[w3c/ServiceWorker] Why does spec set redirect's mode to error ? (#1366)

I don't really understand why we have this in the spec.

This causes trouble when redirection websites to new urls.
If you want to redirect some old-website to new-website, you'd think you just need to 301 redirect from old-website to new-website. The problem is that doing so the service-worker won't update and serve the cached content. The only solution found for now is to redirect everything from old-website except /service-worker.js that serves a custom service-worker that unregister the current service-worker.

Is there any other way to tackle the problem ?

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