keepalive-redirect-window.html

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<!doctype html>

<html>

<meta charset="utf-8">

<script src="/common/utils.js"></script>

<script src="/common/get-host-info.sub.js"></script>

<script>

const TOKEN = token();

const {

  HTTP_NOTSAMESITE_ORIGIN,

  HTTP_REMOTE_ORIGIN,

  HTTP_REMOTE_ORIGIN_WITH_DIFFERENT_PORT

} = get_host_info();

const SEARCH_PARAMS = new URL(location.href).searchParams;

const WITH_HEADERS = !!SEARCH_PARAMS.has('with-headers');

const ORIGIN1 = SEARCH_PARAMS.get('origin1') || '';

const ORIGIN2 = SEARCH_PARAMS.get('origin2') || '';

const URL2 = SEARCH_PARAMS.get('url2') || '';

const REDIRECT_DESTINATION = URL2 ? URL2 :

  `${ORIGIN2}/fetch/api/resources/stash-put.py` +

  `?key=${TOKEN}&value=on`;

const FROM_URL =

    `${ORIGIN1}/fetch/api/resources/redirect.py?` +

    `delay=500&` +

    `allow_headers=foo&` +

    `location=${encodeURIComponent(REDIRECT_DESTINATION)}`;

addEventListener('load', () => {

  const headers = WITH_HEADERS ? {'foo': 'bar'} : undefined;

  const iframe = document.createElement('iframe');

  document.body.appendChild(iframe);

  iframe.contentWindow.addEventListener('unload', () => {

    iframe.contentWindow.fetch(FROM_URL, {keepalive: true, headers});

});

  window.opener.postMessage(TOKEN, '*');

  // Do NOT remove `iframe` here. We want to check the case where the nested

  // frame is implicitly closed by window closure.

});

</script>

</html>