Re: Last Call: draft-daboo-srv-caldav (Use of SRV records for locating CalDAV and CardDAV services) to Proposed Standard

[Cyrus Daboo <[e-mail]>]

Hi Patrik,

--On June 23, 2010 10:07:44 PM +0200 Patrik Fältström <[e-mail]> 
wrote:

>> I did chat with a few server implementors about this and the feeling was
>> SRV + .well-known is a good solution that can quickly be deployed. Some
>> points:
>>
>> 1) SRV's are very deployable today - a new RR will be harder to deploy.
>>
>> 2) There is a push to support SRV's with other protocols (e.g.
>> draft-daboo-srv-email for IMAP, POP3, and Submission) so from an
>> operational standpoint its likely to be more common.
>>
>> 3) .well-known is useful in the absence of any DNS records. i.e. if no
>> SRV/URI were available, a client can still try auto-discovery by
>> attempting an HTTP connection to the host (derived from user input) and
>> the .well-known path.
>
> Hmm...regarding the new RR, the only thing I can think of today is the
> need for some changes in the provisioning system from which one create
> the DNS zones. I do not know of any DNS code today that can not handle
> "unknown" DNS RR Types, but maybe I am wrong? I am though confused over
> (1) as this is 2010 and not 1998.

I am thinking more of client APIs.

> Regarding (3), I think it is sad people move redirects and lookups and
> functionality to be on top of HTTP instead of IP. And I do not understand
> "in the absence of DNS"...that is an interesting situation ;-)
> Specifically to use that as the foundation for the architecture to use
> for calendaring, that is -- I hope -- one of the more fundamental
> applications on the Internet.

Sorry - bad wording on my part. What I meant was "in the absence of a 
service-type to hostname mapping in the DNS".

-- 
Cyrus Daboo