http {
    proxy_cache_path /var/cache/nginx/static levels=1:2 keys_zone=STATIC:50m max_size=500m;
    proxy_cache_path /var/cache/nginx/media levels=1:2 keys_zone=MEDIA:100m max_size=2g;
    
    server {
        location ~* \.(jpg|jpeg|png|gif|ico|css|js)$ {
            proxy_cache STATIC;
            proxy_cache_valid 200 1d;
            proxy_cache_use_stale error timeout updating;
            add_header X-Cache-Status $upstream_cache_status;
            expires 30d;
            access_log off;
        }
    }
}