Facebook App URL Issue

I have an FBML app and a strange thing keeps happening.

If I go to http://apps.facebook.com/myapp/page2.php

I just get redirected to http://apps.facebook.com/myapp/index.php

It always goes back to index.php even though I specified page2.php and it is in the URL. This doesn't happen to my iframe apps.

开发者_运维技巧

Does anybody know why it's behaving this way?

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htaccess rewrites

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Seems like making the canvas callback URL http://WWW.example.com rather than just http://example.com fixed the problem.

But why???