请问这样的语句正确不（ nginx 控制带宽）

[aliehuhu]

搭建了个附件服务器，装的是 lnmp。最近服务器带宽使用量严重超标，影响正常访问。估计是被人采集了。请问图中蓝色框框的语句可以限制采集者的下载速度吗？
文件是：/usr/local/nginx/conf/vhost/域名.conf
我也不知道加的对不对。

[msg7086]

Limits the rate of response transmission to a client. The rate is specified in bytes per second. The zero value disables rate limiting. ****The limit is set per a request, and so if a client simultaneously opens two connections, the overall rate will be twice as much as the specified limit. ****