method_missing

# File actionpack/lib/action_controller/integration.rb, line 558
      def method_missing(sym, *args, &block)
        reset! unless @integration_session
        if @integration_session.respond_to?(sym)
          returning @integration_session.__send__(sym, *args, &block) do
            copy_session_variables!
          end
        else
          super
        end
      end