Worked on the openai/codex repository to enhance how Cloudflare 403 errors are handled, replacing generic HTML error pages with a user-friendly message that detects Cloudflare blocks and preserves both status and request ID for improved traceability. The solution was implemented in Rust, focusing on robust backend development and comprehensive error handling. Unit tests were added to verify the new behavior and prevent regressions, ensuring reliability and maintainability. This work improved observability and debugging for blocked responses, streamlining the user experience when encountering Cloudflare restrictions. The approach emphasized API integration, thorough testing, and careful attention to backend reliability and traceability.