During December 2024, this developer refactored header serialization in the mxsm/rocketmq-rust repository to improve broker heartbeat messaging stability and reduce repetitive code. They introduced a derive macro, RequestHeaderCodec, in Rust to automate serialization and deserialization for BrokerHeartbeatRequestHeader, eliminating the need for manual to_map and from implementations. This approach was extended to UnRegisterBrokerRequestHeader and GetBrokerMemberGroupRequestHeader, ensuring consistency across header types. By leveraging Rust macros and Protocol Buffers, the developer enhanced maintainability and reliability of the codebase. The work demonstrated a focused, in-depth solution to streamline header handling and support robust broker communication flows.