render

# File actionpack/lib/action_controller/renderer.rb, line 71
    def render(*args)
      raise 'missing controller' unless controller

      request = ActionDispatch::Request.new @env
      request.routes = controller._routes

      instance = controller.new
      instance.set_request! request
      instance.set_response! controller.make_response!(request)
      instance.render_to_string(*args)
    end