How to prevent form resubmission when page is refreshed (F5 / CTRL+R)

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I would also like to point out that you can use a javascript approach, window.history.replaceState to prevent a resubmit on refresh and back button.

<script>
    if ( window.history.replaceState ) {
        window.history.replaceState( null, null, window.location.href );
    }
</script>

Proof of concept here: https://dtbaker.net/files/prevent-post-resubmit.php (Link no longer works)

I would still recommend a Post/Redirect/Get approach, but this is a novel JS solution.

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