# File lib/rack/protection/strict_transport.rb, line 23
      def strict_transport
        @strict_transport ||= begin
          strict_transport = 'max-age=' + options[:max_age].to_s
          strict_transport += '; includeSubDomains' if options[:include_subdomains]
          strict_transport += '; preload' if options[:preload]
          strict_transport.to_str
        end
      end