redirect_to_directory_uri

# File lib/webrick/httpservlet/abstract.rb, line 141
      def redirect_to_directory_uri(req, res)
        if req.path[-1] != //
          location = WEBrick::HTTPUtils.escape_path(req.path + "/")
          if req.query_string && req.query_string.bytesize > 0
            location << "?" << req.query_string
          end
          res.set_redirect(HTTPStatus::MovedPermanently, location)
        end
      end