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Re: [Doh] Support requirements for Get and Post

"Hewitt, Rory" <rhewitt@akamai.com> Mon, 19 March 2018 22:05 UTC

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From: "Hewitt, Rory" <rhewitt@akamai.com>
To: Petr Špaček <petr.spacek@nic.cz>, "doh@ietf.org" <doh@ietf.org>
Thread-Topic: [Doh] Support requirements for Get and Post
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Date: Mon, 19 Mar 2018 22:05:37 +0000
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References: <CAN6NTqzkUeF79y=heQ7PK7T3mQVDDk5WRtqB-npi6PuQ2s5bNQ@mail.gmail.com> <alpine.DEB.2.20.1803171337530.1331@tvnag.unkk.fr> <CAN6NTqykeU1gT0TaDKahBPeF-a8gwYG7gsAEK_aSE0fNP-AsfQ@mail.gmail.com> <CAOdDvNq7e5YGtUap6tHu34zX5q1PvmQjAh+fc0m=xcRDUrmKhA@mail.gmail.com> <CAOdDvNqGvPRH3SzP_tkHVZHr-geacqDBa+QfoqXGVxFWW2qr2A@mail.gmail.com> <CAHbrMsAkU+KKwCFpyLD40aPZLEVtRj=aEZsaC+=Y2yYwKCiEyA@mail.gmail.com> <CAOdDvNpFqavszS_OzOdOOd+e0E+ufDcqkyQzCrnAtWPZnKEZFQ@mail.gmail.com> <CAHbrMsBYcO_1v-dPKP8vvubqfjLyRJhZPsmHHE_ReVRiczbuYA@mail.gmail.com> <23215.63984.364570.759118@gro.dd.org> <CAOdDvNqVE3mDJ31fKs0zLY8Lu-Pt2oeZ2UtbOorz3=TeiaBxRg@mail.gmail.com> <958176d9-00cd-e8ba-8c74-c6c736ab99e8@nic.cz>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/doh/O-MbA7Ey455dL5dI2HUm94uTEpA>
Subject: Re: [Doh] Support requirements for Get and Post
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This thought has occurred to me also...

At an ABSOLUTE MINIMUM, we'd need GET for typical DNS requests and POST for e.g. AXFR. But if we didn't worry about AXFR (yet), then maybe only GET.

Of course, complex queries can get pretty out of hand size-wise, especially if we're passing a Base64-encoded udpwireformat query string...

Rory

-----Original Message-----
From: Petr Špaček [mailto:petr.spacek@nic.cz] 
Sent: Monday, March 19, 2018 3:00 PM
To: doh@ietf.org
Subject: Re: [Doh] Support requirements for Get and Post

On 19.3.2018 19:01, Patrick McManus wrote:
> this is an open issue I was planning to address with f2f time of the 
> wg as part of the slot related to this document (of course in addition 
> to any mailing list comments).
> 
> On Mon, Mar 19, 2018 at 5:57 PM, Dave Lawrence <tale@dd.org 
> <mailto:tale@dd.org>> wrote:
> 
>     Ben Schwartz writes:
>     > So does that mean that a DOH server and client that both comply with all
>     > SHOULD-strength requirements still may not be able to exchange any DNS data?
>     > That seems like a weaker guarantee of compatibility than is typical at the
>     > IETF.
> 
>     Has an answer to this question come through yet?
> 
>     > If following all the SHOULD-level recommendations is not sufficient
>     > to ensure compatibility, then as an implementor I would appreciate
>     > some clear additional guidance on what I have to do to make my
>     > client compatible with any compliant DOH server (and vice versa as a
>     > server implementor).
> 
>     Very much agree.
A subversive question:
Do we *actually* need GET and POST? Could we get away with just one of these?

Please apologize my lack of HTTP knowledge, but it seems to me weird to start with both (as opposed to gradual addition of new ones as necessary).

--
Petr Špaček  @  CZ.NIC

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