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?

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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