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Right now, if I set my facebook application url to: http://www.example.com, then all requests from http://example.com don't work. If I set the url to just http://example.com from within facebook, then all requests from http://www.example.com don't work.

How can I fix this so it'll work in both places?

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It should work with www.example.com as the website url and example.com in your 'app domains', no? –  Igy Jan 19 '13 at 15:59
@Igy Yes, that was it, the app domain wasn't set, setting it fixed it. Post as answer if you like and I'll accept. –  Click Upvote Jan 19 '13 at 20:48
possible duplicate of Facebook API error 191 –  Igy Jan 19 '13 at 22:13
Voted to merge with the 'standard' 191 error question instead, it's the same fix usually –  Igy Jan 19 '13 at 22:14
@Igy That error is obsolete since I didn't get this error from them. So IMO this question should have its own answer to help people who have this problem in future. –  Click Upvote Jan 19 '13 at 22:38

1 Answer 1

up vote 0 down vote accepted

Setting an app domain in facebook app settings fixed this issue.

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