Can not be browsing safety internet using Windows XP.

nginx.conf

server {
	set $browse_os "";
	if ($uri !~ ^/support_for_windows_xp_has_ended){
		set $browse_os "X";
	}
	if ($http_user_agent ~ "Windows NT 5\.[12]") {
		set $browse_os "${browse_os}P";
	}
	if ($browse_os = "XP"){
		return 302 /support_for_windows_xp_has_ended;
	}
	location /support_for_windows_xp_has_ended {
	 	default_type text/plain;
	 	echo "Why are you still using Windows XP ?";
	}
}