“Access denied” error on Facebook Apps

Facebook’s new requirement to have all tabs and apps working over HTTPS got my dev team working frantically on fixing all active apps.

One of the apps I manage is particularly interesting, because assets for the app are hosted on an Akamai server. Here’s how it is set up:

Facebook settings

And when I try point Facebook tab to the secure version of the file that lives on Akamai, the page throws the “Access denied” error:

What’s the reason? Well, apparently Facebook iFrame apps/tabs request content via POST (as opposed to GET). On most servers this works fine by default. In a case of Akamai, POST requests have to be enabled or configured manually. Once POST requests are allowed, the page content will load fine.

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