routerAjaxStart never triggered

[phoebusryan]

• Framework7 version: 8.3.2
• Platform and Target: Every Browser
• Live Link or CodeSandbox: -

Describe the bug

I wanna add a custom header to each request. I found a way for that in your docs:
https://framework7.io/docs/view#event-routerAjaxStart
Problem is, this event never triggers. I even did not find it in your code.