root/LayoutTests/http/tests/navigation/back-to-get-after-post.php

<?php
if ($_SERVER['REQUEST_METHOD'] == "POST") {
    header("Location: resources/back-to-get-after-post-helper.html");
    exit;
}
?>
<form method=post>
<input type=submit></input>
<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.dumpBackForwardList();
    testRunner.waitUntilDone();
}

window.onload = setTimeout(function() {
    if (sessionStorage.getItem("backToGet") == null) {
        sessionStorage.setItem("backToGet", "step1");
        document.forms[0].submit();
    } else if (sessionStorage.getItem("backToGet") == "step2") {
        sessionStorage.setItem("backToGet", "step3");
        history.back();
    } else {
        sessionStorage.removeItem("backToGet");
        if (window.testRunner)
            testRunner.notifyDone();
    }
}, 0);
</script>
</form>