Worked on the openclaw/openclaw repository to enhance backend security by implementing the X-Content-Type-Options nosniff header across all media route responses, including both successful and not-found cases. This feature aimed to prevent MIME sniffing and mitigate XSS risks, directly improving the security posture and compliance of the application. The approach involved TypeScript for backend development, focusing on HTTP response hardening and test-driven validation. Tests were updated to ensure the new header’s presence, providing regression protection and clear traceability through commit history. No major bugs were addressed during this period, as security improvements were prioritized for ongoing reliability.