Add Last-Event-ID
to CORS-safelisted request headers
#1788
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Since EventSource implementations in most environments already send this header without CORS preflight request, it makes sense to make it a safe-listed header.
See #568 for more background.
Last-Event-ID
to CORS-safelisted headers web-platform-tests/wpt#49257(See WHATWG Working Mode: Changes for more details.)
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