server {
  listen  <port>
  gzip on;
  gzip_vary on;
  gzip_proxied any;
  gzip_comp_level 6;
  gzip_types
  text/plain
  text/css
  text/xml
  application/json
  application/javascript
  application/xml+rss
  application/atom+xml
  application/xhtml+xml
  application/xml
  image/svg+xml;
  ...
}