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<!DOCTYPE html>
<script>
window.addEventListener('DOMContentLoaded', () => {
const iframe = document.createElement('iframe');
const url = new URL(location.href);
url.hostname = url.hostname === 'localhost' ? '127.0.0.1' : 'localhost';
url.pathname = '/oopif.html';
iframe.src = url.toString();
document.body.appendChild(iframe);
}, false);
</script>