• https://cdn.bootcdn.net/ajax/libs/workbox-sw/6.0.0-alpha.2/workbox-sw.js
• https://cdn.bootcdn.net/ajax/libs/workbox-sw/6.0.0-alpha.2/workbox-sw.js.map
• https://cdn.bootcdn.net/ajax/libs/workbox-sw/6.0.0-alpha.2/workbox-sw.min.js