post method
Asynchronously sends this request to the server.
The subscription is guaranteed to have been created on server when the resulting future completes.
Implementation
Future<StateSubscription<M>> post() {
var topic = _client._requests.topic().withFilters(_type, ids: _ids, filters: _filters);
var builderInfo = theKnownTypes.findBuilderInfo(theKnownTypes.typeUrlFrom(_type))!;
return _client._subscribeToStateUpdates(topic, builderInfo);
}