byteCount: Int,
  ) {
    if (closed) throw IOException("closed")
    var flags = FLAG_NONE
    if (outFinished) flags = flags or FLAG_END_STREAM
    dataFrame(streamId, flags, source, byteCount)
  }

  @Throws(IOException::class)
  fun dataFrame(
    streamId: Int,
    flags: Int,
    buffer: Buffer?,
    byteCount: Int,
  ) {
    frameHeader(
      streamId = streamId,

    Http2Writer(out, true).goAway(lastGoodStreamId, errorCode, debugData)
    return out
  }

  private fun sendDataFrame(data: Buffer): Buffer {
    val out = Buffer()
    Http2Writer(out, true).dataFrame(expectedStreamId, FLAG_NONE, data, data.size.toInt())
    return out
  }

  private fun windowUpdate(windowSizeIncrement: Long): Buffer {
    val out = Buffer()