NGINX Proxy with Geo module

nginx.conf

# https://serverfault.com/questions/545441/nginx-geo-location-module-configuration-using-geo-database
# http://nginx.org/en/docs/http/ngx_http_geo_module.html#directives
# https://www.howtoforge.com/nginx-how-to-block-visitors-by-country-with-the-geoip-module-debian-ubuntu
# https://dev.maxmind.com/geoip/legacy/geolite/

geoip_country /usr/share/GeoIP/GeoIP.dat;
map $geoip_country_code $backend {
    default US;
    US US;
    CN DE;
    DE DE;
    FR DE;
    EU DE;
}

upstream DE {
    server IP_DE; #Server A
}
upstream US {
    server IP_US; #Server B
}
	##
	# Virtual Host Configs
	##
server {
     listen 80;
     location / {
         proxy_pass http://$backend;
         proxy_set_header        Host            $host;
         proxy_set_header        X-Real-IP       $remote_addr;
         proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
     }
}