PWA offline page

A service worker is a type of web worker . It’s essentially a JavaScript file that runs separately from the main browser thread, intercepting network requests, caching or retrieving resources from the cache, and delivering push messages.

First, create a blank file called sw. js and place it in the /app folder . The location of the service worker is important! For security reasons, a service worker can only control the pages that are in its same directory or its subdirectories.27 Eyl 2019

Clear the service worker cache Go to Cache Storage in DevTools. In the Application panel, expand Cache Storage. Right-click the cache name and then select Delete.

A service worker file is a script that your browser runs in the background, separate from a web page, opening the door to features that don’t need a web page or user interaction . Today, it already includes features like push notifications and background sync.