Proper way to get uri of backend server

Server NGINX
1

Hi everybody,

I want return a page with simply the uri of backend server. For
example, I have two servers (one.mydomain.com, two.mydomain.com) and
when a client ask to /geturi/?TEST=hello, I want to hash ‘hello’ for
retrieving a server hostname.

This is my solution :

on loadbalancer

upstream backend_ap {
server one.mydomain.com;
server two.mydomain.com;
hash $arg_TEST;
}

location /geturi {
default_type text/html;
proxy_pass http://backend_ap;
}

on backend server

location / {
root html;
index /index.html;

   allow   X.X.0.0/16;
   deny    all;

}

cat /usr/local/nginx/html/index.html

one.mydomain.com

Do you have a faster way ?

Thanks in advance

Vincent Chavelle