PWA Day06 - on network response

sw.js

self.addEventListener('fetch', function(event) {
  event.respondWith(
    self
      .caches
      .open('mysite-dynamic')
      .then(function(cache) {
        return cache
          .match(event.request)
          .then(function (response) {
            if (response != null) {
              return response
            }

            return fetch(event.request)
              .then(function(response) {
                cache.put(event.request, response.clone())

                return response
              })
        })
      })
  )
})