Re: [whatwg/fetch] Add Stale While Revalidate Handling (#853)

So by default. Fetches that enter the fetch spec (not via Request.init(...))) ie. HTML spec and friends that are GET subresources may set the allows stale content flag. Which will cause an additional request that doesn't have the revalidation bit set on if the response received is stale.

If you are asking will this be eventually exposed such that service workers can explicitly request stale content it can be done in the future via an explicit API (say on the cache mode). But I don't believe it is needed at this time.

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