How to use Custom Nginx Configuration in Nginx Proxy Manager - Advanced Edit Proxy Host?
            
    
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    You can pass the ip address so your application can see visitor's ip address:
location / {
    proxy_pass $forward_scheme://$server:$port;
    # Forward the real IP address of the client
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header ...