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self.addEventListener('fetch', function(event) {
if (event.request.url.includes('dummy')) {
let destination = new URL(event.request.url).searchParams.get("dest");
if (event.request.destination == destination ||
(event.request.destination == "empty" && destination == "")) {
event.respondWith(fetch(event.request));
} else {
event.respondWith(Response.error());
}
}
});