Angular 2 Service Worker
Introduction
We will see how to set up a service working on angular, to allow our web app to have offline capabilities.
A Service worker is a special script which runs in the background in the browser and manages network requests to a given origin. It's originally installed by an app and stays resident on the user's machine/device. It's activated by the browser when a page from its origin is loaded and has the option to respond to HTTP requests during the page loading
