John J Lee <jj...@users.sourceforge.net> added the comment:

Looks like a bug.  Here's the trac bug that this caused -- trac fixed their bug 
by working around this bug in a really ugly way:

http://trac.edgewall.org/ticket/2256

It would be nice to notify the trac developers if/when this is fixed.

This bug is probably not specific to colons (e.g. commas used to be valid in 
HTTP cookie strings, and still are as far as I know -- somebody should test 
what current browsers do to make sure).  The set of characters regarded as 
legal is less important than the fact that parsing a Cookie header should 
*never* raise CookieError -- it should just ignore any invalid cookies.  Still, 
IIRC there isn't any need to treat any of them as invalid, since more or less 
anything is a valid cookie (or was in the past -- as I say, maybe browsers have 
cleaned up since then, but I'd be surprised).

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<http://bugs.python.org/issue2193>
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