Facebook iframe tab signed request always empty

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Okay, figured it out!
When configuring the app, I had filled in the “Tab URL” to be “tab/”
This made the full url to the tab page “http://www.example.com/myfacebookapp/tab/”
This made sense to me.

Apparently, Facebook doesn’t like this. After changing my “Tab URL” to ‘tab/index.php”, the signed request started to show up in the app tab!

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