Ticket #25840: 25840.2.diff

wp-includes/class-http.php

@@ -519 +519 @@
                 if ( $check['host'] == 'localhost' || $check['host'] == $home['host'] )
                         return apply_filters('block_local_requests', false);
 
-                if ( !defined('WP_ACCESSIBLE_HOSTS') )
-                        return true;
-
                 static $accessible_hosts;
                 static $wildcard_regex = false;
                 if ( null == $accessible_hosts ) {
-                        $accessible_hosts = preg_split('|,\s*|', WP_ACCESSIBLE_HOSTS);
 
+                        /**
+                         * Filter the list of accessible hosts.
+                         *
+                         * @since 3.8
+                         *
+                         * @param array List of accessible hosts
+                         */
+                        $accessible_hosts = ! defined( 'WP_ACCESSIBLE_HOSTS' ) ? array() : preg_split( '|,\s*|', WP_ACCESSIBLE_HOSTS );
+                        $accessible_hosts = apply_filters( 'wp_http_accessible_hosts', $accessible_hosts );
+
+                        if ( empty( $acccessible_hosts ) )
+                                return true;
+
                         if ( false !== strpos(WP_ACCESSIBLE_HOSTS, '*') ) {
                                 $wildcard_regex = array();
                                 foreach ( $accessible_hosts as $host )