But yes, the network stack itself is a different question, then again,
you can just route a /64 into the loopback device and let your apache
listen there... (which also allows you to do easy-failover as you can
move that complete /64 to a different box ;)
You are still comparing an application level decision to a stack level
decision. Thousands of addresses on a stack could definitely pose an
issue depending on the OS.