HTTP Status Code interpretation

1XX: Information

message	Description
Continue	The server only receives partial requests, but once the server does not reject the request, the client should continue to send the remaining requests.
101 Switching protocols	Server conversion protocol: The server translates the client's request to a different protocol.

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2xx: Success

message	description
OK	request succeeded (followed by the answer document for Get and post requests. The
201 Created	request is created and the new resource is created.
202 Accepted	the request for processing was accepted, but the processing was not completed.
203 non-authoritative Information	The document has returned normally, but some of the answer headers may be incorrect because a copy of the document is being used.
204 No Content	There are no new documents. The browser should continue to display the original document. This status code is useful if the user refreshes the page on a regular basis and the servlet can determine that the user's document is new enough.
205 Reset Content	no new document. But the browser should reset what it displays. Used to force the browser to clear the form input.
206 Partial Content	customer sends a GET request with a range header that the server has completed.

3XX: redirect

message	Description
Multiple Choices	Multiple choices. A list of links. The user can select a link to reach the destination. A maximum of five addresses are allowed.
301 Moved Permanently	The requested page has been moved to a new URL.
302 Found	The requested page has been temporarily transferred to the new URL.
303 See other	The requested page can be found under a different URL.
304 Not Modified	The document was not modified as expected. The client has a buffered document and issues a conditional request (typically providing a if-modified-since header indicating that the customer only wants to update the document than the specified date). The server tells the customer that the original buffered document can continue to be used.
305 Use Proxy	The document requested by the client should be extracted from the proxy server indicated by the location header.
306 Unused	This code is used in the previous version. It is no longer used, but the code is still retained.
307 Temporary Redirect	The requested page has been temporarily moved to a new URL.

4xx: Client Error

message	Description
Request	The server failed to understand the request.
401 Unauthorized	The requested page requires a user name and password.
401.1	Login failed.
401.2	The server configuration caused the login to fail.
401.3	The ACL has not been authorized because of the resource limitation.
401.4	Filter authorization failed.
401.5	ISAPI/CGI application authorization failed.
401.7	Access is denied by the URL authorization policy on the WEB server. This error code is specific to IIS 6.0.
402 Payment Required	This code is not yet available.
403 Forbidden	Access to the requested page is forbidden.
403.1	Execution access is forbidden.
403.2	Read access is forbidden.
403.3	Write access is forbidden.
403.4	Requires SSL.
403.5	Requires SSL 128.
403.6	The IP address is rejected.
403.7	Requires a client certificate.
403.8	Site access is denied.
403.9	Excessive number of users.
403.10	The configuration is not valid.
403.11	Password changes.
403.12	Access to the mapping table is denied.
403.13	The client certificate was revoked.
403.14	Reject directory list.
403.15	Client access permission exceeded.
403.16	The client certificate is not trusted or invalid.
403.17	The client certificate has expired or is not yet valid.
403.18	The requested URL cannot be executed in the current application pool. This error code is specific to IIS 6.0.
403.19	You cannot execute CGI for clients in this application pool. This error code is specific to IIS 6.0.
403.20	Passport Login failed. This error code is specific to IIS 6.0.
404 Not Found	The server was unable to find the requested page.
404.0	(none) – No files or directories found.
404.1	The Web site cannot be accessed on the requested port.
404.2	The WEB service extended lockdown policy blocks this request.
404.3	The MIME mapping policy blocks this request.
405 Method not allowed	The method specified in the request is not allowed.
406 Not acceptable	The server-generated response cannot be accepted by the client.
407 Proxy Authentication Required	The user must first authenticate with a proxy server so that the request is processed.
408 Request Timeout	The request exceeded the server's wait time.
409 Conflict	The request could not be completed because of a conflict.
410 Gone	The requested page is not available.
411 Length Required	"Content-length" is not defined. If there is no such content, the server will not accept the request.
412 Precondition Failed	The prerequisites in the request were evaluated by the server as failed.
413 Request Entity Too Large	The server does not accept the request because the requested entity is too large.
414 Request-url Too Long	The server will not accept the request because the URL is too long. This occurs when the POST request is converted to a GET request with very long query information.
415 Unsupported Media Type	The server will not accept the request because the media type is not supported.
416 Requested Range not satisfiable	The server does not meet the range header specified by the customer in the request.
417 Expectation Failed	Execution failed.
423	The locked error.

5xx: Server error

message	Description
Internal Server Error	The request was not completed. The server encountered unpredictable conditions.
500.12	The application is busy restarting on the WEB server.
500.13	The WEB server is too busy.
500.15	Direct request Global.asa is not allowed.
500.16	The UNC authorization credentials are incorrect. This error code is specific to IIS 6.0.
500.18	The URL authorization store cannot be opened. This error code is specific to IIS 6.0.
500.100	Internal ASP error.
501 Not implemented	The request was not completed. The requested functionality is not supported by the server.
502 Bad Gateway	The request was not completed. The server received an invalid response from the upstream server.
502.1	The CGI application timed out.
502.2	Error in CGI application.
503 Service Unavailable	The request was not completed. The server is temporarily overloaded or in a machine.
504 Gateway Timeout	The gateway timed out.
505 HTTP Version not supported	The server does not support the HTTP protocol version indicated in the request.

HTTP Status Code interpretation