Azure Web App for Containers how to enable websocket?

Question

ASP.NET

hello, I had an application deployed in openwork (Web app) the sockets worked there because there was a check mark

Recently I transferred the application to Web App for containers, but web sockets do not work there, I could not find the same check mark, how to enable sockets?

SignalR of course resolves by changing the protocol, but I want to use sockets.

Another problem with CORS was how to allow custom Header, Method? in the openwork settings, you can specify only the domain.