Ez milyen kód? 401 unauthorized rfc 7235

401 Unauthorized

The 401 (Unauthorized) status code indicates that the request has not

been applied because it lacks valid authentication credentials for

the target resource. The server generating a 401 response MUST send

a WWW-Authenticate header field (Section 4.1) containing at least one

challenge applicable to the target resource.

If the request included authentication credentials, then the 401

response indicates that authorization has been refused for those

credentials. The user agent MAY repeat the request with a new or

replaced Authorization header field (Section 4.2). If the 401

response contains the same challenge as the prior response, and the

user agent has already attempted authentication at least once, then

the user agent SHOULD present the enclosed representation to the

user, since it usually contains relevant diagnostic information.