From 4315a8867dc1d11b5d6b708e114dd19920059f97 Mon Sep 17 00:00:00 2001
From: "Dominik Schilling (ocean90)" <ocean90@git.wordpress.org>
Date: Tue, 23 Feb 2016 16:07:39 +0000
Subject: [PATCH] In `WP::handle_404()` introduce a filter `pre_handle_404` to
 short-circuit default header status handling.

This comes handy if you use WordPress without posts, means `$wp_query` contains no results.

Props prettyboymp, hakre, prettyboymp, Denis-de-Bernardy, ethitter, ocean90.
Fixes #10722.

git-svn-id: https://develop.svn.wordpress.org/trunk@36629 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/class-wp.php | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/wp-includes/class-wp.php b/src/wp-includes/class-wp.php
index 238e2e6660..74ea29fe6f 100644
--- a/src/wp-includes/class-wp.php
+++ b/src/wp-includes/class-wp.php
@@ -629,6 +629,21 @@ class WP {
 	public function handle_404() {
 		global $wp_query;
 
+		/**
+		 * Filter whether to short-circuit default header status handling.
+		 *
+		 * Returning a non-false value from the filter will short-circuit the handling
+		 * and return early.
+		 *
+		 * @since 4.5.0
+		 *
+		 * @param bool     $preempt  Whether to short-circuit default header status handling. Default false.
+		 * @param WP_Query $wp_query WordPress Query object.
+		 */
+		if ( false !== apply_filters( 'pre_handle_404', false, $wp_query ) ) {
+			return;
+		}
+
 		// If we've already issued a 404, bail.
 		if ( is_404() )
 			return;