IPP Mail Archive: Re: IPP> Identifying jobs in requests

IPP Mail Archive: Re: IPP> Identifying jobs in requests

Re: IPP> Identifying jobs in requests

Carl Kugler (kugler@us.ibm.com)
3 Jun 1998 18:14:43 -0000

JK Martin wrote:
> Carl Kugler wrote:
>
> > At one time, people were proposing some kind of dispatching or routing IPP
> > Object that would receive IPP requests and route them based on the embedded
> > "printer-uri".
>
> I was one of those people suggesting demultiplexing/dispatching,
> but only within an HTTP server environment. As such, the server-
> side component (CGI script, servlet, etc) would use the HTTP
> header component to discriminate the real target.
>
If I understand what you're saying, this works fine today, with the existing model. For example, in our implemenation, these two Request-URIs sent to Host carlk:

/servlet/IPPServlet/vega-lp
/servlet/IPPServlet/pp4019

both cause the web server on carlk to invoke servlet IPPServlet. IPPServlet uses the path info from the Request-URI to determine if the target output device is "vega-lp" or "pp4019".

>
> > But the final decision was that the HTTP Request-URI and the embedded
> > "printer-uri" MUST be the SAME. Therefore the IPP Object that receives
> > the request must be the target.
>
> Did we actually come to a final decision? I didn't read that we had.
> (Maybe I'm missing a message or two on this subject?)
>
In http://www.findmail.com/list/ipp/mg771994797.html, Robert Herriot wrote:

> Randy suggests that the value of job-uri/printer-uri could differ from the request-uri on the HTTP Request-Line, but the model has no such concept. So unless there are strong arguments to the contrary, the protocol document will state that the request-uri has the same value as the printer-uri/job-uri in the operation.

Then Randy agreed, and the thread ended.

>
>
> > There could be a problem if a proxy rewrites the Request-URI in any way.
>
> Yeah, this worries me, too. We definitely need some serious
> implementation experience to better understand the ramifications
> of this situation.
>
> ...jay
>
> ----------------------------------------------------------------------
> -- JK Martin | Email: jkm@underscore.com --
> -- Underscore, Inc. | Voice: (603) 889-7000 --
> -- 41C Sagamore Park Road | Fax: (603) 889-2699 --
> -- Hudson, NH 03051-4915 | Web: http://www.underscore.com --
> ----------------------------------------------------------------------
>
>