Reactive web - idle timeout warning

Good afternoon all.   We are working on our first reactive web application, and one of the requirements is to warn idle users that they will be logged out in 5 minutes and then again when they will be logged out in 1 minute.   From what I've seen the MAX_IDLE_TIME will handle the actual logout functionality but I have not been able to find a way to implement the warnings.   Any suggestions?

Also, just for my understanding.  If a user is on a particular screen and they reach the MAX_IDLE_TIME they will not automatically be redirected to the Login screen.   That will not occur until the next time the user attempts to fetch data from the server, is this accurate?

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There is good information in that link, but I see nothing about popping a warning message when session expiration is imminent.