Cocoa and SOUP added Timing-Allow-Origin checks in bug 226678 and bug 227008. However, this has not yet been added in Curl port.
Pull request: https://github.com/WebKit/WebKit/pull/5802
Committed 256044@main (3f6d008b5fa7): <https://commits.webkit.org/256044@main> Reviewed commits have been landed. Closing PR #5802 and removing active labels.
<rdar://problem/101614371>