I have a main server with the following nginx config:

server {
    server_name my.website.shop www.my.website.shop;
    ignore_invalid_headers off;
    client_max_body_size 80M;
    client_body_temp_path /tmp;
    underscores_in_headers on;

location /mag {
       proxy_set_header X-Forwarded-For $remote_addr;
       proxy_set_header Host $http_host;
       proxy_set_header X-Real-IP $remote_addr;
       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
       proxy_pass http://my_another_ip$request_uri;
}

location / {
       proxy_set_header   X-Forwarded-For $remote_addr;
       proxy_set_header   Host $http_host;
       proxy_pass      http://localhost:3001;
       access_log      /var/log/nginx/access.log;
       access_log      /var/log/nginx/shopper-front.log;
}

location /Images {
      root /opt/app/my.website/backend/wwwroot/;
}

 location /nginx_status {
    stub_status on;
    access_log off;
    allow 127.0.0.1;
    deny all;
       }
       listen 80;
}

And in my_another_ip, I use this compose file: https://github.com/docker/awesome-compose/blob/master/wordpress-mysql/compose.yaml

When I run docker-compose up -d and try to access my.website.shop/mag, I expect to show me the WordPress installation page like my.website.shop/mag/wp-admin/install.php, but it redirects to my.website.shop/wp-admin/install.php and removes the /mag from the URL.

I’m not able to find where’s the issue and why it’s like this.

I can easily access the my_another_ip and I can access WordPress from that URL, but that’s not what I’m going to have.

Would you please help me where the issue is?