    public static function post($vars) {
        switch (SMART_URL) {
            case true:
                # code...
                $url = Site::$url."/".self::slug($vars)."/{$vars}";
                break;
            
            default:
                # code...
                $url = Site::$url."/index.php?post={$vars}";
                break;

        }

        return $url;
    }
The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request.