Re: [ServiceWorker] Receivers of ranged responses must ensure all ranges come from the same underlying resource (#703)

@horo-t no, it should be handled by the SW. What is unclear to me is what layer should be responsible for setting the range headers?

* API
* Fetch
  * Before service worker
  * Service worker
  * After service worker
  * Cache/Network

That determines how observable they are (most headers such as `User-Agent` and `If-Modified-Since` are set in the Cache/Network part and therefore not observable to service workers).

Separately we need to decide what happens with synthetic 206 responses.

@mayhemer you probably want to review this thread.

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