James Nylen 50f8eff5d1 REST API: Do not set X-WP-Deprecated* headers as often.
Only set these headers if (1) `WP_DEBUG` is enabled and (2) headers have not already been sent.

Previously, this code could generate warnings by trying to set a header after response data has already been sent.  This happens when code attached to the `shutdown` filter calls a deprecated function, for example.

Also, these headers are unlikely to be useful in the majority of cases; let's only send them if `WP_DEBUG` is enabled.

Props kraftbj, jnylen0, ocean90, rmccue.
Fixes #40787.


git-svn-id: https://develop.svn.wordpress.org/trunk@40782 602fd350-edb4-49c9-b593-d223f7449a82
2017-05-18 17:48:38 +00:00
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