I came from this question
https://github.com/socketio/socket.io/issues/4263
In IOS 15 environment, WSS cannot connect, but WS can link. No matter how to replace the certificate, the result of TLS is the same!
This problem has plagued us for a long time! Hope to get attention!
sandywk
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution