To Avoid "Page Has Expired" Warnings in IE

To avoid "Page Has Expired" warnings, set session.cache_limiter to private, and make sure that any form using the POST method submits to an intermediate processing page that redirects the user to a different URL.

ini_set('session.cache_limiter', 'private');

or

ini_set('session.cache_limiter', 'must-revalidate');

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