During November 2025, contributed to the grpc/grpc-java repository by developing a feature that enhances proxy connectivity through support for custom HTTP headers in HTTP CONNECT proxy connections. This work involved extending the existing API in a backward-compatible manner, allowing users to specify optional headers without disrupting current implementations. The solution required integrating Java and Netty, specifically by converting header maps to Netty HttpHeaders within the protocol negotiation layer. Comprehensive updates were made to tests and documentation to ensure clarity and maintain compatibility. The focus on backend development and API design addressed advanced use cases for corporate proxy environments while preserving stability.