LinuxQuestions.org - multiple nginx reverse proxy possible ?

domain = example.com

server 1 ip = 1

server 2 ip = 2

server 3 ip = 3

server 1 = where website files are located

server 2 run nginx reverse proxy and point to server 1

example.com point to server 2

is it possible to make server 3 with reverse proxy also to point to server 1 ?
some kind of load balancing

this is the config in server 2

Code:

  server {

 listen 80;

 server_name server2;

 error_log off;

 proxy_pass http://1/; server 1 ip 

 proxy_set_header Host      $host;

 proxy_set_header X-Real-IP $remote_addr;

  access_log  off;

log_not_found  off;

 } }