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HTTP Status Codes Cheat Sheet

HTTP status codes are grouped by their first digit: 2xx means success, 3xx means redirection, 4xx means a client error, and 5xx means a server error. This cheat sheet lists the most common codes in each group with plain-language meanings.

2xx — Success

200 OKThe request succeeded

201 CreatedA new resource was created

202 AcceptedRequest accepted, processing not complete

204 No ContentSuccess, but no body to return

3xx — Redirection

301 Moved PermanentlyResource permanently moved to a new URL

302 FoundTemporary redirect to another URL

304 Not ModifiedCached copy is still valid

307 Temporary RedirectTemporary redirect, keep the same method

308 Permanent RedirectPermanent redirect, keep the same method

4xx — Client Errors

400 Bad RequestThe server couldn't understand the request

401 UnauthorizedAuthentication is required or failed

403 ForbiddenAuthenticated, but not allowed

404 Not FoundThe resource doesn't exist

409 ConflictRequest conflicts with current state

429 Too Many RequestsRate limit exceeded

5xx — Server Errors

500 Internal Server ErrorA generic server-side failure

502 Bad GatewayInvalid response from an upstream server

503 Service UnavailableServer overloaded or down for maintenance

504 Gateway TimeoutUpstream server didn't respond in time