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Re: [imapext] IMAP Capability Registry and RFC 5524: URLFETCH=BINARY vs URLAUTH=BINARY

Alexey Melnikov <alexey.melnikov@isode.com> Tue, 19 May 2020 15:49 UTC

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To: Дилян Палаузов <dilyan.palauzov@aegee.org>, Dave Cridland <dave@cridland.net>
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From: Alexey Melnikov <alexey.melnikov@isode.com>
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Date: Tue, 19 May 2020 16:48:58 +0100
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Subject: Re: [imapext] IMAP Capability Registry and RFC 5524: URLFETCH=BINARY vs URLAUTH=BINARY
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Hi Дилян,

On 17/05/2020 15:55, Дилян Палаузов wrote:
> Hello,
>
> The Internet Message Access Protocol (IMAP) Capabilities Registry at
> https://www.iana.org/assignments/imap-capabilities/imap-capabilities.xhtml
> says:
>
> URLFETCH=BINARY 	[RFC5524]
>
> and RFC 5524, https://tools.ietf.org/html/rfc5524 says:
>
>
> 3.  Extended URLFETCH
>
>     This extension is available in any IMAP server implementation that
>     includes URLAUTH=BINARY within its capability string.
>
> 5. Formal Syntax
>
>     capability       =/ "URLAUTH=BINARY"
>
> 6.  IANA Considerations
>
>     This document defines the URLFETCH=BINARY IMAP capability.  IANA has
>     added it to the registry accordingly.
>
> My reading is, that the URLAUTH=BINARY and URLFETCH=BINARY capabilities
> mean the same.
I think one of these is a typo. I suspect "URLFETCH=BINARY" should be 
"URLAUTH=BINARY", because "URLAUTH" is already registered as a 
Capability. Dave?
> Please comment within a month on the following proposal for erratum:
>
> New text:
>
> 3.  Extended URLFETCH
>
>     This extension is available in any IMAP server implementation that
>     includes URLAUTH=BINARY or URLFETCH=BINARY within its capability
>     string.
>
> 5.  Formal Syntax
>
>   capability       =/ "URLAUTH=BINARY" / "URLFETCH=BINARY"
>
>        ; Command parameters; see Section 3.1
>
> 6.  IANA Considerations
>
>     This document defines the URLFETCH=BINARY and the URLAUTH=BINARY
> IMAP capabilities.  Both capabilities mean the same. IANA has added
> URLFETCH=BINARY and will add URLAUTH=BINARY to the registry
> accordingly.

If it is a typo, I would edit your suggestion to recommend one or 
another, not both.

Best Regards,

Alexey

> I do not insist to do the wording, anybody can take this over.
>
> If there is knowledge, that all implementations have consolidated on a
> single capability wording, then the erratum can get smaller.
>
> Greetings
>    Дилян
>
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