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<html>
<head>
<script>
function loaded() {
addEventListener("message", ({ data }) => {
document.getElementById("form").action = data;
document.getElementById("button").click();
}, { once: true });
opener.postMessage("loaded", "*");
}
</script>
</head>
<body onload="loaded();">
<form id="form" method="POST">
<input id="button" type="submit" />
</form>
</body>
</html>