rack_response

# File actionpack/lib/action_dispatch/http/response.rb, line 391
    def rack_response(status, header)
      assign_default_content_type_and_charset!(header)
      handle_conditional_get!

      header[SET_COOKIE] = header[SET_COOKIE].join("\n") if header[SET_COOKIE].respond_to?(:join)

      if NO_CONTENT_CODES.include?(@status)
        header.delete CONTENT_TYPE
        [status, header, []]
      else
        [status, header, RackBody.new(self)]
      end
    end