Ticket #10722: 10722.5.patch

src/wp-includes/class-wp.php

@@ -611 +611 @@
         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;