Apache is set up in OS X by default to provide something-not much, mind you, but something. The "Seeing this instead of the website you expected?" page is just the default "successful installation" page for Apache. But when I go to
http://localhost, I don't get redirected. I think if you do get redirected that you should look at your hosts file (but I can't remember where that is at the moment...). The hosts file can redirect ANYTHING.