CI4 Best way to ignore specific url in $_SESSION['_ci_previous_url'

Digging into the issue further it looks like the javascript sendBeacon get's counted correctly as ajax when it does a POST but every so often the browser is sending  GET request at the same time from the same function when it shouldn't be. I started a stack thread specifcally to figure this out https://stackoverflow.com/questions/6292...t-and-post but my original post question is still valid in having a way to filter our specific urls' from getting saved. I tried setting up a "before" filter on the controller to manually set the $_SERVER['HTTP_X_REQUESTED_WITH']) = 'xmlhttprequest' so that whatever url I determine get's flagged as ajax however CI handles this before the filters happen so that didn't work.