| // Copyright 2017 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| console.log('ServiceWorker executed'); |
| |
| self.addEventListener('install', function (event) { |
| console.log('ServiceWorker install'); |
| }); |
| |
| self.addEventListener('fetch', function (event) { |
| // Replace main page with one that includes an image tag that can be |
| // preload scanned and prefetched. |
| console.log('Saw request ' + event.request.url); |
| if (event.request.url.endsWith('prerender/prefetch_page.html')) { |
| console.log('Intercepting ' + event.request.url); |
| var headers = new Headers; |
| headers.set('Content-Type', 'text/html; charset=UTF-8'); |
| var content = '<html><body><img src="/prerender/image.png"/></body></html>'; |
| var response = new Response(content, { |
| status: 200, |
| headers: headers }); |
| event.respondWith(response); |
| } |
| }); |
