gzip compression does not work in nginx server

Hi,
I have installed Wp Fastest Cache Plugin..! I’m using nginx Server.
and I’m using this code on my nginx file as you mentioned this in your Plugin:
gzip on;
gzip_vary on;
gzip_proxied any;
gzip_comp_level 6;
gzip_buffers 16 8k;
gzip_http_version 1.1;
gzip_types image/svg+xml text/plain text/html text/xml text/css text/javascript application/xml application/xhtml+xml application/rss+xml application/javascript application/x-javascript application/x-font-ttf application/vnd.ms-fontobject font/opentype font/ttf font/eot font/otf;

But this code does’nt work in my site. Please let me know! What is the reason???
Thanks!

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