setting up client ip and hostname in nginx?

[ngineo]

i am working on AWS Elastic Beanstalk Instance, which runs Java applicaiton
servered through Nginx ( no load balancer in front, just a standalone
instance )
I need to set cookie to catch client ip and client hostname. Is this
possible to do it in nginx and if yes then how?
Below if my nginx configuration file:

location / {
proxy_pass          http://127.0.0.1:5000;
proxy_http_version  1.1;

proxy_set_header    Connection          $connection_upgrade;
proxy_set_header    Upgrade             $http_upgrade;
proxy_set_header    Host                $host;
proxy_set_header    X-Real-IP           $remote_addr;
proxy_set_header    X-Forwarded-For     $proxy_add_x_forwarded_for;
}

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,270675,270675#msg-270675