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Re: [Doh] [Ext] A question on the mix of DNS and HTTP semantics

Patrick McManus <pmcmanus@mozilla.com> Mon, 19 March 2018 16:03 UTC

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References: <CA+9kkMB7awRfW9jUmY9Q-1p+w3VLtpG5DxhF3s7Q58nEMZeX3w@mail.gmail.com> <20180318164307.GB6724@laperouse.bortzmeyer.org> <CAOdDvNr1GstB+g3pYi4w0bXuQ=Nz8HqgTRfWUX9TGu9YAYiz0w@mail.gmail.com> <CA+9kkMA733q3BPRbnN++0vwKrmOOCN8SBgknYwFaeEf2cvYikw@mail.gmail.com> <88AB1743-7270-4D72-8C70-0AB6B74416BD@icann.org> <SN1PR08MB1854485BF319264F51D208C3DAD40@SN1PR08MB1854.namprd08.prod.outlook.com> <20180319150958.GA23411@laperouse.bortzmeyer.org> <20180319152126.c5ylchfawn4syfwb@mx4.yitter.info> <20180319153958.GA24327@laperouse.bortzmeyer.org>
From: Patrick McManus <pmcmanus@mozilla.com>
Date: Mon, 19 Mar 2018 16:03:04 +0000
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To: Stephane Bortzmeyer <bortzmeyer@nic.fr>
Cc: Andrew Sullivan <ajs@anvilwalrusden.com>, DoH WG <doh@ietf.org>
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Subject: Re: [Doh] [Ext] A question on the mix of DNS and HTTP semantics
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I agree with Stephane. DNS information in non-successful HTTP responses
(i.e. not a 2xx) is not the answer to the question you asked in the HTTP
request. I can't tell you what it is - its normally just defined as human
readable explanation. It may certainly be generated by HTTP servers that do
not understand DoH.




On Mon, Mar 19, 2018 at 3:39 PM, Stephane Bortzmeyer <bortzmeyer@nic.fr>
wrote:

> On Mon, Mar 19, 2018 at 11:21:27AM -0400,
>  Andrew Sullivan <ajs@anvilwalrusden.com> wrote
>  a message of 29 lines which said:
>
> > If it were actually truncated, wouldn't the message have a TC bit
> > set?
>
> Truncated for HTTP reasons (error 500 : the server crashed), not for
> DNS reasons.
>
> If the DNS answer is truncated for DNS reasons (EDNS buffer size too
> small), I would expect the HTTP status code to be 200.
>
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