Worked on the httpwg/http-extensions repository to deliver a targeted feature clarifying intermediary error responses for incremental message rejection. Focused on reducing ambiguity in error handling, the work introduced documentation specifying the use of the 501 Not Implemented status with a Proxy-Status header for security-related rejections, aligning with the HTTP Bis Incremental specification. The approach emphasized precise, standards-aligned documentation using Markdown, ensuring consistency across implementations and supporting interoperability for proxies and clients. Maintained strong version-control practices to provide traceability from feature intent to implementation, with all changes reflected in the draft-ietf-httpbis-incremental.md to support adoption and reduce implementation risk.