*/
  internal inner class StreamTimeout : AsyncTimeout() {
    override fun timedOut() {
      closeLater(ErrorCode.CANCEL)
      connection.sendDegradedPingLater()
    }

    override fun newTimeoutException(cause: IOException?): IOException =
      SocketTimeoutException("timeout").apply {
        if (cause != null) {
          initCause(cause)
        }

   * handshakes will be required.
   *
   * The deadline is currently hardcoded. We may make this configurable in the future!
   */
  internal fun sendDegradedPingLater() {
    withLock {
      if (degradedPongsReceived < degradedPingsSent) return // Already awaiting a degraded pong.
      degradedPingsSent++
      degradedPongDeadlineNs = System.nanoTime() + DEGRADED_PONG_TIMEOUT_NS