var headerBlockLength = length
    if (flags and FLAG_PRIORITY != 0) {
      readPriority(handler, streamId)
      headerBlockLength -= 5 // account for above read.
    }
    headerBlockLength = lengthWithoutPadding(headerBlockLength, flags, padding)
    val headerBlock = readHeaderBlock(headerBlockLength, padding, flags, streamId)

    handler.headers(endStream, streamId, -1, headerBlock)
  }