How to get client IP and Port when client send request to my web service via reverse_proxy?

[pistolbz (Lyoko)]

1. Output of caddy version:

v2.6.1 h1:EDqo59TyYWhXQnfde93Mmv4FJfYe00dO60zMiEt+pzo=

2. How I run Caddy:

I run caddy in Oracle VPS Ubuntu with workflow:

Install - Caddy Documentation

a. System environment:

Ubuntu 22.04.1 LTS

b. Command:

sudo systemctl daemon-reload
sudo systemctl restart caddy

d. My complete Caddy config:

My Caddyfile:

example.com {
        reverse_proxy http://127.0.0.1:8080 {
                header_up Remote-Addr {remote_ip}    # I tried changing these 2 lines 
                header_up Remote-Port {remote_port}  # but the result is still not as expected
        }
}

3. The problem I’m having:

I run a Django web service (using ASGI) on port 8080 using a reverse_proxy Caddy so it can be accessed from the internet by users.
And I want to know the Remote IP and Remote Port of the incoming user, I was able to get the Client IP from HTTP_X_FORWARDED_FOR but Port is not.

4. Error messages and/or full log output:

Resut of netstat -an -p tcp command

tcp        0      0 127.0.0.1:55052         127.0.0.1:8080          ESTABLISHED 336828/caddy        
tcp        0      0 127.0.0.1:8080          127.0.0.1:55052         ESTABLISHED 341505/python       
tcp6       0      0 :::80                   :::*                    LISTEN      336828/caddy        
tcp6       0      0 :::443                  :::*                    LISTEN      336828/caddy        
tcp6       0      0 10.0.0.10:443           113.153.143.14:1373     ESTABLISHED 336828/caddy

The results I get from Django command:

HTTP GET / 302 [0.01, 127.0.0.1:55052]

However, I want something like 113.153.143.14:1373 corresponding to Remote IP : Remote Port

5. What I already tried:

I tried searching the related Django ASGI and Caddy docs to determine if the problem was with Django or Caddy. However, I think it was caused by my program receiving IP:Port which changed after Caddy reverse_proxy from Outsite Address to Internal Address on local network.
Is that correct? and how should I configure Caddy or Django so that I can get the Client Port and display it in Django.

6. Links to relevant resources:

Same problem as this but Real IP not working with Caddy >=2.5, is there any other fix or do I have to reinstall Caddy < 2.5 to use this plugin?

Help with Caddy forwarding real ip

Please use three backticks ``` on their own lines, before and after your configs and logs to use code formatting. It’s difficult to read your post because of the messy formatting. Do not use these lines. Caddy automatically sets the appropriate headers. You’ll need to use the realip plugin, which replaces the RemoteAddr field in the request as early as possible with the value from the X-Forwarded-For header.

[francislavoie]

Caddy passes through the original client IP via the X-Forwarded-For header. See the docs:

reverse_proxy (Caddyfile directive) - Caddy Documentation

Why do you need the port? The connecting port will always be random, determined by your machine’s networking stack. It’s almost always irrelevant.