401 errors can happen within any browser so the message appearing may differ.įor example, in Chrome or Edge, you’ll likely see a paper icon along with a simple message telling you that the page in question isn’t working.
A 401 error, in particular, happens when your browser denies you access to the page you’re trying to visit.Īs a result, instead of loading the web page, the browser will load an error message. HTTP 400 status codes are encountered when there is a problem making a request. The server generating a 401 response MUST send a WWW-Authenticate header field containing at least one challenge applicable to the target resource. The 401 (Unauthorized) status code indicates that the request has not been applied because it lacks valid authentication credentials for the target resource.
The Internet Engineering Task Force (IETF) defines the error 401 Unauthorized as:
