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Context.RealIP fell back to net.SplitHostPort and ignored its error, so a RemoteAddr holding just an IP (no :port) came back as an empty string. Use extractIP, the helper ExtractIPDirect already uses, which accepts both forms. Backport of labstack#3054.
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Backport of #3054 to v4.
When no
IPExtractoris set,Context.RealIP()falls back tonet.SplitHostPort(RemoteAddr)and ignores the error. IfRemoteAddris a bare IP with no port (some listeners and proxies produce this), it returns an empty string.This switches the fallback to
extractIP, the helperExtractIPDirectalready uses, which handles bothip:portand a bare IP.Added bare IPv4 and IPv6
RemoteAddrcases toTestContext_RealIP. They fail before the change and pass after.go test ./...passes.