facebook/facebook-ios-sdk — pull request #555 by jeromelebel (2013-08-14 15:21:54+00:00)
Title: when cancelling an apprequest, we don't receive a cancel, but we don't receive a post_id neither

to reproduce the problem, I have to call -[Facebook dialog:andParams:andDelegate:], with @"apprequests". If the user click on cancel, we receive @"fbconnect://success" (or this is not a success). This is the work around for that problem