<!DOCTYPE html>
<html>
<body>
    <div id="testDiv"></div>
    <h3>The iframe making an image load.</h3>
    <script src="/common/get-host-info.sub.js"></script>
    <script>
const host = get_host_info();
const baseURL = host.HTTP_ORIGIN + window.location.pathname.replace(/\/[^\/]*$/, '/') ;
const ok = true;
const ko = false;

const img = new Image();
img.src = baseURL + "image.py?corp=same-origin&cached";
img.onload = () => { parent.postMessage("ok", "*") };
img.onerror = () => { parent.postMessage("ko", "*") };
testDiv.appendChild(img);
    </script>
</body>
</html>
