I completely overlooked this in the docs. So if you are here you either didn’t look in the docs or overlooked it also.
I was doing something like this
return (user.get_absolute_url(), (), {})
Now that sends the user to
/user/username/
I wanted the user to go to
/u/username/
So in your settings.py file just do this
ABSOLUTE_URL_OVERRIDES = {
'auth.user': lambda o: "/u/%s/" % o.username,
}