LayoutTests/http/tests/inspector/resource-tree/resources/manifest.php

<?php
    header("Expires: Thu, 01 Dec 2003 16:00:00 GMT");
    header("Cache-Control: no-cache, must-revalidate");
    header("Pragma: no-cache");
    header("Content-Type: text/cache-manifest");

    $manifestId = $_GET["manifestId"];

    echo("CACHE MANIFEST\n");
    echo("# " . $manifestId . "\n");
    echo("page-with-manifest.php?manifestId=" . $manifestId);
?>