protected_instance_variables

# File actionpack/lib/action_controller/base.rb, line 1226
      def protected_instance_variables
        if view_controller_internals
          %w(@assigns @performed_redirect @performed_render)
        else
          %w(@assigns @performed_redirect @performed_render
             @_request @request @_response @response @_params @params
             @_session @session @_cookies @cookies
             @template @request_origin @parent_controller)
        end
      end