proxy_protocol on short url visit remote_addr is 127.0.0.1?

[sosojustdo]

Shlink version

3.2.1

PHP version

8.1.10

How do you serve Shlink

Self-hosted nginx

Database engine

MySQL

Database version

5.7.32

Current behavior

I have used nginx proxy_protocol, please see nginx.conf

#   * Official English Documentation: http://nginx.org/en/docs/
#   * Official Russian Documentation: http://nginx.org/ru/docs/

user root;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;

# Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;

events {
    worker_connections 1024;
}

stream {
    map $ssl_preread_server_name $backend_name {
        www.xx1.top proxy_trojan;
        www.xx2.com web;
        www.xx3.com web;
        default web;
    }

    upstream trojan {
        server 127.0.0.1:10443;
    }

    upstream proxy_trojan {
        server 127.0.0.1:10444;
    }

    upstream web {
        server 127.0.0.1:1443;
    }

    server {
        listen 443 reuseport;
        listen [::]:443 reuseport;
        proxy_pass  $backend_name;
        proxy_protocol on;
        ssl_preread on;
    }

    server {
        listen 10444 proxy_protocol;
        proxy_pass  trojan;
    }
}

http {
    log_format  main  '$proxy_protocol_addr - $remote_addr - $remote_user [$time_local] "$request" - $http_host - $server_addr - $server_name '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    proxy_connect_timeout 300;
    proxy_send_timeout 300;
    proxy_read_timeout 300;
    proxy_buffer_size 16k;
    proxy_buffers 4 64k;
    proxy_busy_buffers_size 128k;
    proxy_temp_file_write_size 128k;
    types_hash_max_size 4096;

    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;

    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;
    server {
        listen       80;
        listen       [::]:80;
        server_name  _;
        root         /usr/share/nginx/html;

        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;

        if ($http_host = $server_addr) {
           return 403;  # 如果请求地址包含主机名，返回403响应
        }

        error_page 404 /404.html;
           location = /404.html {
        }

        error_page 500 502 503 504 /50x.html;
           location = /50x.html {
        }
    }

}```

www.xx2.com.conf
```server {
    server_name  www.xx2.com;

    if ($http_host = $server_addr) {
        return 403;  # 如果请求地址包含主机名，返回403响应
    }

    if ($request_uri ~* $host) {
        return 403;
    }

    location / {
        try_files $uri $uri/ /index.php$is_args$args;
        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-Host $host;
        proxy_set_header X-Forwarded-Proto $scheme;
    }

    location ~ \.php$ {
        root /opt/shlink/public;
        charset utf-8;
    fastcgi_split_path_info ^(.+\.php)(/.+)$;
    fastcgi_pass unix:/var/run/php-fpm.sock;
    fastcgi_index index.php;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    include fastcgi_params;
    include fastcgi.conf;
        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-Host $host;
        proxy_set_header X-Forwarded-Proto $scheme;
    }



    listen 1443 ssl proxy_protocol; # managed by Certbot
    #listen 1443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/www.xx2.com/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/www.xx2.com/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}

server {
    if ($http_host = $server_addr) {
        return 403;  # 如果请求地址包含主机名，返回403响应
    }

    if ($request_uri ~* $host) {
        return 403;
    }

    if ($host = www.xx2.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    server_name  www.xx2.com;
    listen 80;
    return 404; # managed by Certbot


}```

### Expected behavior

<img width="2022" alt="image" src="https://github.com/shlinkio/shlink/assets/3364336/809e1b31-825b-42e7-9776-397f3549ef7e">


### How to reproduce

<!-- Provide steps to reproduce the bug. -->

[sosojustdo]

I have resolved the problem
location ~ .php$ {} block add fastcgi_param, and set REMOTE_ADDR、HTTP_X_FORWARDED_FOR

fastcgi_param REMOTE_ADDR $proxy_protocol_addr;
fastcgi_param HTTP_X_FORWARDED_FOR $proxy_protocol_addr;