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Re: [Extra] SNIPPET (now PREVIEW) draft update

"Neil Jenkins" <neilj@fastmailteam.com> Mon, 12 November 2018 02:48 UTC

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Date: Sun, 11 Nov 2018 21:48:42 -0500
From: Neil Jenkins <neilj@fastmailteam.com>
To: extra@ietf.org
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Subject: Re: [Extra] SNIPPET (now PREVIEW) draft update
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On Mon, 12 Nov 2018, at 10:38 AM, Stuart Brandt wrote: 
> If this is the case, then it might be best to include some level of  
> recommendation in the draft that clients *not* make an effort to stay up  
> to date with any changes that the server might make. I sure would hate  
> to see <tag> FETCH 1:* (FLAGS) become <tag> FETCH 1:* (FLAGS PREVIEW),  
> adding up to 255bytes per item to the FETCH response just because  
> PREVIEW *might* change. 
 
That sounds reasonable. In the JMAP spec, the "preview" field is marked as immutable (as are all fields except keywords and mailboxes, to match IMAP). I would agree that in practice it might change if the server updates its algorithm for excluding salutations, or fixes a MIME parsing bug, (just as the latter might affect the body structure returned), but this previous value is not considered "wrong" and clients are not informed of the changes, nor expected to resync them. 
 
Neil.

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