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I have a Facebook app that can’t be used before a user log in via Facebook (OAuth). Some pages (e.g. example.com/books/2) should be accessible for Open Graph requests (when they have been liked). Currently, Facebook isn’t able to retrieve those pages since authentication is required (redirect). How can I determine if an incoming request is coming from Facebook or not? Or should I take another approch?
Thank you!
Just add an exception so that Facebook’s crawler can reach the page, The user agent is currently
facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)(but the version number may increment someday)