Can I reverse proxy requests for data-host-url ?

[miniwater]

I have hidden it through nginx reverse proxy https://cloud.umami.is/script.js link.

I want to continue https://api-gateway.umami.dev/api/send Also hide and become /api/send.

I tried to reverse proxy data-host-url in nginx

location = /api/send {
    proxy_pass https://cloud.umami.is/api/send; 
    proxy_set_header Host cloud.umami.is; 
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header REMOTE-HOST $remote_addr; 
    proxy_set_header Upgrade $http_upgrade; 
    proxy_set_header Connection $http_connection; 
    proxy_set_header X-Forwarded-Proto $scheme; 
    proxy_set_header X-Forwarded-Port $server_port; 
    proxy_http_version 1.1; 
    add_header X-Cache $upstream_cache_status; 
    add_header Cache-Control no-cache; 
    proxy_ssl_server_name on; 
    proxy_ssl_name cloud.umami.is; 
    add_header Strict-Transport-Security "max-age=31536000"; 
    add_header Alt-Svc 'h3=":443"; ma=2592000'; 
}

but the countries are not correctly detected on cloud version,

Is there any tutorial on proxy data-host-url for the third-party domain api-gateway.umami.dev, which is easily blocked by advertising plugins

[mikecao]

Make sure you are forwarding the IP address correctly.

[miniwater]

How should I forward correctly. Which header does cloud.umami.is obtain the client IP from. Is it X-Forwarded-For? I'm confused.