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self.addEventListener('fetch', event => {
event.waitUntil(async function () {
if (!event.clientId) return;
const client = await clients.get(event.clientId);
if (!client) return;
client.postMessage({
fetchUrl: event.request.url,
topicsHeader: String(event.request.headers.get("Sec-Browsing-Topics"))
});
}());
});