Hacker News Reader

It only works for me (OS X, Safari) when written as http://uz./ (a proper FQDN)

That isn't a zero character name. It's just the TLD itself acting as a website. It's a 1 label domain rather than the usual 2-3 labels.

Well, I suppose the root counts as a zero-character domain.

The trailing . makes it fully-qualified.

It does not resolve here.

Interesting side-effect, windows doesn't support TLD-only addresses.

.monash used to also have the same property (if I am not mistaken), until they realized this fact, I imagine.