close method
Closes the SSE connection.
connectionId is an optional unique identifier for the connection to close.
Implementation
@override
void close({String? connectionId}) {
if (connectionId != null) {
_connections[connectionId]?.close();
_connections.remove(connectionId);
} else {
for (var connection in _connections.values) {
connection.close();
}
_connections.clear();
}
}