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Better example of custom service worker cache keys
var jsonDataRe = /example\.com\/(.*\.json)/;
self.addEventListener('fetch', function(event) {
var request = event.request,
match = jsonDataRe.exec(request.url);
if (match) {
// Use regex capturing to grab only the bit of the URL
// that we care about, ignoring query string, etc.
var cacheRequest = new Request(match[1]);
caches.match(cacheRequest).then(function(response) {
return response || fetch(request).then(function(response) {'mycache').then(function(cache) {
cache.put(cacheRequest, response);
return response;
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