# File lib/em-http/middleware/digest_auth.rb, line 22
      def request(client, head, body)
        # Allow HTTP basic auth fallback
        if @is_digest_auth
          head['Authorization'] = build_auth_digest(client.req.method, client.req.uri.path, @opts.merge(@digest_params))
        else
          head['Authorization'] = [@opts[:username], @opts[:password]]
        end
        [head, body]
      end