Attempt to Access Dify via Nginx Reverse Proxy Fails

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1. Is this request related to a challenge you're experiencing? Tell me about your story.

I've successfully deployed Dify on a virtual machine within the intranet at 192.168.1.37 and can access it normally through port 80. However, I now need to provide external access via port 81 on this machine. Since other applications also share port 81, I've configured a reverse proxy (192.168.1.37:81/th-dify) for user access to Dify.
I found an solution(#7457) that suggests modifying the Nginx configuration and the .env file, which I've done as follows:


When accessing the webpage at http://192.168.1.37:81/th-dify, it automatically redirects to http://192.168.1.37:81/apps, and I see a 404 error in the browser's F12 debugging tools. Here's a screenshot:

Direct access to http://192.168.1.37/th-dify also results in a 404 error:

Accessing http://192.168.1.37/ redirects to http://192.168.1.37:81/apps, and the F12 debugging tools show a 404 error for the backend request address:

Is there any configuration I might have missed? Could you please assist me in resolving this issue? I would greatly appreciate your help.

2. Additional context or comments

No response