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I'm confused. How does that help? You submit the form action to ?foo=1 for initial processing, but you can still refresh and do it all over again.
Though, now that I think of it, you can use a header redirect after the form's been processed and they won't be able to hit refresh or click back to submit that same form. Though, that doesn't prevent them from navigating to the original form and filling it out again. You'd need to check something like cookies or ip or browser for that.
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