Record the protocol an origin's responses arrived over.
h2 / h3 (and their drafts) widen that origin's data lane; anything else
reported narrows it back. An EMPTY protocol — what resource timing reports
for a cross-origin response without Timing-Allow-Origin — is "cannot tell"
and changes nothing, so such a host stays on the safe default.
Record the protocol an origin's responses arrived over.
h2/h3(and their drafts) widen that origin's data lane; anything else reported narrows it back. An EMPTY protocol — what resource timing reports for a cross-origin response withoutTiming-Allow-Origin— is "cannot tell" and changes nothing, so such a host stays on the safe default.