Worked on enhancing HTTP header handling and authentication logic in the Blargian/ClickHouse and ClickHouse/ClickHouse repositories using C++. Addressed edge cases in HTTP interoperability by implementing case-insensitive header matching, introducing a custom comparison struct for std::set to ensure consistent header lookup. Fixed issues with forward headers and authentication client parameters, improving reliability in diverse networking scenarios. Subsequently refactored the HTTP Authentication Client, encapsulating comparison logic and transitioning header storage from set to vector for better code organization. Focused on code style and maintainability, these changes improved readability and laid a foundation for future feature development without altering runtime behavior.