tokens: I 've noticed a common bug with browser back button usage on my web app where hitting the back button after logout loads a cached page where the user appears logged in ( though they are n't actually ) .
ner_tags: O O O O O O O B-Application B-User_Interface_Element I-User_Interface_Element O O O O O O O O B-User_Interface_Element I-User_Interface_Element O O O O O B-User_Interface_Element O O O O O O O O O O O O O O