Re: [w3c/ServiceWorker] importScripts request does not include Service-Worker header (#1538)

The header isn't optional, it's included on the request for the service worker script, always. It isn't included on additional requests made by that script, including fetch and importScripts.

It's definitely mentioned in the spec - it's requires that header to be there on root service worker scripts, and it requires it isn't there on other requests.

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