HTTP documented errors
Browse documented HTTP errors with exact messages, troubleshooting context, and practical remediation steps.
Authentication
Authentication errors
Configuration
Configuration errors
General
General errors
400 Bad RequestHTTP 400 Bad RequestThe server rejected the request because it considers the request malformed or invalid and will not process it as sent.
404 Not FoundHTTP 404 Not FoundThe server cannot find the requested resource at the given URL, though it does not necessarily indicate whether the absence is temporary or permanent.
410 GoneHTTP 410 GoneThe server indicates that the requested resource has been permanently removed and is not expected to return.
Networking
Networking errors
408 Request TimeoutHTTP 408 Request TimeoutThe server timed out waiting for the client to send a complete request in the allowed time window.
413 Content Too LargeHTTP 413 Content Too LargeThe server refused to process the request because the request body is larger than the server is willing or able to handle.
414 URI Too LongHTTP 414 URI Too LongThe server refused the request because the target URI is longer than the server is willing to interpret.
429 Too Many RequestsHTTP 429 Too Many RequestsThe client sent too many requests in a given time window and the server rate-limited further access temporarily.
502 Bad GatewayHTTP 502 Bad GatewayA server acting as a gateway or proxy received an invalid response from the upstream server it depends on.
504 Gateway TimeoutHTTP 504 Gateway TimeoutA gateway or proxy server did not receive a timely response from the upstream server it needed to complete the request.
Runtime
Runtime errors
500 Internal Server ErrorHTTP 500 Internal Server ErrorThe server encountered an unexpected condition that prevented it from fulfilling the request.
503 Service UnavailableHTTP 503 Service UnavailableThe server is temporarily unable to handle the request, often because it is overloaded or down for maintenance.