Pre-requisites - Understanding your environment
The Opmantke Opmantek VM Appliance is CentOS 6 and ships with Apache v2.2
There are lots of useful things you can do with proxying and Apache. For example pushing URLs from HTTP to HTTPS, doing SSL offload, having different URLs for different customers, having the same server name for lots of your services hosted on different internal servers etc. To properly understand all the details refer to:
For Apache 2.4
Apache 2.2 simply has simply this example http://httpd.apache.org/docs/2.2/vhosts/examples.html#Using Virtual_host and mod_proxy together
Of course your company may also have sophisticated proxying and load balanncing appliances already in place, in which case do use those.
Where are all my Apache configuration files?