How to test HTTP Keep alive is actually working

I know HTTP keep-alive is on by default in HTTP 1.1 but I want to find a way to confirm that it is actually working.

Does anyone know of a simple way to test from a web browser (EG how to make sense of wireshark). I know I need to look for multiple HTTP requests over the same TCP connection but I don't know how to confirm that in wireshark or any other way.

Thanks!