Browsers send an "Origin: null" header value for file and data URLs, as they can be generated by any document, and their origin is not guaranteed. Since we want to allow any URL to access the API (intentionally disabling the CORS protections), we need to special-case the non-URL "null" value. Props joehoyle. Fixes #40011. git-svn-id: https://develop.svn.wordpress.org/trunk@40600 602fd350-edb4-49c9-b593-d223f7449a82
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