HTTP Status Codes Cheatsheet

Use this HTTP status code cheatsheet to quickly understand common API and web responses, from success to redirects and errors.

Quick reference

200 OKRequest succeeded

201 CreatedResource created

204 No ContentSuccess with no response body

206 Partial ContentPartial response, often for ranges

301 Moved PermanentlyPermanent redirect

302 FoundTemporary redirect

304 Not ModifiedUse cached response

307 Temporary RedirectTemporary redirect preserving method

400 Bad RequestInvalid request

401 UnauthorizedAuthentication needed

404 Not FoundResource missing

500 Internal Server ErrorServer failed unexpectedly

403 ForbiddenKnown client lacks permission

405 Method Not AllowedMethod unsupported for the resource

409 ConflictRequest conflicts with current state

422 Unprocessable ContentSyntax accepted but instructions cannot be processed

429 Too Many RequestsRate limit exceeded

502 Bad GatewayInvalid upstream response

503 Service UnavailableTemporarily unavailable

504 Gateway TimeoutUpstream response timed out

CodeAPI response handling

if (response.status === 404) {
  showMissingState();
} else if (!response.ok) {
  showErrorState();
}

CodeRetry only appropriate failures

if (response.status === 429 || response.status === 503) {
  const retryAfter = response.headers.get("Retry-After");
  scheduleRetry(retryAfter);
}

HTTP Status Codes Cheatsheet includes quick reference sections, practical examples, common mistakes, tips and links to related DevKitYard tools.

This cheatsheet is a static quick reference focused on concise commands, syntax and examples.

Use it when you need to recall syntax, compare common patterns or avoid mistakes without opening a long tutorial.

Use related DevKitYard tools such as API Request Builder, API Header Generator when you need to format, validate, generate or inspect real output.