As per fetch spec, User-Agent should be set
<rdar://problem/40293504>
Created attachment 341890 [details] Patch
Created attachment 341891 [details] Patch
Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/11319
Comment on attachment 341891 [details] Patch Clearing flags on attachment: 341891 Committed r232470: <https://trac.webkit.org/changeset/232470>
All reviewed patches have been landed. Closing bug.