HTTP/1.1 401 Unauthorized
Content-Length: 0
WWW-Authenticate: Digest realm="IgdAuthentication", domain="/", nonce="ZDU3YjNkYzM6NWYwMzIyYzI6MzY5YjVhNjQ=", qop="auth", algorithm=MD5, opaque="5ccc09c403ebaf9f0171e9517f40e41"