WebSocket connection failed

[VerifyBot]

After testing my websockets app locally, I have deployed my web app to firebase hosting where it is available through https://someurl.web.app. Sadly the websocket does not seem to connect as I get the following error in the devtools console:

Note that this is an ngrok server, which works, as can be seen below:

I have not found anything related to this in the docs, issues or online.

Thank you 🙏

[aaugustin]

That might be https://stackoverflow.com/questions/22644392/chrome-websockets-cors-policy

You should enable debug logs on the server too (that's explained in the docs). Then you can see if:

1. the browser refuses to make the connection --> this has nothing to do with websockets; see the link I provided above for potential causes
2. websockets refuses to take the connection --> the logs should tell you what's happening.

[VerifyBot]

Thanks, I ended up realizing that a certificate from openssl isn't enough for the browsers, and that I needed to use Let's Encrypt to generate valid cert files.