[bosvaldas]

Reason for This PR

RFC 7239 requires an IPv6 node in Forwarded to be bracketed and quoted, also without a port: for="[2001:db8:cafe::17]". parseForwarded trims the quotes but keeps the brackets, so RemoteAddr becomes [2001:db8:cafe::17]. That is neither host:port nor an IP, so the http plugin's FetchIP logs remote address parsing failure ... missing port in address and PHP receives an empty REMOTE_ADDR.

We hit this in production behind a trusted proxy: affected requests reached the application with an empty client IP.

Description of Changes

• parseForwarded strips the brackets from a bracketed IPv6 node that has no port. [v6]:port is returned unchanged, as before.
• Unit case in TestIP and an end-to-end case in TestForwarded. Against master the latter fails with expected: "2001:db8:cafe::17", actual: "".

License Acceptance

By submitting this pull request, I confirm that my contribution is made under
the terms of the MIT license.

PR Checklist

• All commits in this PR are signed (git commit -s).
• The reason for this PR is clearly provided (issue no. or explanation).
• The description of changes is clear and encompassing.
• Any required documentation changes (code and docs) are included in this PR.
• Any user-facing changes are mentioned in CHANGELOG.md (generated by release-please from the commit title).
• All added/changed functionality is tested.