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

They use normal redirects today, but the problem is http cache eviction.  Users often type vanity.com while offline and get a broken tab instead of redirected to the offline assets on actual.com.

For the sites I've spoken to the vanity.com service worker solution would still result in a 301 response, just synthetically instead of from the network stack.  In theory browsers could still integrate that into things like awesomebar.

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