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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