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Re: [dnsoverhttp] Survey of DNS over HTTP

Ted Hardie <ted.ietf@gmail.com> Fri, 16 September 2016 16:26 UTC

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From: Ted Hardie <ted.ietf@gmail.com>
Date: Fri, 16 Sep 2016 09:25:29 -0700
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To: Shane Kerr <shane@time-travellers.org>
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Subject: Re: [dnsoverhttp] Survey of DNS over HTTP
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On Fri, Sep 16, 2016 at 3:09 AM, Shane Kerr <shane@time-travellers.org>
wrote:

> Ted,
>
> At 2016-09-15 14:59:57 -0700
> Ted Hardie <ted.ietf@gmail.com> wrote:
>
> > Thanks for the doc.  One approach to add is using dns URIs as the target
> of
> > HTTP methods, returning the dns data using the relevant mime type.  In
> that
> > approach, you send the message over HTTP(S) with something like
> >
> > GET  dns:[//authority/]domain[?CLASS=class;TYPE=type]
> >
> > (See RFC 4501 for the full set of permitted syntax for DNS URIs)
> >
> > and return either application/dns or text/dns records for the result (See
> > RFC 4027 for the specification of the MIME types).
>
>
I'm not sure that I understand the syntax. Can you give some examples?
>
> Sure.

GET dns:example.com?TYPE=AAAA

Would ask for the AAAA record for example.com, using whatever means the
HTTP server had for supplying the record.

GET dns://8.8.8.8/example.com?TYPE=AAAA

Would ask the server to consult 8.8.8.8 and return the AAAA record it
supplied.

(The URI scheme specified in RFC 4501 allows you to specify a CLASS, but
defaults to IN, which is why it's not supplied in the examples).

You can also use URI escaping to reference IDNs:

GET dns:www.example.%E4%B8%AD%E5%9C%8B?TYPE=TEXT

regards,

Ted




> Cheers,
>
> --
> Shane
>

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