Some servers seem to expect 'Accept-Encoding : identity' to serve Range requests #747

As part of https://bugs.webkit.org/show_bug.cgi?id=184447, it seems https://test.shhnjk.com/media_test.html server is requiring 'Accept-Encoding : identity' to be in a request to serve range responses.
That might create some issues with multimedia loads intercepted by service workers.