For example, using
websocat and trying to connect to it, returns an "unexpected status code (200 OK)", which my knowledge of HTTP says it is actually ok, but not so sure about websockets...
I think I figured it out:
I was checking WebSocket wiki page (https://en.wikipedia.org/wiki/WebSocket) and it has a JS example.
And then it hit me: I can do the same with the webdev console. And there, Firefox is complaining that it can connect to the service.
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