# File lib/bullet/rack.rb, line 33
    def empty?(response)
      # response may be ["Not Found"], ["Move Permanently"], etc.
      if rails?
        (response.is_a?(Array) && response.size <= 1) ||
          !response.respond_to?(:body) ||
          !response_body(response).respond_to?(:empty?) ||
          response_body(response).empty?
      else
        body = response_body(response)
        body.nil? || body.empty?
      end
    end