During December 2025, the developer focused on backend stability for the kenzok8/sublink-worker repository, addressing a critical issue in WebSocket proxy handling. By correcting the casing of the Host header from 'Host' to 'host' within SurgeConfigBuilder.js, they ensured compatibility with proxy expectations and improved header processing reliability. This targeted JavaScript bug fix reduced the risk of proxy-related failures in production environments and enhanced overall system robustness. Although no new features were introduced during this period, the developer demonstrated attention to detail and a strong grasp of backend development principles, prioritizing maintainability and operational readiness for future enhancements.