nginx.conf

textserver {
    listen 80;
    server_name localhost;
    root /usr/share/nginx/html;
    index index.html;

    # Serve Frontend
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Proxy API with Forced CORS Headers
    location /api/ {
        proxy_pass http://backend:3000;

        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;

        # --- UPDATE THESE VALUES ---
        add_header 'Access-Control-Allow-Origin' 'http://<NAS_IP>:<PORT>' always;
        add_header 'Access-Control-Allow-Credentials' 'true' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS, PUT, DELETE, PATCH' always;
        add_header 'Access-Control-Allow-Headers' 'Content-Type, Authorization, X-Requested-With' always;

        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Allow-Origin' 'http://<NAS_IP>:<PORT>' always;
            add_header 'Access-Control-Allow-Credentials' 'true' always;
            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS, PUT, DELETE, PATCH' always;
            add_header 'Access-Control-Allow-Headers' 'Content-Type, Authorization, X-Requested-With' always;
            add_header 'Content-Length' 0;
            add_header 'Content-Type' 'text/plain charset=UTF-8';
            return 204;
        }
    }
}