- Add AddTrustedCIDR() method to support non-Fastly proxies - Enable trusting custom CIDR ranges (e.g., 10.0.0.0/8) - Validate CIDR format before adding to trusted list - Maintain backward compatibility with Fastly-only usage Allows mixed proxy environments where requests pass through both Fastly CDN and custom internal proxies/load balancers. Uses precise CIDR terminology instead of generic "range".