For Nginx webserver you can use the Module ngx_http_realip_module works especially well if you are behind Cloudflare or other reverse proxy.
So you either put your origin server ip in a custom conf file loaded by or in nginx conf or:
For a Cloudflare type setup
In a custom folder (include) by nginx we would put (after loading the module):
set_real_ip_from 103.21.244.0/22;
set_real_ip_from 103.22.200.0/22;
set_real_ip_from 103.31.4.0/22;
set_real_ip_from 104.16.0.0/12;
set_real_ip_from 108.162.192.0/18;
set_real_ip_from 131.0.72.0/22;
set_real_ip_from 141.101.64.0/18;
set_real_ip_from 162.158.0.0/15;
set_real_ip_from 172.64.0.0/13;
set_real_ip_from 173.245.48.0/20;
set_real_ip_from 188.114.96.0/20;
set_real_ip_from 190.93.240.0/20;
set_real_ip_from 197.234.240.0/22;
set_real_ip_from 198.41.128.0/17;
set_real_ip_from 199.27.128.0/21;
set_real_ip_from 127.0.0.1/32;
real_ip_header CF-Connecting-IP;
set_real_ip_from 2400:cb00::/32;
set_real_ip_from 2606:4700::/32;
set_real_ip_from 2803:f800::/32;
set_real_ip_from 2405:b500::/32;
set_real_ip_from 2405:8100::/32;
real_ip_header CF-Connecting-IP;
https://nginx.org/en/docs/http/ngx_http_realip_module.html
In conf file – include /etc/nginx.custom.d/*.conf;
If that helps.
stu