Yes. This is an old way of doing it and not supported by plugins (only by the udp listener). It is best to always use a valid action. So in this case you should use.
http://127.0.0.1:8081/api/VC.TriggerEvent&&JarvisI realize this is inconsistent, and I apologize for that, but the other method is a vestigial one, and I did not want to remove it for fear of breaking things that people already had set up. Please consider it deprecated though.