Ticket #11694: 11694.diff

wp-includes/classes.php

@@ -484 +484 @@
                         $wp_query->set_404();
                         status_header( 404 );
                         nocache_headers();
+                } elseif ( is_singular() && get_query_var('page') > 1 ) {
+                        $pages = substr_count( $wp_query->posts[0]->post_content, '<!--nextpage-->' ) + 1;
+                        if ( get_query_var('page') > $pages ) {
+                                $wp_query->set_404();
+                                status_header( 404 );
+                                nocache_headers();
+                                // Disable Canonical redirects, as it'll guess the permalink for 404's.
+                                remove_action('template_redirect', 'redirect_canonical');
+                        } else {
+                                status_header( 200 );
+                        }
                 } elseif ( !is_404() ) {
                         status_header( 200 );
                 }