Better illustrate the purpose

web/compromise.php

@@ -0,0 +1,9 @@
+<?php
+header('Cache-Control: s-max-age=60, stale-while-revalidate=82800');
+sleep(5);
+print('This is a slow test with data cached for 1 min but updated smartly so that for 23 hours people will experience a fast experience. ' . date('Y-m-d H:i:s'));
+?>
+<p id="js-date"></p>
+<script type="text/javascript">
+  document.getElementById('js-date').innerText = new Date().toISOString();
+</script>