ServiceWorker

7deb2380 - Fetch service worker scripts with "no-cache" by default (#1020)

Fetch service worker scripts with "no-cache" by default (#1020) This introduces service worker registration's use cache field and its related APIs: options.useCache to register method and registration.useCache for ServiceWorkerRegistration objects. This changes the default cache mode of fetching SW scripts to "no-cache". After the change, 24 hours limit and job's force bypass cache flag rules are still enforced. register() method's options value set to { useCache: true } re-enables the previous default behavior provided before this change. Fixes #893 #894.