Nginx accept set-cookie but hide it from the client?

[nano]

Thank you again for the reply Jonathan, 

I'm sorry. This is not my application I am just trying to "mirror" it.

Without losing hope for caching, is there a way I can cache the pages and
only show the data to logged in clients?

What would I have to do to make sure the user is logged in on the site
before showing them a cached result?

Does commenting out 

proxy_ignore_headers Set-Cookie;

See if the client is logged in?

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,238867,238873#msg-238873