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I edited the answer so it says example.com now.

I'm surprised http://example.com is reserved by IANA.

It's reserved per RFC 2606: http://tools.ietf.org/html/rfc2606

...why is that surprising?

Because it makes sense. These sorts of things normal are allowed to go through so that horrible unintended consequences can be wrought on the unsuspecting.

Unless, you know, you want to be in the #1 spot on a Google search.