How to Limit upload rate with nginx?

[magee meng]

I 've set up seafile 4.2.2, and seahub work with nginx 1.6.3.

For some reason, I need to limit user upload/download rate, the download rate limit is easy, just config the ngxin like this:

location /seafhttp {

            rewrite ^/seafhttp(.*)$ $1 break;

            proxy_pass http://127.0.0.1:8082;

            client_max_body_size 0;

            proxy_connect_timeout  3600s;

            proxy_read_timeout  3600s;

            limit_rate_after 3m;

            limit_rate 1m;

        }

The "limit_rate_after" and "limit_rate_after" is work fine. 

But I have no idea to Limit Upload Rate, Someone help me ？