Today, in the continuation of my Grow With Google Udacity Scholarship, I learned about the Service Worker life cycle, and how to set up the service worker to HIJACK the requests!

in particular, I learned about the respondWith method, which in its basic form looks like this:

self.addEventListener('fetch', function(event) {

      new Response("I'm the body", {
        status: 200,
        headers: {
          'Content-Type': 'Text/Html'


this function takes a promise that resolves to a Response object, with a body blob and optionally an object filled with further config info for the response, like headers etc.

more complex uses of this method will involve fetch, more promise configs like async/await, or catch and some conditionals. I’m off to learn those now!