FWD

events {}

http {

    upstream backend_servers {

        server FWD_server:7443;

    }

    server {

        listen 7443;

        location / {

            proxy_pass https://backend_servers;

            # --- Standard Proxy Headers (Sent to App) ---

            proxy_set_header Host $host;

            proxy_set_header X-Real-IP $remote_addr;

            # --- NEW: Custom Response Header (Sent to User) ---

            # This adds a header named 'X-Server-IP' to the response you receive.

            # $upstream_addr holds the IP:Port of the actual container that served the request.

            add_header X-Server-IP $upstream_addr always;

        }

    }

}