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chromium/third_party/blink/web_tests/external/wpt/resource-timing/resources/fake_responses_https.sub.html 

<body>
<script>
function request() {
  var client = new XMLHttpRequest,
      baseurl = "https://{{hosts[alt][]}}:{{ports[https][0]}}{{location[pathname]}}",
      url = new URL("fake_responses.py", baseurl).href;
    client.open("GET", url, false)
    client.send(null)
    client.open("GET", url, false)
    client.send(null)
}

if(window.parent.setup_iframe) {
  window.parent.setup_iframe();
  request();
}
</script>
</body>