Re: [w3c/ServiceWorker] support efficient offline redirects (#1457)

What would be the expected flow for these apps? When the service worker is being installed (or at some later point), requests would be preemptively made to these vanity urls to ensure that they are cached ahead of the user going offline? I recall that there are stability issues with this: i.e. if the request fails, it will invalidate the cache entry (?).

Also, would the resource ever be cached beyond the timeframe specified in its caching headers? I assume no? i.e. that the service worker would only prevent eviction up until the time specified by the resource cache headers.

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