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https://issues.apache.org/jira/browse/IMAP-374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13639436#comment-13639436
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Andrzej Rusin commented on IMAP-374:
------------------------------------
Eric,
Reading that request line can be quite boring, but it starts like this:
5bnb UID FETCH 16301,16320,16323,16327,16330:16331,16335:16336
and continues that way for several screens, ending with
3352087:3352170 (UID FLAGS RFC822.SIZE BODY.PEEK[HEADER])
The client is of course from the "640K enough for everyone" gang. Vintage 2007.
I believe that a practical limit for now is about the 64K-128K range. But
universe produces better idiots all the time.
> Client command line length limit is problematic
> -----------------------------------------------
>
> Key: IMAP-374
> URL: https://issues.apache.org/jira/browse/IMAP-374
> Project: James Imap
> Issue Type: Bug
> Components: Protocol
> Reporter: Andrzej Rusin
> Assignee: Eric Charles
>
> I believe (based on some observations) that:
> A) maximum client command line length in James IMAP is 8192 as defined in
> org.apache.james.protocols.netty.AbstractChannelPipelineFactory.MAX_LINE_LENGTH.
> B) I do not think that IMAP RFC limits the line length, at least I did not
> find any reference of that.
> C) James IMAP does not seem to reply with BAD when it sees a too long line.
> D) Some clients send quite long lines (I just saw one about 23000 characters
> and sky is the limit) and they probably expect some answer, hanging
> indefinitely.
> So:
> 1. If B is true, then we should not practically really limit in A; or rather
> the limit should be really high. And looks like 640K is not enough for
> everyone anymore ;)
> 2. Probably C should be fixed.
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