This commit allows to filter out the requests to local-ish domains (cf.
the current host and an optionally configured CDN for the current
website) and preventing from cluttering the cache used by the
ServiceWorker with tracking files, scripts or other non-necessary
assets.
This allows to even further reduce the possible "opaque" requests from
being stored in the cache (as they use way more space than regular/basic
responses).
X-original-commit: 052bc7665e89426fb51928e43bd4a15dbf6cb705