No cache only happend in certain cases.
example,after user fill up the form,if got any error,then they can click back button to do modification.
But if the form successfully save,then they are not allow to back anoymore ( the page is expired)
Caching instructions are sent when the page is first loaded, so you'd have no way of predicting whether or not the user was going to input an error and thus whether or not to cache.
Better to re-send the form (but filled in) if it fails validation in your back-end script, rather than rely on the [Back] button.
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