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self.addEventListener('fetch', function(event) {
if (event.request.url.indexOf('sample.js') != -1) {
event.respondWith(new Promise(resolve => {
// Slightly delay the response so we ensure we get a non-zero
// duration.
setTimeout(_ => resolve(new Response('// Empty javascript')), 50);
}));
}
else if (event.request.url.indexOf('missing.jpg?SWRespondsWithFetch') != -1) {
event.respondWith(fetch('sample.txt?SWFetched'));
}
});