server {
    listen 8080;

    location / {
        proxy_pass http://backend:${BACKEND_PORT};

        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        proxy_set_header Testing-Header "$remote_addr $host";
    }
}