Standard HTML forms in Facebook apps?

Facebook's recently deprecated FBML which means I'm having to do some extensive work re-writing company-developed apps. One such app had a contact form that was marked up using Facebook's FBM开发者_开发问答L request-form object.

I've since re-wrote this in vanilla HTML in my canvas application, but upon submitting the form I can't seem to access the POST data in my PHP handler. I've tried print_r($_POST) and print_r($_REQUEST) and there's nothing in there resembling my form's controls.

Any one know why this may be?

Have you checked if the page is redirecting? That could be the problem.

If so, this might help: http://forum.developers.facebook.net/viewtopic.php?id=34177#p297325