In September 2025, Tommy Pauly contributed to the httpwg/http-extensions repository by delivering a targeted feature that clarifies error handling for intermediaries rejecting incremental HTTP messages. He documented the use of the 501 Not Implemented status code alongside the Proxy-Status header, standardizing security-related rejection responses and aligning with the HTTP Bis Incremental specification. Working primarily with Markdown and focusing on technical documentation, Tommy updated the draft-ietf-httpbis-incremental.md to ensure consistent behavior across implementations. His disciplined approach to version control and documentation provided clear traceability from feature intent to implementation, supporting interoperability and smoother adoption by proxy and client developers.