Aaron Jorbin 246aa65a19 REST API: Include Vary: Origin in cors headers
`vary: origin` is a W3 CORS implementation recommendation( https://www.w3.org/TR/cors/#resource-implementation ). It's used by default in frameworks such as hapi and Laravel-cors. Overall, it helps sites siting behind a cache such as varnish.

Fixes #38060.
Props procodewp, pdufour for research.



git-svn-id: https://develop.svn.wordpress.org/trunk@38806 602fd350-edb4-49c9-b593-d223f7449a82
2016-10-17 16:10:37 +00:00
2016-09-06 18:12:09 +00:00
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