Nginx Remote IP

remote_ip.conf

map $http_user_agent $mode {
        default 'plain';
        ~*(Mozilla) 'html';
}
map $http_user_agent $html {
        default '';
        ~*(Mozilla) '<title>$remote_addr</title>';
}

server {
        listen 80;
        server_name     example.com;
        location = /ip {
                more_set_headers 'Content-Type: text/$mode';
                echo -n $html;
                echo -n $remote_addr;
        }
}