Did you ever face "stale singleton httpx connection" and "cold-start connection problem" problem, Well I did tonight.

The developer encountered a frustrating issue with FastAPI when they tried to implement a new feature, encountering "stale singleton httpx connection" and "cold-start connection problem" errors. This problem manifested as a "ConnectTimeout: Unauthorized 401" error when reloading the web interface locally, suggesting a potential issue with their login endpoint or refresh token handling. This situation underscores the challenges developers face when integrating new features, highlighting the importance of robust connection management and error handling in backend services.