56 lines
2.3 KiB
Plaintext
56 lines
2.3 KiB
Plaintext
MBOX-Line: From mrc at CAC.Washington.EDU Fri Nov 16 10:59:19 2007
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To: imap-protocol@u.washington.edu
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From: Mark Crispin <mrc@CAC.Washington.EDU>
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Date: Fri Jun 8 12:34:40 2018
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Subject: [Imap-protocol] FETCH/STORE on out-of-range sequence number
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In-Reply-To: <6199.1195236170.977095@invsysm1>
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References: <2123708120.202451195235056495.JavaMail.root@dogfood.zimbra.com>
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<6199.1195236170.977095@invsysm1>
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Message-ID: <alpine.OSX.0.99999.0711161051240.7038@pangtzu.panda.com>
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On Fri, 16 Nov 2007, Dave Cridland wrote:
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> 4.1.2 is actually rather painful, because it's suggesting different client
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> behaviour from the base spec. It can, and will, either confuse clients, or
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> outright break them, including putting them into a loop, asking for the same
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> data continuously.
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Correct. All of these have been observed from 4.1.2.
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> 4.1.3 is the least obtrusive of the "broken" behaviours, since it's quite
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> likely that the client will shortly do something allowing the EXPUNGE to be
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> sent.
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Yes...but the problem is that 4.1.3 causes static data to change.
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> Ideally, 4.1.1 should be done, but I do sympathize with the issues this
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> can cause.
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These issues are ONLY server-internal issues.
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> 4.1.4 is likely to confuse some clients, albeit to a lesser extent
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> than 4.1.2, but I'd rather 4.1.3, in general - even if technically broken.
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Speaking as someone who has done 4.1.1, 4.1.3, and 4.1.4:
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4.1.1 is absolutely the best behavior for clients; and after all these
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years all new server implementations should choose it. This has also been
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the standard behavior in my server for current technology formats.
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4.1.3 has caused clients to crash in the past, and I have little doubt
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that it would in the future. My server only does it for the legacy mh
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format. The only good thing that you can say about 4.1.3 is that it is
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not 4.1.2 which causes worse behavior.
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I have NEVER seen any client confusion due to 4.1.4. For YEARS, that was
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the primary behavior in my server; and it remains the standard behavior
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for some older formats. A client MUST handle 4.1.4, because 4.1.4 is
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indistinguishable from a timing race where an external process turned off
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the \Deleted flag.
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-- Mark --
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http://panda.com/mrc
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Democracy is two wolves and a sheep deciding what to eat for lunch.
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Liberty is a well-armed sheep contesting the vote.
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