keepalive-redirect-iframe.html

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<!doctype html>

<html>

<meta charset="utf-8">

<script>

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

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

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

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

const TOKEN = SEARCH_PARAMS.get('token') || '';

const url =

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

    `delay=500&` +

    `allow_headers=foo&` +

    `location=${ORIGIN2}/fetch/api/resources/stash-put.py?key=${TOKEN}%26value=on`;

addEventListener('load', () => {

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

  let p = fetch(url, {keepalive: true, headers});

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

});

</script>

</html>