Debug and Fix a Broken Service Function

Problem

Given a small, buggy request-handling function (off-by-one, race, or wrong error handling), find and fix the bugs and explain each.

Example

Refactor a function that mis-handles edge cases under concurrency

Constraints

• Realistic day-to-day code, not a puzzle

What Cloudflare looks for

Practical debugging and refactoring over whiteboard tricks. Add tests for the cases you fixed.