I've been developing a Facebook app using Google App Engine in Python and the pyfacebook bindings. For weeks everything worked fine but suddenly it stopped.

At first I thought it was a code change so I rolled back the entire dev directory to a version I knew worked, but still it failed. It's possible a change I made to the application's settings caused the issue but, if so, I can't figure out what.

I've figured out that the problem is that instead of calling the post(self) method of my Main class, Facebook is calling using a GET.

Does anyone know why Facebook would use a GET method instead of a POST? It's an IFrame app.

Thanks,