IPP Mail Archive: RE: IPP> I-D ACTION:draft-ietf-ipp-url-sch

IPP Mail Archive: RE: IPP> I-D ACTION:draft-ietf-ipp-url-sch

RE: IPP> I-D ACTION:draft-ietf-ipp-url-scheme-00.txt

From: McDonald, Ira (imcdonald@sharplabs.com)
Date: Tue Jan 23 2001 - 21:52:24 EST

  • Next message: Carl-Uno Manros: "RE: IPP> I-D ACTION:draft-ietf-ipp-url-scheme-00.txt"

    Hi Carl,

    I agree that something should be added to the (next,
    not current) version of the IPP Implementors Guide.

    I also agree that it's perfectly possible to contact
    in IPP implementation using IPP/1.0 version and an
    'ipp:' URL (although RFC 2565/2566 are entirely silent
    on this topic, except for the IESG nasty-gram on the
    cover sheets).

    Let's beat this issue up on the mailing list. If we
    can get some good concensus, then I'd be delighted to
    treat the issue right in the I-D (future standards track
    RFC) that registers the 'ipp:' URL scheme. According
    to the IETF, this kind of protocol version issue SHOULD
    be addressed right in the same RFC.

    Cheers,
    - Ira McDonald, consulting architect at Sharp and Xerox
      High North Inc

    -----Original Message-----
    From: Carl Kugler [mailto:kugler@us.ibm.com]
    Sent: Monday, January 22, 2001 4:30 PM
    To: McDonald, Ira
    Cc: ipp@pwg.org
    Subject: RE: IPP> I-D ACTION:draft-ietf-ipp-url-scheme-00.txt

    Well, then, maybe it should go into the Implementer's Guide or something.
    A lot of these rules for backward compatibility would be non-intuitive to
    me, for one. I've always thought that these backward compatibility rules
    are the hardest part of supporting the "ipp:" scheme.

         -Carl

    "McDonald, Ira" <imcdonald@sharplabs.com> on 01/22/2001 04:49:35 PM

    To: Carl Kugler/Boulder/IBM@IBMUS, ipp@pwg.org
    cc:
    Subject: RE: IPP> I-D ACTION:draft-ietf-ipp-url-scheme-00.txt

    Hi Carl,

    I was directed to REMOVE discussion of backward
    compatibility with IPP/1.0, because the IETF docs
    (RFC 2565/2566) for IPP/1.0 do not specify the
    use of the 'ipp:' URL scheme (although many
    implementations of IPP/1.0 correctly accept and
    process 'ipp:' URL schemes in clients and servers).

    Cheers,
    - Ira McDonald, co-editor of 'ipp:' URL scheme I-D
      High North Inc

    -----Original Message-----
    From: Carl Kugler [mailto:kugler@us.ibm.com]
    Sent: Wednesday, January 17, 2001 10:11 AM
    To: ipp@pwg.org
    Subject: RE: IPP> I-D ACTION:draft-ietf-ipp-url-scheme-00.txt

    What ever happened to the section about backward compatibility with
    IPP/1.0? It used to be in

         ftp://ftp.pwg.org/pub/pwg/ipp/new_PRO/ipp-scheme-981116.doc

         -Carl

    1 Compatibility with IPP/1.0
    For compatibility with IPP/1.0, clients and IPP objects (i.e. a server)
    MUST support additional schemes as described in this section:

    If a server receives an IPP/1.0 request, it MUST return an IPP/1.0
    response. That is, it MUST support an http-URL in the target "printer-uri"
    and "job-uri" operation attributes in a request. If the server returns any
    of the 3 attributes, "job-uri", "job-printer-uri" or
    "printer-uri-supported" in the response, the value of these attributes MUST
    be http-URLs. For security, a server MAY also support https-URLs.
    When a server returns the printer attribute "printer-uri-supported",
    it MUST return all supported values for an IPP/NV request. For an IPP/1.0
    request, a server MUST NOT return values that are ipp-URLs, i.e. it MUST
    return only the http-URLs and https-URLs.
    The table below shows the type of URL that a server returns for the
    "job-uri" and "job-printer-uri" job attributes for all operations based on
    how the job was created. The "or" in the table below indicates an
    implementation option.
           |-----------+------------------------------------|
           | Operation | Job created via |
           | attributes| |
           | for a | |
           | request | |
           |-----------+------------------------------------|
           | | ipphttphttps |
           |-----------+------------------------------------|
           | ipp | ippippNo URL returned |
           |-----------+------------------------------------|
           |http | httphttpNo URL returned |
           |-----------+------------------------------------|
           |https | https or httphttps or httphttps |
           |-----------+------------------------------------|

             If a server registers an ipp-URL with a name service, then it
            MUST also register an http-URL. If a printer supports a secure
            connection using SSL3, then it MUST register an https-URL.
             An IPP/NV client MUST use an ipp-URL for non-secure printers
            unless it receives a "version not supported" error message. Then it
            MUST try to send a request in version 1.0, using the http-URL in
            place of the ipp-URL for the target "job-uri" and "printer-uri"
            operation attributes in the request. For secure printers, an IPP/NV
            client must operate as an IPP/1.0 client and use an https-URL. An
            IPP/1.0 client MUST use an http-URL for non-secure printers and an
            https-URL for secure printers.

    --- In ipp@egroups.com, "Hastings, Tom N" <hastings@c...> wrote:
    I've made a .pdf file with line numbers from the .txt I-D and posted
    both of
    them at:

    ftp://ftp.pwg.org/pub/pwg/ipp/new_URL/draft-ietf-ipp-url-scheme-00.pdf
    ftp://ftp.pwg.org/pub/pwg/ipp/new_URL/draft-ietf-ipp-url-scheme-00.txt

    As usual, send any comments to the DL. This will also be on the
    agenda for
    next week's IPP WG meeting and maybe today's telecon, if callers want
    to
    discuss.

    Tom

    -----Original Message-----
    From: Internet-Drafts@i... [mailto:Internet-Drafts@i...]
    Sent: Monday, January 15, 2001 03:45
    Cc: ipp@p...
    Subject: IPP> I-D ACTION:draft-ietf-ipp-url-scheme-00.txt

    A New Internet-Draft is available from the on-line Internet-Drafts
    directories.
    This draft is a work item of the Internet Printing Protocol Working
    Group of
    the IETF.

         Title : Internet Printing Protocol (IPP): IPP URL
    Scheme
         Author(s) : R. Herriot, I. McDonald
         Filename : draft-ietf-ipp-url-scheme-00.txt
         Pages : 15
         Date : 12-Jan-01

    This document is a product of the Internet Printing Protocol Working
    Group of the Internet Engineering Task Force (IETF). Comments should
    be submitted to the ipp@p... mailing list.

    A URL for this Internet-Draft is:
    http://www.ietf.org/internet-drafts/draft-ietf-ipp-url-scheme-00.txt

    Internet-Drafts are also available by anonymous FTP. Login with the
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