Re: [w3c/ServiceWorker] How to test "no-referrer-when-downgrade" in a web platform test (#1094)

I build a little test-case https://cdn.rawgit.com/jakearchibald/0e3e6ae11fa354ca6ba1183efebc002d/raw/bf7a76470ba48b33d95c5a862997d7ab99769774/

Currently both Firefox and Chrome fail to fetch in the `event.respondWith(fetch(event.request))` case, so neither implement https://w3c.github.io/webappsec-mixed-content/#is-passthrough.

Our intention was to have `event.respondWith(fetch(event.request))` behave as much as possible like no-serviceworker, and to allow the caching of mixed content resources to make it possible to build a podcast player.

I'd like to hear from Apple & MS. If there's no interest in this passthrough stuff, we could give up & remove it.

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