whole_func_string: function() {
        var args = norma('path:s?', arguments);
        var _url = url.format(_.clone(this.url));
        var _path = (args.path || '').replace(/^\//, '');
        return url.resolve(_url, _path);
      }
func_code_string: function() {
        var args = norma('path:s?', arguments);
        var _url = url.format(_.clone(this.url));
        var _path = (args.path || '').replace(/^\//, '');
        return url.resolve(_url, _path);
      }
func_documentation_string: append the request path.