To enable content encryption in nginx, put the below configuration inside server block of nginx configuration file (usually in /etc/nginx/nginx.conf):
gzip on; gzip_disable "msie6"; gzip_http_version 1.1; gzip_comp_level 5; gzip_min_length 256; gzip_proxied any; gzip_vary on; gzip_types application/atom+xml application/javascript application/x-javascript application/json application/rss+xml application/vnd.ms-fontobject application/x-font-ttf application/x-web-app-manifest+json application/xhtml+xml application/xml font/opentype image/svg+xml image/x-icon text/css text/plain text/x-component;
You should get content size reduction unto 80%!