[Bug 1547640] Re: proxy tries ipv6 and gets 503 when no ipv6 routes

[Paul Gear]

@yadi: link-local only was the proposal by @andreserl (not RFC1918, or
its IPv6 equivalent, ULA), and that is completely doable.  So is
detection of an isolated, but not link-local-only network.  It's simple
- if there's no route in the local routing table to the destination, it
should be excluded from attempts.  This would work for both IPv4 and
IPv6, regardless of the presence of NAT, because NAT still requires a
route to the destination in order to function.

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Title:
  proxy tries ipv6 and gets 503 when no ipv6 routes

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