James Nylen 21b1135b1c 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.

Built from https://develop.svn.wordpress.org/trunk@40782


git-svn-id: http://core.svn.wordpress.org/trunk@40640 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2017-05-18 17:49:42 +00:00

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