access nginx for testing while in maintenance

[Yaxm Yaxm]

I have this setup: nginx => haproxy => thin( a ruby http server )
when in maintenance mode(serving a maintenance page to end users), how
can I still access the web server so that I can do some testing first?

I want to be able to access the server via the same domain.

maybe set some magic cookie? or pass through requests from a particular
IP?  Any idea?
-- 
Posted via http://www.ruby-forum.com/.