public static function site_http($site_http = NULL)
 {
     if ($site_http === NULL) {
         return self::$site_http;
     } else {
         self::$site_http = CrayonUtil::url_slash($site_http);
     }
 }
 public static function upload_url($upload_url = NULL)
 {
     if ($upload_url === NULL) {
         return self::$upload_url;
     } else {
         self::$upload_url = CrayonUtil::url_slash($upload_url);
     }
 }