Adds tests for issue #2757 IP extraction edge cases where RemoteAddr
may not include a port. The enhanced extractIP function now properly
handles IPv4/IPv6 addresses without ports using net.ParseIP validation.
Test cases cover:
- IPv4 without port
- IPv6 without port
- IPv6 with port brackets
- Invalid IP format handling
Existing tests for issue #2789 response flush error handling are already
comprehensive and validate the improved error messages with ResponseWriter types.
Fixes#2757🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
* Fix incorrect return ip value for RealIpHeader
* Improve test file to compare correct real IPs to each other and have better comments
* Refactor ip extractor tests to be more readable (longer but readable)
Co-authored-by: toimtoimtoim <desinformatsioon@gmail.com>
