@Throws(IOException::class)
  fun applyAndAckSettings(peerSettings: Settings) {
    withLock {
      if (closed) throw IOException("closed")
      this.maxFrameSize = peerSettings.getMaxFrameSize(maxFrameSize)
      if (peerSettings.headerTableSize != -1) {
        hpackWriter.resizeHeaderTable(peerSettings.headerTableSize)
      }
      frameHeader(
        streamId = 0,
        length = 0,

    settings[Settings.MAX_FRAME_SIZE] = newMaxFrameSize
    val connection = connectWithSettings(true, settings)

    // verify the peer's settings were read and applied.
    assertThat(connection.peerSettings.getMaxFrameSize(-1)).isEqualTo(newMaxFrameSize)
    assertThat(connection.writer.maxDataLength()).isEqualTo(newMaxFrameSize)
  }

  /**