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Add Service-Worker header to checkValidServiceWorker

Merged Administrator requested to merge github/fork/darthmaim/feature/service-worker-header into master

Created by: darthmaim

This PR adds the http header Service-Worker: script to the checkValidServiceWorker request in both serviceWorker templates, to match the spec on how to request a service worker.

See https://w3c.github.io/ServiceWorker/#update-algorithm:

To perform the fetch given request, run the following steps:

  1. Append Service-Worker/script to request’s header list.

And https://w3c.github.io/ServiceWorker/#service-worker-script-request:

An HTTP request to fetch a service worker's script resource will include the following header:

  • Service-Worker Indicates this request is a service worker's script resource request.