When trying to understand the behavior of web apps, I find myself stumbling against the fact that some network messages do not appear on the network tab of the web developer tool of the browser. For example, on the web app of whatsapp (https://web.whatsapp.com/) sending or receiving a message will not leave a line on the network tab.
Here's what I tried to do:
- Try other browsers. I tried firefox, chrome, safari, they all show the same issue
- Try network sniffing tools. I got lost because there are so many connections I didn't know which one to monitor
- Noticed there was a service worker. I thought maybe the requests back and forth to the server would be made by the service worker. It did not appear to be the case, and it seemed anyway that service worker requests should appear in the network tab.
Any explanation or pointer much appreciated.