First get the project into the sample state by using the following commands:
$ git reset --hard
$ git checkout log-requestsOnce the task is complete, enter the Task ID: sw-waiting
Make a change to the Service Worker script. It can be anything. Then, refresh the page to pick up the new Service Worker.
Take a look at the Application tab in Chrome's developer tools and select Service Workers. At this point, you should see an active Service Worker and a new Service Worker in the waiting position.