* Multiple calls to this method may be made concurrently.
     */
    @Throws(IOException::class)
    abstract fun onStream(stream: Http2Stream)

    /**
     * Notification that the connection's peer's settings may have changed to [settings].
     * Implementations should take appropriate action to handle the updated settings.
     *

    if (deferredPlans.isNotEmpty()) return deferredPlans.removeFirst()

    // Do blocking calls to plan a route for a new connection.
    val connect = planConnect()

    // Now that we have a set of IP addresses, make another attempt at getting a connection from
    // the pool. We have a better chance of matching thanks to connection coalescing.
    val pooled2 = planReusePooledConnection(connect, connect.routes)

    // proxy and would manifest as a standard IOException. Unless it is one we know we should not
    // retry, we return true and try a new route.
    return true
  }

  /**
   * Figures out the HTTP request to make in response to receiving [userResponse]. This will
   * either add authentication headers, follow redirects or handle a client request timeout. If a
   * follow-up is either unnecessary or not applicable, this returns null.
   */

   * Okio buffers are internally implemented as a linked list of arrays. Usually this implementation
   * detail is invisible to the caller, but subtle use of certain APIs may depend on these internal
   * structures.
   *
   * We make such subtle calls in [okhttp3.internal.ws.MessageInflater] because we try to read a
   * compressed stream that is terminated in a web socket frame even though the DEFLATE stream is
   * not terminated.
   *

  @Throws(InterruptedException::class)
  fun takeRequest(
    timeout: Long,
    unit: TimeUnit,
  ): RecordedRequest? = requestQueue.poll(timeout, unit)

  /**
   * Scripts [response] to be returned to a request made in sequence. The first request is
   * served by the first enqueued response; the second request by the second enqueued response; and
   * so on.
   *
   * @throws ClassCastException if the default dispatcher has been

 *
 * Mappings may overlap.
 *
 * ASCII-Only
 * ==========
 *
 * Neither the section index nor the ranges data use bit 0x80 anywhere. That means the data is
 * strictly ASCII. This is intended to make it efficient to encode this data as a string, and to
 * index into it as a string.
 *
 * The mappings data contains non-ASCII characters.
 */
internal class IdnaMappingTable internal constructor(

        }

        servedDate != null -> {
          conditionName = "If-Modified-Since"
          conditionValue = servedDateString
        }

        else -> return CacheStrategy(request, null) // No condition! Make a regular request.
      }

      val conditionalRequestHeaders = request.headers.newBuilder()
      conditionalRequestHeaders.addLenient(conditionName, conditionValue!!)

      val conditionalRequest =

    try {
      val connection = exchangeFinderFactory(this, state.address, PoolConnectionUser).find()

      // RealRoutePlanner will add the connection to the pool itself, other RoutePlanners may not
      // TODO: make all RoutePlanners consistent in this behavior
      if (connection !in connections) {
        connection.withLock { put(connection) }
      }

      return 0L // run again immediately to create more connections if needed

        .status("HTTP/1.1 200 Fantastic")
    transferKind.setBody(mockResponse, "I love puppies but hate spiders", 1)
    server.enqueue(mockResponse.build())

    // Make sure that calling skip() doesn't omit bytes from the cache.
    val request = Request.Builder().url(server.url("/")).build()
    val response1 = client.newCall(request).execute()
    val in1 = response1.body.source()

    peer.play()

    // Play it back.
    val connection = connect(peer)
    connection.writePingAndAwaitPong() // Make sure settings have been acked.
    val stream = connection.newStream(headerEntries("b", "banana"), true)
    connection.writePingAndAwaitPong() // Make sure the window update has been received.
    val sink = stream.getSink()
    stream.writeTimeout().timeout(500, TimeUnit.MILLISECONDS)