@Throws(IOException::class)
  override fun onStream(stream: Http2Stream) {
    stream.close(ErrorCode.REFUSED_STREAM, null)
  }

  /** When settings are received, adjust the allocation limit. */
  override fun onSettings(
    connection: Http2Connection,
    settings: Settings,
  ) {
    withLock {
      allocationLimit = settings.getMaxConcurrentStreams()
    }
  }