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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

 

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

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

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

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

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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