Error 401--Unauthorized
From RFC 2068
Hypertext Tra fer Protocol -- HTTP/1.1
10.4.2 401 Unauthorized
The request requires user authentication. The re o e MUST include a WWW-Authenticate header field (section 14.46) containing a challenge a licable to the requested resource. The client MAY repeat the request with a suitable Authorization header field (section 14.8). If the request already included Authorization credentials, then the 401 re o e indicates that authorization has been refused for those credentials. If the 401 re o e contai the same challenge as the prior re o e, and the user agent has already attempted authentication at least once, then the user SHOULD be presented the entity that was given in the re o e, since that entity MAY include relevant diagnostic information. HTTP acce authentication is explained in section 11. Error 401--Unauthorized
From RFC 2068
Hypertext Tra fer Protocol -- HTTP/1.1
10.4.2 401 Unauthorized
The request requires user authentication. The re o e MUST include a WWW-Authenticate header field (section 14.46) containing a challenge a licable to the requested resource. The client MAY repeat the request with a suitable Authorization header field (section 14.8). If the request already included Authorization credentials, then the 401 re o e indicates that authorization has been refused for those credentials. If the 401 re o e contai the same challenge as the prior re o e, and the user agent has already attempted authentication at least once, then the user SHOULD be presented the entity that was given in the re o e, since that entity MAY include relevant diagnostic information. HTTP acce authentication is explained in section 11.