==HTTP Response Status Code Reference== For use with ValExtLinks script (http://wiki.oni2.net/ValExtLinks). Only codes understood by ValExtLinks are listed here. Source: https://en.wikipedia.org/wiki/List_of_HTTP_status_codes --2xx: Success-- This class of status codes indicates the action requested by the client was received, understood, accepted, and processed successfully. 200 OK Standard response for successful HTTP requests. --3xx: Redirection-- This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. 301 Moved Permanently This and all future requests should be directed to the given URI. 302 Found This is an example of industry practice contradicting the standard. The HTTP/1.0 specification required the client to perform a temporary redirect (the original describing phrase was "Moved Temporarily"), but popular browsers implemented 302 with the functionality of a 303 See Other. Therefore, HTTP/1.1 added status codes 303 and 307 to distinguish between the two behaviors. However, some Web applications and frameworks use the 302 status code as if it were the 303. 303 See Other The response to the request can be found under another URI using a GET method. 307 Temporary Redirect The request should be repeated with another URI; however, future requests should still use the original URI. 308 Permanent Redirect The request and all future requests should be repeated using another URI. --4xx: Client Errors-- The 4xx class of status codes is intended for situations in which the client seems to have erred. 401 Unauthorized Similar to 403 Forbidden, but specifically for use when authentication is required and has failed or has not yet been provided. 403 Forbidden The request was valid, but the server is refusing action. The user might not have the necessary permissions for a resource. 404 Not Found The requested resource could not be found but may be available in the future. Subsequent requests by the client are permissible. 405 Method Not Allowed A request method is not supported for the requested resource; for example, a GET request on a form that requires data to be presented via POST, or a PUT request on a read-only resource. 406 Not Acceptable The requested resource is capable of generating only content not acceptable according to the Accept headers sent in the request. 410 Gone Indicates that the resource requested is no longer available and will not be available again. This should be used when a resource has been intentionally removed and the resource should be purged. Upon receiving a 410 status code, the client should not request the resource in the future. --5xx: Server Errors-- The server failed to fulfill an apparently valid request. 500 Internal Server Error A generic error message, given when an unexpected condition was encountered and no more specific message is suitable. 501 Not Implemented The server either does not recognize the request method, or it lacks the ability to fulfill the request. Usually this implies future availability (e.g., a new feature of a web-service API). 503 Service Unavailable The server is currently unavailable (because it is overloaded or down for maintenance). Generally, this is a temporary state.