Please see section 14.23 ("Host") of draft-ietf-http-v11-spec-rev-03.txt
which lays out the requirements and conditions more clearly.
> 3. A full IPP URL (e.g., ipp://myhost.com/myprinter/myqueue)
>
> <RKD> I don't understand why this would be required. If it
> <RKD> is, then I think it breaks the proposal.
Please see section 5.1.2 ("Request-URI") of
draft-ietf-http-v11-spec-rev-03.txt.