Sergey Biryukov 3977b6b06d Bootstrap/Load: Correct sending the X-Pingback header in WP::send_headers().
The logic for sending the `X-Pingback` header for single posts that allow pings was recently moved from `WP::handle_404()`​ to a more appropriate place in `WP::send_headers()`.

To check whether pings are open for a particular post, that logic relies on the `$wp_query` global, which is declared in `WP::handle_404()`, but not in `WP::send_headers()`

This commit ensures that `$wp_query` is globalized in `WP::send_headers()` too, so that the check works as expected.

Follow-up to [54250].

Props strategio, sabernhardt, dlh, davidbaumwald, SergeyBiryukov.
Fixes #56840.

git-svn-id: https://develop.svn.wordpress.org/trunk@54636 602fd350-edb4-49c9-b593-d223f7449a82
2022-10-18 16:09:50 +00:00
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