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HTTP status codes

1xx – Informational: These status codes indicate a provisional response. The client should be prepared to receive one or more 1xx responses before receiving a regular response.

100 - Continue.
101 - Switching protocols.

2xx – Success: This class of status codes indicates that the server successfully accepted the client request.

200 - OK. The client request has succeeded.
201 - Created.
202 - Accepted.
203 - Non-authoritative information.
204 - No content.
205 - Reset content.
206 - Partial content.
3xx – Redirection: The client browser must take more action to complete the request. For example, the browser may have to request a different page on the server or repeat the request by using a proxy server.

301 - Moved Permanently
302 - Object moved Temporarily
303 - See Other
304 - Not modified.
307 - Temporary redirect.
4xx - Client Error: An error occurs, and the client appears to be at fault. For example, the client may request a page that does not exist, or the client may not provide valid authentication information.

400 - Bad request.
401 - Access denied. IIS defines a number of different 401 errors that indicate a more specific cause of the error. These specific error codes are displayed in the browser but are not displayed in the IIS log:

403 - Forbidden. IIS defines a number of different 403 errors that indicate a more specific cause of the error:

404 - Not found. 404.0 - (None) – File or directory not found.

405 - HTTP verb used to access this page is not allowed (method not allowed.)
406 - Client browser does not accept the MIME type of the requested page.
407 - Proxy authentication required.
412 - Precondition failed.
413 – Request entity too large.
414 - Request-URI too long.
415 – Unsupported media type.
416 – Requested range not satisfiable.
417 – Execution failed.
423 – Locked error.

5xx - Server Error: The server cannot complete the request because it encounters an error.

500 - Internal server error.

501 - Header values specify a configuration that is not implemented.
502 - Web server received an invalid response while acting as a gateway or proxy.

503 - Service unavailable. This error code is specific to IIS 6.0.
504 - Gateway timeout.
505 - HTTP version not supported.


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