Qustion for reverse-proxy for virtual host

[quan nexthop]

Hi all:

I try to setup the NGINX as a reverse-proxy to protect several webservers,
which lots of websites are running on. Yes, it is a virtual host :)

abc.com |-----------[nginx reverse proxy] ------- |virtualhost] ----/abc
directory
123.com|
|--/123  directory

[note] the virtualhost port is 80.

I go through the wiki.nginx.net and can not find any configuration related
with the topology.

Any one can paste a configuration for such case?
how can I distinguish the different server in one listening port?

thanks
George
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