server {
    listen 80;

    location /assets {
        resolver 127.0.0.11;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        set $upstream_proto http;
        set $upstream_host assets;
        set $upstream_port 7878;

        proxy_pass $upstream_proto://$upstream_host:$upstream_port;
    }
}