Redirect without changing URL

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http://serverfault.com – Here's the setup. We have a hardware load balancer with an http virtual cluster. Let's call this virtual cluster example1.com. This virtual cluster load balances between two squid reverse proxies which are also on the same physical servers as the web servers. Squid listens on 80 and points to itself as the cache_peer web server which listens on 81. We also have a standalone web server which we will call example2.com. What we are trying to do is create a subdirectory on example1.com called example1.com/example2. This will point to example2.com, but we want our users to stay at example1.com/exa (HowTos)