I noticed when I sign out from one of google services like google mail, all the other google services (for example calendar, drive) that I’m using in other browser tabs show session expired popup that redirects to login page.
The session expired popup shows almost immediately after I sign out.
I assume google auth server somehow sends notifications to google frontends when user session is changed. So, I looked into chromes network tab to see if websockets were used to implement such bidirectional communication, but no websockets seemed to be used.
How do google services implemented bidirectional communication between their frontends and auth server??
If server sent events were used, how can I see server sent events in chromes network tab?