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fix(ip): handle zoned IPv6 proxy peers in v4 - #3226
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Backport of #3222 to v4. Closes #3179 for v4.
extractIPremoves the IPv6 zone from the peer address, with or without a port.ExtractIPFromXFFHeaderandExtractIPFromRealIPHeadernow trust link-local proxies such as[fe80::1%eth0]:8080.Behavior change:
RealIP()andExtractIPDirect()return a link-local peer without its zone (fe80::1, notfe80::1%eth0).