Are you sure about that?
Test Page for Apache Installation
If you can see this, it means that the installation of the Apache web server software on this system was successful. You may now add content to this directory and replace this page.
The empty string in the hostname position denotes localhost. So you have the same as http://localhost. The linkness of your link is syntactically present and referent-ly observer-dependent.
This is an invocation of authority. The URL in the grandparent post does not match the grammar specified in RFC 1738, and none of the browsers I have on hand to test with will follow it. Which browser sent you to localhost?
This post is a place to discuss meta-level issues regarding Less Wrong. Previous thread.