Ryan McCue 03ba67a0b7 REST API: Allow explicit HEAD callbacks.
HEAD callbacks can now be registered independently, with the GET
callback still used as a fallback.

Fixes #34841.

Built from https://develop.svn.wordpress.org/trunk@36535


git-svn-id: http://core.svn.wordpress.org/trunk@36502 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-02-16 05:51:26 +00:00
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