// Release the threads.
    writerQueue.shutdown()
    pushQueue.shutdown()
    settingsListenerQueue.shutdown()
  }

  private fun failConnection(e: IOException?) {
    close(ErrorCode.PROTOCOL_ERROR, ErrorCode.PROTOCOL_ERROR, e)
  }

  /**
   * Sends any initial frames and starts reading frames from the remote peer. This should be called
   * after [Builder.build] for all new connections.
   *

    peer.sendFrame().settings(Settings())
    peer.acceptFrame() // ACK
    peer.acceptFrame() // SYN_STREAM 3
    peer.acceptFrame() // SYN_STREAM 5
    peer.sendFrame().goAway(3, ErrorCode.PROTOCOL_ERROR, EMPTY_BYTE_ARRAY)
    peer.acceptFrame() // PING
    peer.sendFrame().ping(true, Http2Connection.AWAIT_PING, 0)
    peer.acceptFrame() // DATA STREAM 3
    peer.play()

    // Play it back.