HTTP Status Code 499 – Client Closed Request

Data Hiding Data hiding is a protection mechanism. Data hiding is the simple concept of hiding data in a place where it is not easily discovered. This concept is extensively used in security controls and in programming. Example An example of data hiding in an organization is the use of classification labels. A database can…

The server, while acting as a gateway or proxy, did not receive a timely response from an upstream server it needed to access in order to complete the request.

The target resource has more than one representation, each with its own more specific identifier, and information about the alternatives is being provided so that the user (or user agent) can select a preferred representation by redirecting its request to one or more of those identifiers. In other words, the server desires that the user…

The server refuses to accept the request without a defined Content-Length. The client MAY repeat the request if it adds a valid Content-Length header field containing the length of the message body in the request message.

The method received in the request-line is known by the origin server but not supported by the target resource. The origin server MUST generate an Allow header field in a 405 response containing a list of the target resource’s currently supported methods. A 405 response is cacheable by default; i.e., unless otherwise indicated by the…

The request could not be completed due to a conflict with the current state of the target resource. This code is used in situations where the user might be able to resolve the conflict and resubmit the request. The server SHOULD generate a payload that includes enough information for a user to recognize the source…