Question

I have a app which url is like:

https://www.facebook.com/Foo/app_123456789

this app is running in a iframe and loading some urls of my server. At the start the user see a page like[1]:

www.foo.com/index.php

but in the app you also get pages like[2]:

https://foo.com/foo1/test/Tab/New/12345-6789

now the question:
is it possible to get a link which start with facebook.com/... and directly lead you to the [2] url?

Answer 1

Yes it is possible. You can add an extra variable to your URL like so:

https://www.facebook.com/Foo/app_123456789?app_data=any_string_here

Facebook will then send whatever inside the app_data variable to your iframe inside the singed_request. So all you have to do is to check for its presence (and value) and redirect the user accordingly.