Ticket #17771: 17771.patch

src/wp-includes/comment-functions.php

@@ -2288 +2288 @@
                 if ( $pingback_server_url ) {
                         @ set_time_limit( 60 );
                         // Now, the RPC call
-                        $pagelinkedfrom = get_permalink($post_ID);
+                        $pagelinkedfrom = get_permalink( $post_ID );
 
+                        if ( strlen( $pagelinkedfrom ) > 200 ) {
+                                $shortlink = wp_get_shortlink( $post_ID );
+                                $pagelinkedfrom = ! empty( $shortlink ) ? $shortlink : $pagelinkedfrom;
+                        }                       
+
                         // using a timeout of 3 seconds should be enough to cover slow servers
-                        $client = new WP_HTTP_IXR_Client($pingback_server_url);
+                        $client = new WP_HTTP_IXR_Client( $pingback_server_url );
                         $client->timeout = 3;
                         /**
                          * Filter the user agent sent when pinging-back a URL.