[cups] "Bad" request ?

The CUPS response, "client-error-bad-request", unfortunately doesn't
provide any clue as to *what* is wrong with a request. Here's an example
as decoded by wireshark.

The request.

  Internet Printing Protocol
  [Response In: 32]
  version: 2.0
  operation-id: Validate-Job (0x0004)
  request-id: 2
  operation-attributes-tag
       attributes-charset (charset): 'utf-8'
              name: attributes-charset
              charset value: 'utf-8'
       attributes-natural-language (naturalLanguage): 'en'
              name: attributes-natural-language
              naturalLanguage value: 'en'
       printer-uri (uri): 'ipp://pfa.local:631/ipp/'
              name: printer-uri
              uri value: 'ipp://pfa.local:631/ipp/'
       requesting-user-name (nameWithoutLanguage): 'dave'
              name: requesting-user-name
              nameWithoutLanguage value: 'dave'
       job-name (nameWithoutLanguage): 'testpage.pdf'
              name: job-name
              nameWithoutLanguage value: 'testpage.pdf'
       document-format (mimeMediaType): 'application/pdf'
              name: document-format
              mimeMediaType value: 'application/pdf'
  job-attributes-tag
       document-name-supplied (nameWithoutLanguage): 'testpage.pdf'
              name: document-name-supplied
              nameWithoutLanguage value: 'testpage.pdf'
       finishings (enum): none
              name: finishings
              finishings: none (3)
       job-originating-host-name (nameWithoutLanguage): 'localhost'
              name: job-originating-host-name
              nameWithoutLanguage value: 'localhost'
       job-uuid (uri): 'urn:uuid:a506d125-fe82-33ce-7b4b-d4feb3ebf216'
              name: job-uuid
              uri value: 'urn:uuid:a506d125-fe82-33ce-7b4b-d4feb3ebf216'
       number-up (integer): 1
              name: number-up
              integer value: 1
  end-of-attributes-tag

The response:

  Internet Printing Protocol
  [Request In: 15]
  [Response Time: 0.066818000 seconds]
  version: 2.0
  status-code: Client Error (client-error-bad-request)
  request-id: 2
  operation-attributes-tag
       attributes-charset (charset): 'utf-8'
              name: attributes-charset
              charset value: 'utf-8'
       attributes-natural-language (naturalLanguage): 'en'
              name: attributes-natural-language
              naturalLanguage value: 'en'
  end-of-attributes-tag

Someone please help me to understand where I can look to see what is
causing this error. The target printer is an HP M406, if that helps.
And, of course, if you can see the problem, can you tell me how to
fix it?
-- 
Dave Close, Compata, Irvine CA      "Genius may have its limitations,
[email protected], +1 714 434 7359    but stupidity is not thus
[email protected]           handicapped." --Elbert Hubbard


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