proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=static_cache:100m inactive=7d use_temp_path=off;
proxy_cache_path /var/cache/nginx/img levels=1:2 keys_zone=img_cache:200m inactive=30d use_temp_path=off;
map $request_uri $cache_type {
    default "none";
    ~*\.(jpg|jpeg|png|gif|ico|webp)$ "img";
    ~*\.(css|js|woff2?|ttf|eot|svg)$ "static";
}
add_header X-Cache-Status $upstream_cache_status;