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Re: [Uri-review] URI scheme registration request

Dave Thaler <dthaler@microsoft.com> Sat, 14 November 2015 23:37 UTC

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From: Dave Thaler <dthaler@microsoft.com>
To: John Wason <wason@wasontech.com>
Thread-Topic: [Uri-review] URI scheme registration request
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Subject: Re: [Uri-review] URI scheme registration request
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Short answer: unfortunately no

This was the subject of issue #16:
http://trac.tools.ietf.org/wg/appsawg/trac/ticket/16

It was discussed at IETF 89 and then again at IETF 90. In both cases, and as confirmed on the list,
the consensus of the WG was to not allow a notion of wildcards.   Instead you have to individually
register each such scheme.  I see “svn+ssh” is not currently registered, but it sounds like it ought to be.

Dave

From: John Wason [mailto:wason@wasontech.com]
Sent: Saturday, November 14, 2015 2:21 PM
To: Dave Thaler <dthaler@microsoft.com>; Roy T. Fielding <fielding@gbiv.com>
Cc: uri-review@ietf.org
Subject: Re: [Uri-review] URI scheme registration request

Is it possible to register a "wildcard" or have an understanding that the scheme can be appended with the transport type?  Subversion uses "svn+ssh" to specify an ssh tunnel.  This format seems to be used occasionally in practice.  Because the different transports can point to completely different resources on the same host I am not sure having the transport in the query portion is the correct solution.

On 11/14/2015 3:07 PM, Dave Thaler wrote:
Roy T. Fielding wrote:
> A URI scheme should define what it names and how that naming maps to the URI syntax.
> There is nothing wrong with using separate schemes for different transports if those transports
> are essential parts of the name (e.g., if something named Fred at TCP:80 is different from something
> named Fred at UDP:89898).  (I prefer using dots, like rr.tcp and rr.udp and rr.tcp.tls.)

Careful… RFC 7595 states:
   Furthermore, to prevent collisions with private-use scheme names, new
   scheme names registered MUST NOT contain a "." unless actually
   constructed from a reversed domain name.

So rr.tcp should only be done if you register rr as a TLD, and since rr is 2 letters, it’s reserved for a country code.

Dave




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