I think it's just sort of a requirement for Facebook applications in general. For Facebook to be able to support SSL-enabled browsing, all the canvas apps have to be also support it. Someone please correct me if I'm wrong.
@kasperisager: That's almost exactly what I want to do.
I'm not sure what you mean by responsive rules, though. Could you please elaborate a bit?
Also, very cool that it works well to embed Vanilla in a Facebook tab like that. Nice to know. Ni…
My work-around was to make sure structure.php finds the category model class by including it at the top of structure.php:
(Adjust the /path/to/vanilla part …