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Date: Wed, 17 Oct 2012 11:58:23 +0200
From: Laszlo Nagy <gandalf@shopzeus.com>
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To: Hans Mulder <hansmu@xs4all.nl>, python-list@python.org
Subject: Re: bad httplib latency due to IPv6 use
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>> What I'm wondering is this:
>> 1. The server only serves on IPv4, changing this to IPv6 would probably
>> help. However, I wouldn't consider this a bug, or?
> I'd say it's a bug in your TCP/IP stack.  An IP shouldn't take that long
> to figure out that it is not configured to connect to IPv6 addresses.
It might also be, that he has a firewall installed that is blocking 
access to ::1. In that case, it takes much more time to figure out that 
you cannot connect. Because in that case, it is not a "connection 
refused" problem, but a "trying to connect to a closed/not responding 
port" problem.