server {
    listen 443 ssl;
    server_name DOMAIN;

    location / {
        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 X-Forwarded-Host  $server_name;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-Ssl   on;
        proxy_set_header Upgrade           $http_upgrade;
        proxy_set_header Connection        "upgrade";

        resolver 127.0.0.11;
        proxy_pass http://firefly_app_1:8080;
    }
}