nginx 1.2.7 on CentOS 6.3. Reverse-proxy with two upstream servers. One server should be default, the other should only be used when called from a link on a specific web server.

I have the reverse proxy working fine for the default upstream, but not quite right on the second, site-specific upstream. Ignoring that I am also rewriting for http to force https (yeah, I know, it's discouraged to go encrypted between the nginx proxy and its upstreams, but it's a corporate security thing) I am using a two server block configuration, one server name for the default and another for the site-specific server. The site-specific server will link to the default server URL but should rewrite to the site-specific upstream's proxy's URL.

It seems to work - not sure if it gets stuck in the proxy or on the upstream for the site-specific setup -, but it was suggested that a single server, selecting between upstream servers, would be preferable. I would like to know how that would be configured - just a quick overview or link to a documentation page would help a lot.

If I can throw together a quick test of a single-server-block reverse-proxy config with multiple upstreams which are selected based on calling server, I could test to see if it's my multi-server-block setup or a problem on the upstream.

Thanks!

Jim.