Worked on backend maintenance for the gofiber/contrib repository, focusing on improving API security and middleware reliability using Go. Addressed a bug in custom header parsing that previously introduced an unintended leading space when headers lacked a schema, which disrupted token lookup functionality. The solution involved refining the header parsing logic to ensure headers without schemas are processed correctly, restoring reliable token-based authentication without affecting existing header schemas. This targeted fix enhanced request processing stability and maintained backward compatibility with the API. The work demonstrated attention to correctness and reliability in backend development, emphasizing robust middleware and secure API handling practices.