stop method
Stops/closes this server.
Implementation
Future<void> stop() async {
  if (!_started || _stopping || isStopped) return;
  _stopping = true;
  await _stopImpl();
  _stoppedCompleter.complete(true);
}Stops/closes this server.
Future<void> stop() async {
  if (!_started || _stopping || isStopped) return;
  _stopping = true;
  await _stopImpl();
  _stoppedCompleter.complete(true);
}