During their tenure, Fengyuwusong developed a feature for the tailcallhq/tailcall repository that introduced the Connect-Protocol-Version header to all gRPC requests using the ConnectRPC transformer. This addition ensured compatibility with services requiring protocol version 1, addressing integration challenges for clients dependent on the Connect protocol. The implementation involved updating both the generated SDL and HTTP configurations to propagate the new header across all relevant RPC methods. Working primarily with Rust, Protocol Buffers, and API Gateway technologies, Fengyuwusong delivered a focused solution that improved cross-service interoperability, demonstrating a clear understanding of protocol versioning and its impact on distributed system communication.