Facebook only allows its authorization system to redirect to one URL… for me it is index.php. Typically, when I release new things I release them to test.php or something similar before replacing index, so that I can make sure it works.
Is this possible with Facebook? Or do i just have to release every update straight to index.php and pray it works or debug as quickly as possible if it doesn’t?
Here is the Facebook error

As far as I know, redirect_uri can be different on the same domain, so I don’t think you will have some problems using another redirect_uri