There's really no reason to use AppEngine these days. I believe it still exists for legacy apps. You should be using Cloud run. Cloud run support WebSockets[1].

There's really no reason to use AppEngine these days. I believe it still exists for legacy apps. You should be using Cloud run. Cloud run support WebSockets[1]. If you already have an AppEngine App you can always keep it and create a CloudRun app to handle the WebSocket part and they communicate well. [1]: https://cloud.google.com/run/docs/triggering/websockets https://cloud.google.com/run/docs/triggering/websockets