Let's consider I have got the access token and works with the API successfully during some time. At some point the user restricts the access for my App in the twitter's application tab or by some other means. It would be a good idea to let my app to know about that so I won't send useless requests. How my app shoud be notified if the access token is revoked? Maybe during request I will get the special error that indicates that or twitter will send me notification about that?
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