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List of HTTP Status Codes

As a part of the HTTP (Hypertext Transfer Protocol) 0.9 specifications, the World Wide Web Consortium (W3C) established HTTP status codes in 1992. Tim Berners-Lee, who invented the web and the first web browser in 1990, defined the status codes.

The following table provides a brief overview of HTTP response status codes. The first digit of the status code specifies one of five standard classes of HTTP status responses. The message phrases shown are typical, but any human-readable alternative may be provided.

It is the responsibility of the Internet Assigned Numbers Authority (IANA) to maintain the official registry of HTTP status codes. It is also useful to note that Microsoft’s Internet Information Services (IIS) may also use additional decimal sub-codes for more specific information. These sub-codes only appear in the response payload and documentation.

If you are experiencing issues with your own company website, it may relate to the server, hosting environment, CMS (Content Management System) such as WordPress or an aspect of the website design itself.

HTTP Error Codes

Code Meaning Description
100 Continue Confirms the client about the arrival of the first part of the request and informs to continue with the rest of the request or ignore if the request has been fulfilled
101 Switching Protocols Informs the client about the server switching the protocols to that specified in the Upgrade message header field during the current connection.
103 Checkpoint Used in the resumable requests proposal to resume aborted PUT or POST requests.
200 OK Standard response for successful requests
201 Created Request fulfilled and new resource created
202 Accepted Request accepted, but not yet processed
203 Non-Authoritative Information Returned meta information was not the definitive set from the origin server.
204 No Content Request succeeded without requiring the return of an entity-body
205 Reset Content Request succeeded but require resetting of the document view that caused the request
206 Partial Content Partial GET request was successful
300 Multiple Choices Requested resource has multiple choices at different locations.
301 Moved Permanently Resource permanently moved to a different URL.
302 Found Requested resource was found under a different URL but the client should continue to use the original URL.
303 See Other Requested response is at a different URL and can be accessed only through a GET command.
304 Not Modified Resource not modified since the last request.
305 Use Proxy Requested resource should be accessed through the proxy specified in the location field.
306 No Longer Used Reserved for future use
307 Temporary Redirect Resource has been moved temporarily to a different URL.
400 Bad Request Syntax of the request not understood by the server.
401 Not Authorized Request requires user authentication
402 Payment Required Reserved for future use.
403 Forbidden Server refuses to fulfil the request.
404 Not Found Document or file requested by the client was not found.
405 Method Not Allowed Method specified in the Request-Line was not allowed for the specified resource.
406 Not Acceptable Resource requested generates response entities that has content characteristics not specified in the accept headers.
407 Proxy Authentication Required Request requires the authentication with the proxy.
408 Request Timeout Client fails to send a request in the time allowed by the server.
409 Conflict Request was unsuccessful due to a conflict in the state of the resource.
410 Gone Resource requested is no longer available with no forwarding address
411 Length Required Server doesn’t accept the request without a valid Content-Length header field.
412 Precondition Failed Precondition specified in the Request-Header field returns false.
413 Request Entity Too Large Request unsuccessful as the request entity is larger than that allowed by the server
414 Request URL Too Long Request unsuccessful as the URL specified is longer than the one, the server is willing to process.
415 Unsupported Media Type Request unsuccessful as the entity of the request is in a format not supported by the requested resource
416 Requested Range Not Satisfiable Request included a Range request-header field without any range-specifier value
417 Expectation Failed Expectation given in the Expect request-header was not fulfilled by the server.
420 Method Failure (Spring Framework) A deprecated response used by the Spring Framework when a method has failed.
422 Unprocessable Entity Request well-formed but unable to process because of semantic errors
423 Locked Resource accessed was locked
424 Failed Dependency Request failed because of the failure of a previous request
426 Upgrade Required Client should switch to Transport Layer Security
440 Login Time-out The client’s session has expired and must log in again.
49 Retry With The server cannot honour the request because the user has not provided the required information.
450 Blocked by Windows Parental Controls (Microsoft) The Microsoft extension code indicated when Windows Parental Controls are turned on and are blocking access to the requested webpage.
451 Redirect Used in Exchange ActiveSync when either a more efficient server is available or the server cannot access the users’ mailbox. The client is expected to re-run the HTTP AutoDiscover operation to find a more appropriate server.
498 Invalid Token (Esri) Returned by ArcGIS for Server. Code 498 indicates an expired or otherwise invalid token.
499 Token Required (Esri) Returned by ArcGIS for Server. Code 499 indicates that a token is required but was not submitted.
500 Internal Server Error Request unsuccessful because of an unexpected condition encountered by the server.
501 Not Implemented Request unsuccessful as the server could not support the functionality needed to fulfil the request.
502 Bad Gateway Server received an invalid response from the upstream server while trying to fulfil the request.
503 Service Unavailable Request unsuccessful to the server being down or overloaded.
504 Gateway Timeout Upstream server failed to send a request in the time allowed by the server.
505 HTTP Version Not Supported Server does not support the HTTP version specified in the request.
509 Bandwidth Limit Exceeded (Apache Web Server/cPanel) The server has exceeded the bandwidth specified by the server administrator; this is often used by shared hosting providers to limit the bandwidth of customers.
530 Site is frozen Used by the Pantheon web platform to indicate a site that has been frozen due to inactivity.
598 (Informal convention) Network read timeout error Used by some HTTP proxies to signal a network read timeout behind the proxy to a client in front of the proxy.

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