handleConnection method
Handles an upgraded WebSocket connection whose upgrade request matched
this service. Services that do not serve WebSockets should close the
connection.
Implementation
@override
FutureOr<void> handleConnection(Connection connection, HubRequest request) {
final onConnection = _onConnection;
if (onConnection == null) {
return super.handleConnection(connection, request);
}
return onConnection(connection, request);
}