Phase 1 · Internet & Backend Basics
TopicsHTTP Status Codes
Part of the Backend Developer Roadmap.
Summary
Three-digit codes (200, 201, 400, 401, 404, 500...) that tell the client what happened with their request — precise status codes make an API self-documenting.
How to Learn This
- 1Memorize the 5 status code classes (1xx-5xx) and what each range signals.
- 2Practice returning the correct status code for common scenarios (created, not found, validation error).
- 3Learn the difference between 401 (unauthenticated) and 403 (unauthorized).
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