Brie Bennett developed initial support for HTTP 103 Early Hints responses in the fastly/Viceroy repository, focusing on backend improvements using Rust and HTTP protocol handling. She implemented basic 103 handling with integrated logging, allowing for better observability and maintainability. To ensure robust functionality, Brie expanded the test suite to validate Early Hints behavior and addressed related test issues, improving compatibility and reliability. Her work laid the foundation for future performance optimizations by enabling Early Hints flow, which can reduce client-side latency and enhance resource loading. The technical approach emphasized thorough testing and dependency management to support ongoing backend development.