Worked on the launchdarkly/ldcli repository to enhance backend reliability and developer experience by addressing a critical issue in the development server’s CORS header configuration. Focused on backend development and API configuration using Go, the work involved correcting the Access-Control-Expose-Headers response to properly expose the Date header to browsers. This change resolved client compatibility issues and reduced debugging time related to header recognition during local development. No new user-facing features were introduced during this period, as efforts centered on stabilizing the development workflow and ensuring consistent server behavior for developers working with cross-origin requests in their local environments.