[Printing-architecture] IPP Validate-Job operation and its implementation in CUPS

Michael Sweet msweet at msweet.org
Thu Oct 22 21:56:31 UTC 2020


Alexander,

> On Oct 22, 2020, at 5:39 PM, Alexander Pevzner <pzz at apevzner.com> wrote:
> 
> Michael.
> 
> On 10/22/20 11:33 PM, Michael Sweet wrote:
>> Validate-Job is a necessary step in some managed/paid printing configurations - you'll get back a per-job authorization code that need to be used with Print-Job.
>> It is also a recommended step in both IPP Implementor's Guides...
> 
> Thank you for the explanation. And yet another question, what will CUPS do, if printer doesn't understand Expect: 100-continue header?

CUPS times out the expectation after 1 second, continuing the print job (and assuming there won't be an authentication challenge).  Fortunately, most printers support Expect, but if they don't there isn't a large penalty.

________________________
Michael Sweet





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