1xxInformational4 entries100ContinueRequest received, server continues processing. Rarely used directly in frontend.Request headers received, client can continue sending request body.Click to view details101Switching ProtocolsRequest received, server continues processing. Rarely used directly in frontend.Server agrees to switch protocols.Click to view details102ProcessingRequest received, server continues processing. Rarely used directly in frontend.Server has received the request and is still processing.Click to view details103Early HintsRequest received, server continues processing. Rarely used directly in frontend.Return some hints before the formal response.Click to view details
2xxSuccess5 entries200OKRequest completed successfully. API and resource status as expected.Request successful.Usage:Common when GET, PUT, PATCH succeed.201CreatedRequest completed successfully. API and resource status as expected.Resource created.Usage:POST create resource success.202AcceptedRequest completed successfully. API and resource status as expected.Request accepted but not yet processed.Usage:Async task queued.204No ContentRequest completed successfully. API and resource status as expected.Request successful but no content returned.Usage:DELETE success, update success with no body.206Partial ContentRequest completed successfully. API and resource status as expected.Return partial content of resource.Usage:Resume breakpoint, video segment loading.
3xxRedirection6 entries300Multiple ChoicesResource requires redirection or cache logic. Common in redirects and cache negotiation.Multiple responses available for request.Click to view details301Moved PermanentlyResource requires redirection or cache logic. Common in redirects and cache negotiation.Resource permanently moved.Usage:Site migration, URL permanent change.302FoundResource requires redirection or cache logic. Common in redirects and cache negotiation.Resource temporarily redirected.Usage:Redirect after login, temporary redirect.304Not ModifiedResource requires redirection or cache logic. Common in redirects and cache negotiation.Resource not modified, can use cache directly.Usage:Browser cache negotiation success.307Temporary RedirectResource requires redirection or cache logic. Common in redirects and cache negotiation.Temporary redirect, keep original request method.Click to view details308Permanent RedirectResource requires redirection or cache logic. Common in redirects and cache negotiation.Permanent redirect, keep original request method.Click to view details
4xxClient Error11 entries400Bad RequestIssue with the client request. Check parameters, permissions, URL, or rate limits first.Request format error or invalid parameters.Usage:JSON parse failed, required params missing.401UnauthorizedIssue with the client request. Check parameters, permissions, URL, or rate limits first.Authentication failed.Usage:Not logged in, token expired.403ForbiddenIssue with the client request. Check parameters, permissions, URL, or rate limits first.Identity recognized but no access permission.Usage:Insufficient role permissions, IP blocked.404Not FoundIssue with the client request. Check parameters, permissions, URL, or rate limits first.Requested resource does not exist.Usage:Wrong path, resource deleted.405Method Not AllowedIssue with the client request. Check parameters, permissions, URL, or rate limits first.Request method not allowed.Usage:Interface only supports GET but sent POST.408Request TimeoutIssue with the client request. Check parameters, permissions, URL, or rate limits first.Request timeout.Click to view details409ConflictIssue with the client request. Check parameters, permissions, URL, or rate limits first.Current resource state conflicts with request.Usage:Duplicate creation, version conflict.410GoneIssue with the client request. Check parameters, permissions, URL, or rate limits first.Resource previously existed but permanently removed.Click to view details413Payload Too LargeIssue with the client request. Check parameters, permissions, URL, or rate limits first.Request body too large.Usage:Upload file exceeds limit.429Too Many RequestsIssue with the client request. Check parameters, permissions, URL, or rate limits first.Request frequency too high, rate limit triggered.Usage:High frequency polling, batch concurrent requests.431Request Header Fields Too LargeIssue with the client request. Check parameters, permissions, URL, or rate limits first.Request headers too large.Click to view details
5xxServer Error8 entries500Internal Server ErrorServer internal or gateway errors. Check logs, dependencies, and timeout chains.Server internal error.Usage:Code exception, database execution failed.501Not ImplementedServer internal or gateway errors. Check logs, dependencies, and timeout chains.Server does not support current functionality.Click to view details502Bad GatewayServer internal or gateway errors. Check logs, dependencies, and timeout chains.Gateway received invalid response from upstream.Usage:Reverse proxy, gateway forward to backend failed.503Service UnavailableServer internal or gateway errors. Check logs, dependencies, and timeout chains.Service currently unavailable.Usage:Maintenance, overload protection.504Gateway TimeoutServer internal or gateway errors. Check logs, dependencies, and timeout chains.Gateway timeout waiting for upstream.Usage:Backend slow query, dependency response too slow.505HTTP Version Not SupportedServer internal or gateway errors. Check logs, dependencies, and timeout chains.Server does not support current HTTP version.Click to view details507Insufficient StorageServer internal or gateway errors. Check logs, dependencies, and timeout chains.Server storage space insufficient.Click to view details508Loop DetectedServer internal or gateway errors. Check logs, dependencies, and timeout chains.Loop processing detected.Click to view details