render_for_text

# File actionpack/lib/action_controller/base.rb, line 1111
      def render_for_text(text = nil, status = nil, append_response = false) #:nodoc:
        @performed_render = true

        response.headers['Status'] = interpret_status(status || DEFAULT_RENDER_STATUS_CODE)

        if append_response
          response.body ||= ''
          response.body << text.to_s
        else
          response.body = text.is_a?(Proc) ? text : text.to_s
        end
      end