HTTP status codes — quick cheat sheet ✅ 200 OK: request succeeded 🆕 201 Created: new resource saved 📝 204 No Content: success, nothing to return 🔀 301 Moved Permanently: use new URL ↪ 302 Found: temporary redirect 🧾 304 Not Modified: use cached version


🙅 400 Bad Request: invalid input 🪪 401 Unauthorized: missing/invalid auth 🚫 403 Forbidden: authenticated but not allowed ❓ 404 Not Found: resource doesn’t exist ⏳ 408 Request Timeout: client took too long 🧯 409 Conflict: state/version clash


💥 500 Internal Server Error: server crashed 🛠 502 Bad Gateway: upstream failed 🕸 503 Service Unavailable: overloaded/maintenance ⌛ 504 Gateway Timeout: upstream too slow


tips • return precise codes; don’t default to 200/500 • include a machine-readable error body (code, message, details) • never leak stack traces in production • pair 304 with ETag/If-None-Match for caching


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