nginx-conf

server {
    listen 80;
    server_name IP/DOMAIN; # Change to your Public IP Address or use a Domain with DNS A Record pointed to your Public IP address

    # Main location block to serve your application at /
    location / {
        # Create a user ` htpasswd -c /etc/nginx/.htpasswd USERNAMEHERE `
        auth_basic "Restricted Area";  # This is the realm name that will appear in the authentication dialog
        auth_basic_user_file /etc/nginx/.htpasswd;
        
        proxy_pass http://127.0.0.1:3000/;
        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_set_header X-Forwarded-Host $host;
        
        proxy_set_header Origin http://127.0.0.1:3000;

        # Prevent proxying loops
        proxy_redirect off;

        # Allow serving static assets correctly
        try_files $uri $uri/ @proxy;

        # Disable buffering for proxied responses
        proxy_buffering off;
    }

    # Fallback for anything that doesn't match
    location @proxy {
        proxy_pass http://127.0.0.1:3000;
        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_set_header X-Forwarded-Host $host;
        
        proxy_set_header Origin http://127.0.0.1:3000;
    }
}