咨询：保持URL不变将子应用作为独立主应用部署的可行性

Absolutely, this is totally doable—there are several solid approaches to make your internal sub-app run as a standalone service while keeping the original URL www.Examples.com/internal, whether you host both apps on the same server or separate ones. Here are the most practical solutions:

This is the most straightforward and widely used method, working seamlessly for both single-server and multi-server setups. You’ll use a reverse proxy tool like Nginx or Apache to route requests:

• Requests to www.Examples.com/ go to your main application
• Requests to www.Examples.com/internal (and all subpaths under it) get forwarded to your standalone internal app

Nginx Configuration Example #

server {
    listen 80;
    server_name www.Examples.com;

    # Route main app traffic
    location / {
        proxy_pass http://localhost:3000; # Replace with main app's address (local port or remote IP:port)
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }

    # Route internal sub-app traffic
    location /internal {
        proxy_pass http://localhost:4000; # Replace with standalone internal app's address
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        # Rewrite the path to strip /internal prefix (if your internal app expects root path requests)
        rewrite ^/internal(.*)$ $1 break;
    }
}

Apache Configuration Example #

If you prefer Apache, enable mod_proxy and mod_rewrite first, then use this virtual host config:

<VirtualHost *:80>
    ServerName www.Examples.com

    # Route main app traffic
    ProxyPass / !
    ProxyPass / http://localhost:3000/
    ProxyPassReverse / http://localhost:3000/

    # Route internal sub-app traffic
    ProxyPass /internal http://localhost:4000/
    ProxyPassReverse /internal http://localhost:4000/
    RewriteEngine On
    RewriteRule ^/internal(.*)$ $1 [PT]
</VirtualHost>

If you’re running apps on separate servers and anticipate scaling to more services later, an API Gateway like Traefik, Kong, or Spring Cloud Gateway (for Java-based stacks) is a great choice. The gateway acts as a single entry point for all traffic, routing requests to the appropriate service based on the URL path.

For example, with Traefik, you can define routing rules via configuration files or service labels (if using container orchestration like Docker Swarm/Kubernetes) to send all www.Examples.com/internal traffic to your standalone internal service.

If your main application is still active and you want to handle routing within it, you can add server-side logic to forward /internal requests to the standalone sub-app. However, this approach is less flexible than a reverse proxy: if the main app goes down, the sub-app becomes unreachable, and you’ll have to maintain forwarding logic in the main app code.

Key Notes to Keep in Mind #

• CORS Settings: Ensure your standalone internal app has proper CORS configuration to allow requests from www.Examples.com (if it makes frontend API calls).
• Path Matching: Test edge cases like www.Examples.com/internal vs www.Examples.com/internal/ to avoid broken routes.
• HTTPS: If using SSL, configure the proxy/gateway to handle SSL termination, then forward traffic to your apps (either via HTTPS or HTTP, depending on your security needs).

内容的提问来源于stack exchange，提问作者Mathan Kumar