Status Code/HTTP Code

In statistics, the status code (also called HTTP code) is used to determine the result of a request or to indicate an error to the client. The first digit of the status code is used to specify one of five response categories.

Success (2XX)Success of the request. This class indicates that the client’s request has been received, understood and accepted successfully.
Redirects (3XX)Redirection. This class indicates that another action must be done to complete the request.
4XXWeb client error. This class indicates that the request contains bad syntax or cannot be completed.
5XXServer error. This class indicates a server or application server error in executing the request.