# File lib/mixlib/authentication/http_authentication_request.rb, line 71
      def request_signature
        unless @request_signature
          @request_signature = headers.find_all { |h| h[0].to_s =~ /^x_ops_authorization_/ }
            .sort { |x, y| x.to_s[/\d+/].to_i <=> y.to_s[/\d+/].to_i }.map { |i| i[1] }.join("\n")
          Mixlib::Authentication::Log.trace "Reconstituted (user-supplied) request signature: #{@request_signature}"
        end
        @request_signature
      end