File: file_page_xhr.html

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firefox-esr 128.13.0esr-1
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>

<script>
"use strict";

addEventListener("message", async function() {
  const url = new URL("/return_headers.sjs", location).href;

  const webpageFetchResult = await fetch(url).then(res => res.json());
  const webpageXhrResult = await new Promise(resolve => {
    const req = new XMLHttpRequest();
    req.open("GET", url);
    req.addEventListener("load", () => resolve(JSON.parse(req.responseText)),
                         {once: true});
    req.addEventListener("error", () => resolve({error: "webpage xhr failed to complete"}),
                         {once: true});
    req.send();
  });

  postMessage({
    type: "testPageGlobals",
    webpageFetchResult,
    webpageXhrResult,
  }, "*");
}, {once: true});
</script>

</body>
</html>