I have an application using angular and nodejs for the frontend.
I have integrated a chat app using socket.io for nodejs, in my localhost it works fine.
For the deployment, I have configured two subdomains one for the backend and the other for the angular app to communicate safely.
I have added an SSL Certificate for the backend subdomain “backendapi.app.com” and the subdomain for the app “backoffice.app.com” .
I have doing that to configure cors and access api via frontend with safely mode and all works fine.
When I deployed my new version with the chat app, an error showed on the console :
GET https://backendapi.app.com/socket.io/?EIO=4&transport=polling&t=P7SX7Ir