How to add an arg to the requests to the upstreams

[speedfirst]

Hey, I wanna add a custom arg to the upstreams by proxy_pass like this:

upstream servers {
    server1:8011;
    server2:8012;
 }

...
server {
  listen on 8443;
  ssl on;
  server_name server0;
  location / {
     proxy_pass https://servers; 
  }
}


My expectation: type "https://server0:8443" and the upstream will get
"https://server1:8011?abc=1"

So how can I make this? Thanks.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,200661,200661#msg-200661