Is it possible to populate $geoip_country from another value in the header?

[rainer at ultra-secure.de]

Hi,

we may have a situation where NGINX is behind a load-balancer that cloaks
all source-IPs with its own.
However, the original source-IP is conserved in a header.
Would it be possible to populate the geoip_country variable from that
other variable?



Best Regards,
Rainer