[w3c/ServiceWorker] Value of the Service-Worker request header (#1605)

Is it up to browsers to decide what value will be included in the  `Service-Worker` request header when an HTTP request is made to fetch a service worker's script resource?

I've noted that some browsers use `script` as the value for this header, but I couldn't find this information in the spec. 

I'm unsure if administrators should be looking for the  `Service-Worker: script` header specifically to detect the registration of a service worker.

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