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[Ace] ace-coap-est-08: using /skg with Accept Option set to TBD287

Esko Dijk <esko.dijk@iotconsultancy.nl> Tue, 12 February 2019 15:02 UTC

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From: Esko Dijk <esko.dijk@iotconsultancy.nl>
To: "ace@ietf.org" <ace@ietf.org>
Thread-Topic: ace-coap-est-08: using /skg with Accept Option set to TBD287
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Subject: [Ace] ace-coap-est-08: using /skg with Accept Option set to TBD287
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Dear authors & WG,

A question on the new -08 text regarding the /skg response:  the text indicates the following request & response

Client:
  POST /.well-known/est/skg
    Accept: TBD287
    Content-Format: 286

Server:
  2.04
  Content-Format: 62

So the client asks for 286, but gets 62 (which has 286 embedded in it as one of the parts). At first sight this appears incompatible with CoAP RFC7252 logic.
A strict server implementation might return 4.06 Not Acceptable since the server code has registered the response type to be 62; and the client asks something different.

Maybe the draft-ietf-core-multipart-ct should extend the semantics of “Accept” to cover this case?

(Or would we rather fall back to returning PKCS#7 always, within the multipart content.
It would be possible to define a /skg2 URI that returns the other multipart format.
Or we could even define a new content format TBD which encodes a multipart type including a TBD287, so the client can use the Accept Option as normal to request the wanted multipart type.)

Regards
Esko

Esko Dijk IoT Consultancy |  Email/Skype: esko.dijk@iotconsultancy.nl<mailto:esko.dijk@iotconsultancy.nl>

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