Re: [w3c/ServiceWorker] Service-Worker-Allowed can be cross-origin to the script URL. (#1307)

@mattto We tripped into a similar issue, however, in our case everything was on the same origin. When doing,

    navigator.serviceWorker.register("/js/sw.js", { scope: "/" })

This failed with the error `Failed to register a ServiceWorker: The path of the provided scope...`

The fix is to add the `Service-Worker-Allowed` header seems to trip up quite a few people. Is there any reason to add this header if the request is **not** cross-origin?


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