Hitting Back after a form was submitted

You just hit the back button and you get this: “DOCUMENT EXPIRED!”  It looks bad and makes you think the site is busted.  What just happened was that when you went back it tried to resubmit a form! OH YEAH! I just submitted a form! but most people forget that and they see the error as a broken experience.  So here is a rule to follow.  Post/Redirect/Get pattern

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