http response 404

The HTTP 404 error is a standard response code used to indicate that a browser was able to communicate with a given server, but the server could not find what was requested. 1 It is often used to indicate that a page is not found, and can be used to redirect users to a different page. 1 Soft 404s are caused by configuration errors, proxy servers, and intentional 404s, and can be used to block requests from certain websites. 1 The HTTP standard defines five classes of responses, and the IANA provides an example of a 200 OK response, which indicates the request was accepted, but not containing any content. 2