The HTTP 401 Unauthorized client error response status code indicates that a request was not successful because it lacks valid authentication credentials for the requested resource. This status code is sent with an HTTP WWW-Authenticate response header that contains information on the authentication scheme the server expects the client to include to make the request successfully.
A 401 Unauthorized is similar to the 403 Forbidden response, except that a 403 is returned when a request contains valid credentials, but the client does not have permissions to perform a certain action.
The following GET request is made to a URL www.example.com/admin that expects credentials in an Authorization header:
GET /admin HTTP/1.1
Host: example.com
The server responds with a 401 message and a WWW-Authenticate header indicating that the request must be authenticated and that Bearer auth (an access token) is the permitted authentication scheme:
HTTP/1.1 401 Unauthorized
Date: Tue, 02 Jul 2024 12:18:47 GMT
WWW-Authenticate: Bearer
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