Worked on enhancing the reliability and clarity of binary artifact downloads in the swiftlang/swift-package-manager repository, focusing on backend development and HTTP client management using Swift. Addressed a critical bug by ensuring that downloaded files are only moved after receiving a successful HTTP response within the 200-299 range, preventing erroneous file operations during server errors. Improved error diagnostics by surfacing specific underlying issues, such as bad response status codes, rather than generic failure messages. These changes reduced ambiguous failure modes and accelerated debugging during dependency resolution, contributing to more resilient packaging workflows and clearer error reporting for developers using Swift.