Understanding HTTP Status Codes: A Complete Guide to 1xx–5xx Responses

HTTP status codes are three-digit numbers where the first digit denotes the response class and the last two digits specify the particular condition.

1xx – Informational

100 : Continue – initial request received, client should continue sending the rest.

101 : Switching Protocols – server will switch to a different protocol as requested.

2xx – Success

200 : OK – request succeeded and the server returned the requested resource.

201 : Created – request succeeded and a new resource was created.

202 : Accepted – request accepted for processing but not yet completed.

203 : Non‑Authoritative Information – returned meta‑information from a third‑party source.

204 : No Content – request succeeded but no content is returned.

205 : Reset Content – request succeeded, client should reset the document view.

206 : Partial Content – server is delivering part of the resource due to a range request.

3xx – Redirection

300 : Multiple Choices – multiple options for the resource are available.

301 : Moved Permanently – resource has a new permanent URI.

302 : Found – resource temporarily resides under a different URI.

303 : See Other – response can be found at another URI using a GET request.

304 : Not Modified – resource has not changed since last request.

305 : Use Proxy – requested resource must be accessed through the proxy.

307 : Temporary Redirect – same as 302 but the request method must not change.

4xx – Client Errors

400 : Bad Request – server cannot understand the request due to malformed syntax.

401 : Unauthorized – authentication is required and has failed or not been provided.

402 : Payment Required – reserved for future use.

403 : Forbidden – server refuses to fulfill the request.

404 : Not Found – server cannot find the requested resource.

405 : Method Not Allowed – request method is not supported for the resource.

406 : Not Acceptable – server cannot produce a response matching the list of acceptable values.

407 : Proxy Authentication Required – client must authenticate with the proxy.

408 : Request Timeout – server timed out waiting for the request.

409 : Conflict – request could not be completed due to a conflict with the current state of the resource.

410 : Gone – resource is permanently unavailable.

411 : Length Required – server refuses to accept request without a defined Content‑Length.

412 : Precondition Failed – server does not meet one of the preconditions specified in the request.

413 : Payload Too Large – request entity is larger than the server is willing or able to process.

414 : URI Too Long – the URI provided was too long for the server to process.

415 : Unsupported Media Type – request entity has a media type which the server or resource does not support.

416 : Range Not Satisfiable – client has asked for a portion of the file, but the server cannot supply that portion.

417 : Expectation Failed – server cannot meet the requirements of the Expect request-header field.

5xx – Server Errors

500 : Internal Server Error – generic error message when the server encounters an unexpected condition.

501 : Not Implemented – server does not support the functionality required to fulfill the request.

502 : Bad Gateway – server received an invalid response from an upstream server.

503 : Service Unavailable – server is currently unable to handle the request due to overload or maintenance.

504 : Gateway Timeout – server did not receive a timely response from an upstream server.

505 : HTTP Version Not Supported – server does not support the HTTP protocol version used in the request.