WebSocket support ?

[sylvain-ri]

I'm happy with APIFlask for most endpoints.
In my project, we do have a few WebSockets endpoints, and there I do not know how to use APIFlask:

• how do i register WebSocket endpoints? Also with @app.route() ?
• how can i validate the websocket messages? If not possible to validate the messages, is it possible to define their structure with @app.input(Schema)? This needs to be applied to the messages, and not to the connection.