wget does not seem to support interface scoping for IPv6 addresses. For
example, http_proxy=http://[fe80::babe:ff:ffff:babe%eth0]:8118/ . Curl
supports this.
This fixes most of the failures for IPv6 related addresses. Hide the
last failure as there does not seem to be a proper fix from OS level:
when using link local addresses, if a hostname is resolved to IPv6 link
local address, it is not scoped to that interface. It can't properly be
used by any tool then.
d3f386733f