IPP Mail Archive: Re: IPP> Supported URIs for print-by-reference

Re: IPP> Supported URIs for print-by-reference

Carl-Uno Manros (cmanros@cp10.es.xerox.com)
Thu, 25 Sep 1997 09:55:29 PDT

At 09:11 AM 9/25/97 PDT, Larry Masinter wrote:
>I think that putting that IPP servers MUST support "ftp:" is a mistake,
>since the "ftp:" URL scheme will probably not progress along standards
>track without some serious reengineering, and it isn't clear what it
>is that you're expecting the printers to be conformant with. MUST they
>also support the ";type=" option in FTP URLs, since that's a Proposed
>Standard? MUST they also support ftp://user:@host/ forms?
>
>Right now, the choice of binary or ascii transfer methods in FTP is
>heuristic.

This might be a reason to drop ftp from our mandatory list, but in any case
we cannot always guarantee that a print-by-reference URI will actually work.

>Frankly, you'd be better off requiring support for URIs of type "https",
>and also in specifying other attributes of what a printer might do when
>retrieving data via http on behalf of another user, e.g., supplying
>credentials, the user-agent string, cookies, etc.

Sorry, but we have already discovered that we cannot do print-by-reference
with any of the existing security mechanisms, so forget "https". We have
enough problems with wanting to reference security work that is not yet on
the standards track.

>
>Larry
>--
>http://www.parc.xerox.com/masinter
>
>
Carl-Uno Manros
Principal Engineer - Advanced Printing Standards - Xerox Corporation
701 S. Aviation Blvd., El Segundo, CA, M/S: ESAE-231
Phone +1-310-333 8273, Fax +1-310-333 5514
Email: manros@cp10.es.xerox.com