- Add CIDR subnet matching for trustedProxies (e.g., 188.114.96.0/20)
- Support both IPv4 and IPv6 CIDR ranges
- Add multi-proxy chain support for X-Forwarded-For header
- Walk XFF chain right-to-left to find real client through proxy layers
- Use ip-address npm package for robust IP/CIDR validation
- Add comprehensive unit tests for CIDR matching and proxy chains
- Add e2e test for CIDR range validation
- Update documentation with CIDR examples and multi-proxy setup
