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POHandle invalid accessToken with FBSession openActiveSessionWithReadPermissions in Facebook iOS 3.1.1 SDK
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copied!<p>Before anything, I have read both <a href="https://stackoverflow.com/questions/12612629/expired-access-token-after-openactivesession-for-facebook-ios-sdk">this</a> and <a href="https://stackoverflow.com/questions/12601191/facebook-sdk-3-1-error-validating-access-token">this</a> questions to solve the problem below and before asking.</p> <p>My problem is that when the accessToken gets expired (either because the expiration date passes, or manually by deleting the app from my Facebook's App Center) the following code:</p> <pre><code>if ([[FBSession activeSession] isOpen]) { //do something } else { [FBSession openActiveSessionWithReadPermissions:nil allowLoginUI:YES completionHandler:^(FBSession *session, FBSessionState status, NSError *error) { if(FB_ISSESSIONOPENWITHSTATE(status)) { //do something } } }]; } </code></pre> <p>gets in the else block with FBSession.activeSession open but when the 'do something' is executed the accessToken is invalid so the request gets Error: HTTP status code: 400. When I try to do the whole procedure twice immediately the FBSession asks for permission (either UIAlertView for iOS6 integrated facebook, Facebook App or Facebook website in Safari) and the rest runs smoothly.</p> <p>My concern is why I have to do everything twice to work well and why Facebook SDK cannot detect in the first time that the activeSession and accessToken are invalid.</p> <p>Thank you all in advance!</p>

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