{
string response = String.Format ("{0}:{1}:", HA1 (username, password), Nonce);
if (QOP != null)
- response += String.Format ("{0}:{1}:{2}:", _nc.ToString ("x8"), CNonce, QOP);
+ response += String.Format ("{0}:{1}:{2}:", _nc.ToString ("X8"), CNonce, QOP);
response += HA2 (webRequest);
return HashToHexString (response);
}