401 Unauthorized client error status response
code indicates that the request has not been applied because it lacks valid
authentication credentials for the target resource.
This status is sent with a
WWW-Authenticate header that contains
information on how to authorize correctly.
This status is similar to
403, but in this case, authentication is
HTTP/1.1 401 Unauthorized Date: Wed, 21 Oct 2015 07:28:00 GMT WWW-Authenticate: Basic realm="Access to staging site"
|RFC 7235, section 3.1: 401 Unauthorized||HTTP/1.1: Authentication|
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