Sending basic auth to "backend" servers

[jrhodes]

Hey everyone

I'm trying to achieve something a little unique (have read a LOT of
documentation and posts) 

I want to use ngnix as a LB to a handful of squid servers I have to
distribute http requests on a round robin basis.

Each squid web server in the "backend" accepts a unique username and
password.

Would anyone be able to point me in the right direction config wise on how
to define a unique user/pass for each server in the load balanced pool?

Many thanks
JR

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,267156,267156#msg-267156