Worked on the dotnet/sdk repository to enhance the Browser Refresh Middleware, focusing on improving live-reload workflows for ASP.NET Core applications. Developed support for 404-aware script injection, ensuring scripts are reliably injected even when HTTP 404 responses occur. Implemented detailed debug logging to capture instances where script injection is skipped, aiding in diagnostics and reducing silent failures. Added comprehensive unit tests in C# to validate middleware behavior across various status codes and content types. This backend development effort improved observability and streamlined issue triage, ultimately enhancing the developer experience and reliability of live reload functionality within the middleware component.