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<!doctype html>
<body>
<script>
var current_url = window.location.href;
var fetch_url = current_url.substring(0, current_url.lastIndexOf("/")) + '/empty.html'
navigator.serviceWorker.addEventListener('message', e => {
if (e.data.fetchUrl == fetch_url) {
if (e.data.topicsHeader === 'null') {
window.opener.postMessage(
{testResult: 'Service worker intercepted no topics header'}, '*');
} else {
window.opener.postMessage(
{testResult: 'Service worker intercepted topics header'}, '*');
}
}
});
fetch(fetch_url, {browsingTopics: true});
</script>
</body>
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