HTTP/1.1 401 Unauthorized
Content-Length: 0
WWW-Authenticate: Digest realm="IgdAuthentication", domain="/", nonce="Y2FlY2ZlZDg6ZGQ2ODQxMzA6MmVlZWNiZTg=", qop="auth", algorithm=MD5, opaque="5ccc09c403ebaf9f0171e9517f40e41" 

HTTP/1.1 401 Unauthorized
Content-Length: 0
WWW-Authenticate: Digest realm="IgdAuthentication", domain="/", nonce="YTI2OTY4MWI6Mzc1NzU2NmU6OGQwZThjMDM=", qop="auth", algorithm=MD5, opaque="5ccc09c403ebaf9f0171e9517f40e41"