bad httplib latency due to IPv6 use

[Laszlo Nagy]

>> 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.