There's a long tradition in IETF of reusing and/or adapting existing
technology, so there's no problem with that per se. But there are
several problems with overloading a new protocol on top of existing
web *services*. And the idea that IPP should be able to tunnel
through firewalls "by default" - thus overriding local site policy -
does great harm to the overall Internet architecture.
> >HTTP is an application by itself. TCP/IP is not.
> >IPP is trying to layer one application on top of another.
> True. However, layering one application on another has been the experience
> in OSI and other layered architectures.
And one of the things we learned from OSI is that if you have too many
layers - especially layers that don't fit well together - the result
isn't very effective. Otherwise known as the 'leaning tower' effect.