id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	uname	nginx_version
774	modern_browser // gecko version overwrites msie version	openid.stackexchange.com/user/e58ad7e4-c803-4f2f-899a-9effcfb76f61		"I am not sure, if this behavior is still the case in the current version, but it occurs in 1.4 on ubuntu 14.04.

giving the following config:

##########################################
    modern_browser gecko     27.0;
    modern_browser opera     19.0;
    modern_browser safari    8.0;
    modern_browser msie      9.0;
    modern_browser unlisted;

    ancient_browser Links Lynx netscape4;
##########################################

on an IE11 (Win 8) $ancient_browser == 1. I am not sure if its only me, but this seems wrong in my understanding of how the module should work.
This applies for a 'real' IE11, but does not for a spoofed UA (in chromium 46.0.2462.0) of IE10, IE9, IE8, IE7 - so in that case everything works as expected.
Interestingly though the next config:

##########################################
    modern_browser gecko     9.0;
    modern_browser opera     19.0;
    modern_browser safari    8.0;
    modern_browser msie      9.0;
    modern_browser unlisted;

    ancient_browser Links Lynx netscape4;
##########################################

works as expected (in terms of the IE behavior), meaning $ancient_browser != 1. But now I would support older firefox versions - and that is not intended.
The following config also gets $ancient_browser to be != 1

##########################################
    modern_browser gecko     9.0;
    modern_browser opera     19.0;
    modern_browser safari    8.0;
    modern_browser msie      12.0;
    modern_browser unlisted;

    ancient_browser Links Lynx netscape4;
##########################################


_Conclusion_: it looks like the gecko version is overwriting the defined msie version. This does not mean, that its exactly what is happening internally."	defect	accepted	minor		nginx-module	1.4.x		moder_browser gecko msie version		Linux [HOSTNAME] 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux	"nginx version: nginx/1.4.6 (Ubuntu)
built by gcc 4.8.2 (Ubuntu 4.8.2-19ubuntu1) 
TLS SNI support enabled
configure arguments: --with-cc-opt='-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-Bsymbolic-functions -Wl,-z,relro' --prefix=/usr/share/nginx --conf-path=/etc/nginx/nginx.conf --http-log-path=/var/log/nginx/access.log --error-log-path=/var/log/nginx/error.log --lock-path=/var/lock/nginx.lock --pid-path=/run/nginx.pid --http-client-body-temp-path=/var/lib/nginx/body --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --http-proxy-temp-path=/var/lib/nginx/proxy --http-scgi-temp-path=/var/lib/nginx/scgi --http-uwsgi-temp-path=/var/lib/nginx/uwsgi --with-debug --with-pcre-jit --with-ipv6 --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-http_addition_module --with-http_dav_module --with-http_geoip_module --with-http_gzip_static_module --with-http_image_filter_module --with-http_spdy_module --with-http_sub_module --with-http_xslt_module --with-mail --with-mail_ssl_module"