id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	uname	nginx_version
1025	No country detected for requests with X-Forwarded-For 127.0.0.1 or any reserved IP address	romamo@…		"I use ngx_http_geoip_module to detect origin country of every request including requests behind public proxy servers.

{{{
geoip_country /usr/local/etc/nginx/geobase/GeoIP-106_20160712.dat;
geoip_proxy_recursive on; # Use X-Forwarded-For
geoip_proxy 0.0.0.0/0;
}}}

if X-Forwarded-For header contains IP address from reserved range https://en.wikipedia.org/wiki/Reserved_IP_addresses

'''$geoip_country_code is empty """"'''

For example: X-Forwarded-For: 127.0.0.1

GeoIP database has empty values for these IP ranges.
GeoIP2 database has no values.

I think nginx_geoip module must query geoip database again using REMOTE_ADDR if no country value received using X-Forwarded-For value.

How to repeat
test.php
{{{
<?
var_dump($_SERVER['HTTP_X_FORWARDED_FOR']);
var_dump($_SERVER['GEOIP_COUNTRY']);
?>
}}}

{{{
curl --header ""X-Forwarded-For: 127.0.0.1"" http://localhost/test.php
}}}

Alternative solution may be put all valid IP ranges into geoip_proxy like
geoip_proxy 1.0.0.0/8;
geoip_proxy 2.0.0.0/7;
4.0.0.0/6
8.0.0.0/7
11.0.0.0/8
12.0.0.0/6
16.0.0.0/4
32.0.0.0/3
64.0.0.0/3
96.0.0.0/6
100.0.0.0/10
100.128.0.0/9
101.0.0.0/8
102.0.0.0/7
104.0.0.0/5
112.0.0.0/5
120.0.0.0/6
124.0.0.0/7
126.0.0.0/8
128.0.0.0/1
but it may lower performance."	enhancement	new	minor		nginx-module	1.10.x		ngx_http_geoip_module, geoip		FreeBSD test 9.3-RELEASE FreeBSD 9.3-RELEASE #0: Tue Nov  3 13:52:37 UTC 2015    /usr/obj/usr/src/sys/EX4RVM91  amd64	"nginx version: nginx/1.10.1
configure arguments: --prefix=/usr/local/etc/nginx --with-cc-opt='-I /usr/local/include' --with-ld-opt='-L /usr/local/lib' --conf-path=/usr/local/etc/nginx/nginx.conf --sbin-path=/usr/local/sbin/nginx --pid-path=/var/run/nginx.pid --error-log-path=/var/log/nginx-error.log --user=www --group=www --modules-path=/usr/local/libexec/nginx --with-file-aio --http-client-body-temp-path=/var/tmp/nginx/client_body_temp --http-fastcgi-temp-path=/var/tmp/nginx/fastcgi_temp --http-proxy-temp-path=/var/tmp/nginx/proxy_temp --http-scgi-temp-path=/var/tmp/nginx/scgi_temp --http-uwsgi-temp-path=/var/tmp/nginx/uwsgi_temp --http-log-path=/var/log/nginx-access.log --with-http_geoip_module=dynamic --with-http_gzip_static_module --with-http_image_filter_module=dynamic --add-module=/usr/ports/www/nginx/work/ngx_http_substitutions_filter_module-0.6.4 --with-http_stub_status_module --with-pcre"