HTTP Status Codes Explained Simply
Every HTTP status code is the server answering one specific question, and once you know which question each code answers, debugging an API gets a lot less mysterious. This tutorial walks through the six codes that cover almost every response you'll ever see from a REST API: 200, 401, 403, 404, 429, and 500. You'll get the real difference between 401 (unauthenticated, the server doesn't know who you are) and 403 (unauthorized, the server knows and still says no), why 429 needs a Retry-After header, and why a 500 is never your fault.
📌 WHAT YOU'LL LEARN
Why 401 means unauthenticated and 403 means unauthorized, and the mnemonic that keeps them straight
The two flavors of 404, including why some APIs return 404 instead of 403 on private resources
How to read a 429 Retry-After header and why exponential backoff matters
Why 500 is different from 502, 503, and 504, and what each one actually points at
The WWW-Authenticate header most 401 responses skip
Why 429 wasn't in the original HTTP spec (RFC 6585, April 2012)
🔗 Links
MDN HTTP status code reference: https://developer.mozilla.org/en-US/d...
RFC 9110 (HTTP semantics): https://www.rfc-editor.org/rfc/rfc911...
RFC 6585 (added 429): https://www.rfc-editor.org/rfc/rfc658...
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