chromium/src/third_party/blink/web_tests/http/tests/cache/resources/max-age-resource.html

<h1></h1>
<script src="random-max-age.cgi"></script>
<script>
// Random.cgi will include a global "randomNumber".
// Always send this back to our opener.
opener.postMessage(randomNumber, '*');

// Our opener will tell us to perform various loads.
window.addEventListener('message', function(event) {

    // Go forward and back.
    if (event.data === 'go-forward-and-back') {
        window.location = 'max-age-resource-forward.html';
        return;
    }

    // Reload.
    if (event.data === 'reload') {
        window.location.reload();
        return;
    }

    // Normal navigation, next.
    if (event.data === 'next') {
        window.location = 'max-age-resource-next.html';
        return;
    }

}, false);
</script>