Reverse proxy for multiple websites

[Nguyen Hai Nam]

Hi,

I'm sticking on configure a reverse proxy, my scenario looks like:

Internet
.......|
.......|__Reverse proxy (listen port 80)
......................|__web1.com (listen port 8080)
......................|__web2.net (listen port 8080)
......................|__web-n.org (listen port 8080)

Assume All website shared one public IP only and each website runs on
independent VPS.

If I create multi server{} block to use proxy_pass directive to web
server inside, it's only web1.com can be reachable (perhaps it's on
top config).

It's highly appreciate if someone advice me ideas to make this working.

Thanks,

-- 
Best regards,
Hai Nam, Nguyen