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Re: [Doh] Support requirements for Get and Post

Ben Schwartz <bemasc@google.com> Sat, 17 March 2018 17:22 UTC

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From: Ben Schwartz <bemasc@google.com>
Date: Sat, 17 Mar 2018 13:22:28 -0400
Message-ID: <CAHbrMsAkU+KKwCFpyLD40aPZLEVtRj=aEZsaC+=Y2yYwKCiEyA@mail.gmail.com>
To: Patrick McManus <pmcmanus@mozilla.com>
Cc: Ólafur Guðmundsson <olafur@cloudflare.com>, doh@ietf.org, Daniel Stenberg <daniel@haxx.se>
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Subject: Re: [Doh] Support requirements for Get and Post
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On Sat, Mar 17, 2018 at 9:47 AM, Patrick McManus <pmcmanus@mozilla.com>
wrote:

> Overall I think the draft does an OK job of describing the merits of
> get/post (post is more efficient but is not http cache friendly, get is
> needed for cases like push and is more http cache friendly). If folks think
> its imperative to have that summary in one place in the document I'm happy
> to make that change.
>
> I would think most clients relying on http caches for performance would
> use get, but if they have a DNS cache they are populating they would use
> post. A server can choose not to implement one of these (and "method not
> allowed" is the right response for that imo), but its limiting what clients
> can achieve with it.
>

SHOULD clients handle a "method not allowed" by retrying with the other
method?


>
> -P
>
>
> On Sat, Mar 17, 2018 at 1:43 PM, Patrick McManus <pmcmanus@mozilla.com>
> wrote:
>
>> push #1: anticipate other needs of the client (as mentioned)
>>
>> push #2: its a different way to express additional records if that's a
>> desirable thing (e.g. ttl granularity)
>>
>>
>>
>> On Sat, Mar 17, 2018 at 1:16 PM, Ólafur Guðmundsson <
>> olafur@cloudflare.com> wrote:
>>
>>> What is the usage case to Server push of DNS answers ?
>>>
>>> Olafur
>>>
>>>
>>> On Sat, Mar 17, 2018 at 12:40 PM, Daniel Stenberg <daniel@haxx.se>
>>> wrote:
>>>
>>>> On Sat, 17 Mar 2018, Ólafur Guðmundsson wrote:
>>>>
>>>> Post MUST be supported Get MAY be supported, when GET is not supported
>>>>> the error code retuned should be 405 (HTTP RFC 7321, section 6.5.5).
>>>>>
>>>>
>>>> You didn't say this, and it is a side-note about methods, but I still
>>>> wanted to just mention that when imlementing support for HTTP/2 server push
>>>> for DOH, you want the server to send that as a GET so that the query string
>>>> tells the client about the request it also sends the response to...
>>>>
>>>> --
>>>>
>>>>  / daniel.haxx.se
>>>
>>>
>>>
>>> _______________________________________________
>>> Doh mailing list
>>> Doh@ietf.org
>>> https://www.ietf.org/mailman/listinfo/doh
>>>
>>>
>>
>
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