sw.js

var cache_name = 'ms-cache';
var cached_urls = [
  'index.html',
  '/',
  '/?source=pwa',
  'assets/css/me.css',
  'images/sig.png',
  'images/background-compressed-low.jpg',
  'images/manish_background_cropped.jpg',
  'images/background-compressed-low_cropped.jpg',
  'favicon-196x196.png',
  'https://fonts.googleapis.com/css?family=Roboto+Condensed'
];

self.addEventListener('install', function(event) {
  event.waitUntil(
    caches.open(cache_name)
    .then(function(cache) {
      return cache.addAll(cached_urls);
    })
  );
});

self.addEventListener('activate', function(event) {
  event.waitUntil(
    caches.keys().then(function(cacheNames) {
      return Promise.all(
        cacheNames.map(function(cacheName) {
          if (cacheName.startsWith('pages-cache-') && staticCacheName !== cacheName) {
            return caches.delete(cacheName);
          }
        })
      );
    })
  );
});

self.addEventListener('fetch', function(event) {
    console.log('Fetch event for ', event.request.url);
    event.respondWith(
      caches.match(event.request).then(function(response) {
        if (response) {
          console.log('Found ', event.request.url, ' in cache');
          return response;
        }
        console.log('Network request for ', event.request.url);
        return fetch(event.request).then(function(response) {
          if (response.status === 404) {
            return caches.match('index.html');
          }
          return caches.open(cached_urls).then(function(cache) {
           cache.put(event.request.url, response.clone());
            return response;
          });
        });
      }).catch(function(error) {
        console.log('Error, ', error);
        return caches.match('index.html');
      })
    );
  });