how to configure the expires header if my static file is served by resin?

[Chen Bangzhong]

Hello, all

I use nginx as a reverse proxy and all traffic goes to resin. The
css/js files are also hosted on resin.

Now I want to add the expires directives to css/js, is the following
configuration correct?

location ~ .*\.(css|js)$
      {
          include proxy_params;
          proxy_pass http://back_end;
          #access_log        off;
          expires           6h;
      }

      location / {
          include proxy_params;
          proxy_pass http://back_end;
      }

thanks.