On Tue, 6 Mar 2012, Andrei Cipu wrote:

> We pinpointed the problem to our custom "Host" header, which was an IPv6
> address between [] (e.g. "Host: [2001::1]" - just like libcurl was sending
> for non-custom requests). The cookie domain was determined from this host by
> removing the part after ':' which was considered the port, leaving us with a
> host of "[2001", which did not match the domain in the cookie repository.
>
> I'm attaching a bug that solved this problem, and possibly also solves the
> bug reported by mailsvb in September 2011
> (http://curl.haxx.se/mail/archive-2011-09/0022.html ). This patch is made on
> libcurl 7.24.0.

Awesome. Thanks a lot, I've merged and pushed this now!

-- 
  / daniel.haxx.se
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