Since then he gets regular questions and requests for help on proxying with Apache.
You may want to add it if you are concerned about the load on your network or origin servers, but the details are outside the scope of this article.
I'm also going to ignore all non-HTTP protocols, and load balancing.
This distinction is particularly important in a proxy, because one of the most significant changes between the two protocol versions is that HTTP/1.1 introduces rich new cache control mechanisms.
Apache 2.2 brings major improvements over Apache 2.0 in both proxying and cacheing, and is also the first version to support load-balancing as standard.