Developed a customizable HTTP client integration for fetch requests in the awslabs/llrt repository, enabling injection of a user-provided hyper::Client across both llrt_core and llrt_http. This work focused on refactoring HTTP client initialization to support external network and security policies, improving configurability for enterprise deployments while maintaining backward compatibility. The implementation required careful cross-crate coordination and API refactoring, leveraging Rust’s asynchronous programming capabilities and the hyper library. By allowing external configuration of HTTP clients, the solution reduced operational friction for teams with specialized networking requirements and demonstrated a strong grasp of dependency injection and robust networking practices in Rust.