[IMP] website_event_track_online: PWA adds prefetch for offline use

This commit adds the prefetch of the current page's children (cf. under
the same scope) to be available for offline use.

For performance reason, only the first-level children are added to the
cache to avoid a huge amount of requests and/or resources used by simply
loading the event website's pages. Also, for the same reason, this
process is delegated to the ServiceWorker to avoid cluttering the Main
Thread.

Note: due to some security restriction introduced in the Fetch spec,
some redirects may prevent offline-requests from being properly
fulfilled from the cache. See references for further details.

References:
- https://github.com/whatwg/fetch/issues/763
- https://github.com/GoogleChromeLabs/sw-precache/issues/220
- https://fetch.spec.whatwg.org/#concept-request-redirect-mode

closes odoo/odoo#56159

X-original-commit: bc9a306bc8b373daeaaf593ed0a0e6bc944279b8
Signed-off-by: Adrien Dieudonné (adr) <adr@odoo.com>
Signed-off-by: Pierre Paridans <pparidans@users.noreply.github.com>

0 files changed, 0 insertions, 0 deletions