closeRead method
Sends STOP_SENDING; further data from the remote is discarded.
Implementation
@override
Future<void> closeRead() async {
if (_localReadClosed || _reset != null) return;
_localReadClosed = true;
_readQueue.clear();
_sendFlag(FrameFlag.stopSending);
_wakeReaders();
_closeChannelIfDone();
}