Safari Experimental Feature disappeared in v15

Hello,

in order to workaround non-working websockets with TLSv1.3 I was enabling NSURLSession WebSocket experimental feature.

I've recently got a new MacBook with a brand new MacOS and latest Safari 15, where I found non-working websockets and didn't found NSURLSession WebSocket option.

I am not sure at what point/version mentioned feature disappeared from the Develop menu...

Is there any other way to enable it? Why it was removed?

Anton

Safari Experimental Feature disappeared in v15
 
 
Q