);
    ImmutableList.Builder<Future<?>> futures = ImmutableList.builder();
    for (int i = 0; i < threadCount; i++) {
      futures.add(
          executor.submit(

   * There are a number of ways to solve this, none of which are very pretty, and it is currently
   * believed to be a purely theoretical problem (since the other actions should supply sufficient
   * write-barriers).
   */

  @LazyInit private @Nullable ListenableFuture<V> delegateRef;
  @LazyInit private @Nullable ScheduledFuture<?> timer;

  private TimeoutFuture(ListenableFuture<V> delegate) {

    fun addTrustedCertificate(certificate: X509Certificate) =
      apply {
        this.trustedCertificates += certificate
      }

    /**
     * Add all of the host platform's trusted root certificates. This set varies by platform
     * (Android vs. Java), by platform release (Android 4.4 vs. Android 9), and with user
     * customizations.
     *
     * Most TLS clients that connect to hosts on the public Internet should call this method.

  /** Returns the HTTP status message. */
  @get:JvmName("message") val message: String,
  /** Returns the HTTP status code. */
  @get:JvmName("code") val code: Int,
  /**
   * Returns the TLS handshake of the connection that carried this response, or null if the
   * response was received without TLS.
   */
  @get:JvmName("handshake") val handshake: Handshake?,
  /** Returns the HTTP headers. */
  @get:JvmName("headers") val headers: Headers,
  /**

 *    Note that the private key is not a part of the certificate!
 *
 *  * **A signature issued by another certificate's private key.** This mechanism allows a trusted
 *    third-party to endorse a certificate. Third parties should only endorse certificates once
 *    they've confirmed that the owner of the private key is also the owner of the certificate's
 *    other properties.
 *

  private var taskQueue = taskRunner.newQueue()

  /** Names this web socket for observability and debugging. */
  private var name: String? = null

  /** The socket that carries this web socket. This is canceled when the web socket fails. */
  private var socket: Socket? = null

  /** Outgoing pongs in the order they should be written. */
  private val pongQueue = ArrayDeque<ByteString>()

    return new HashSet<>(Maps.capacity(expectedSize));
  }

  /**
   * Creates a thread-safe set backed by a hash map. The set is backed by a {@link
   * ConcurrentHashMap} instance, and thus carries the same concurrency guarantees.
   *
   * <p>Unlike {@code HashSet}, this class does NOT allow {@code null} to be used as an element. The
   * set is serializable.
   *
   * @return a new, empty thread-safe {@code Set}