nginx.conf

pid /tmp/nginx.pid;
worker_processes 1;
events { worker_connections 1024; }

http {
    include       mime.types;
    default_type  application/octet-stream;

    # Upstream for your backend Socket.IO server
    upstream backend_socketio {
        server 127.0.0.1:5000;
    }

    # Upstream for your frontend Next.js server
    upstream frontend_nextjs {
        server 127.0.0.1:3001;
    }

    server {
        listen 3000;

        # Proxy /socket.io/ requests to backend on port 5000
        location /socket.io/ {
            proxy_pass http://backend_socketio;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            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_cache_bypass $http_upgrade;
        }

        # Serve the frontend Next.js app
        location / {
            proxy_pass http://frontend_nextjs;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection 'upgrade';
            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-Proto $scheme;
            proxy_cache_bypass $http_upgrade;
        }
    }
}