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HTTP Status and Error Codes Explained

The following is a list of HTTP response status codes and standard associated phrases, intended to give a short textual description of the status.

1xx Informational
2xx Success
3xx Redirection
4xx Client Error
5xx Server Error

1xx Informational
Request received, continuing process.
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Code Status Explanation
100 Continue The request has been completed and the rest of the process can continue.
101 Switching Protocols When requesting a page, a browser might receive a statis code of 101, followed by an "Upgrade" header showing that the server is changing to a different version of HTTP.
2xx Success
The action was successfully received, understood, and accepted.
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Code Status Explanation
200 OK Standard response for HTTP successful requests.
201 Created When new pages are created by posted form data or by a CGI process, this is confirmation that it worked.
202 Accepted The client's request was accepted, though not yet processed.
203 Non-Authorative Information The information contained in the entity header is not from the original site, but from a third party server.
204 No Content If you click a link which has no target URL, this response is elicited by the server. It's silent and doesn't warn the user about anything.
205 Reset Content This allows the server to reset any content returned by a CGI.
206 Partial Content The requested file wasn't downloaded entirely. This is returned when the user presses the stop button before a page is loaded, for example.
3xx Redirection
The client must take additional action to complete the request.
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Code Status Explanation
300 Multiple Choices The requested address refers to more than one file. Depending on how the server is configured, you get an error or a choice of which page you want.
301 Moved Permanently If the server is set up properly it will automatically redirect the reader to the new location of the file.
302 Moved Temporarily Page has been moved temporarily, and the new URL is available. You should be sent there by the server.
303 See Other This is a "see other" SRC. Data is somewhere else and the GET method is used to retrieve it.
304 Not Modified If the request header includes an 'if modified since' parameter, this code will be returned if the file has not changed since that date. Search engine robots may generate a lot of these.
305 Use Proxy The recipient is expected to repeat the request via the proxy.
4xx Client Error
The client failed to provide an valid request.
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Code Status Explanation
400 Bad Request There is a syntax error in the request, and it is denied.
401 Authorization Required The request header did not contain the necessary authentication codes, and the client is denied access.
402 Payment Required Payment is required. This code is not yet in operation.
403 Forbidden The client is not allowed to see a certain file. This is also returned at times when the server doesn't want any more visitors.
404 Not Found The requested file was not found on the server. Possibly because it was deleted, or never existed before. Often caused by misspellings of URLs.
405 Method Not Allowed The method you are using to access the file is not allowed.
406 Not Acceptable The requested file exists but cannot be used as the client system doesn't understand the format the file is configured for.
407 Proxy Authentication Required The request must be authorised before it can take place.
408 Request Timed Out The server took longer than its allowed time to process the request. Often caused by heavy net traffic.
409 Conflicting Request Too many concurrent requests for a single file.
410 Gone The file used to be in this position, but is there no longer.
411 Content Length Required The request is missing its Content-Length header.
412 Precondition Failed A certain configuration is required for this file to be delivered, but the client has not set this up.
413 Request Entity Too Long The requested file was too big to process.
414 Request URI Too Long The address you entered was overly long for the server.
415 Unsupported Media Type The filetype of the request is unsupported.
5xx Server Error
The server failed to fulfill an apparently valid request.
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Code Status Explanation
500 Internal Server Error Nasty response that is usually caused by a problem in your Perl code when a CGI program is run.
501 Not Implemented The request cannot be carried out by the server.
502 Bad Gateway The server you're trying to reach is sending back errors.
503 Service Unavailable The service or file that is being requested is not currently available.
504 Gateway Timeout The gateway has timed out. Like the 408 timeout error, but this one occurs at the gateway of the server.
505 HTTP Version Not Supported The HTTP protocol you are asking for is not supported.

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