GET /client/update.aspx?host=test.myfreeip.info HTTP/1.1
User-Agent: DDNS-Enterprise-Client-v2.0
Host: www.myfreeip.me

HTTP/1.1 401 Not Authorized
Date: Sun, 25 Sep 2011 07:38:31 GMT
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET
X-AspNet-Version: 2.0.50727
Pragma: no-cache
WWW-Authenticate: Basic realm=DDNS
Cache-Control: no-cache
Pragma: no-cache
Expires: -1
Content-Length: 0

GET /client/update.aspx?host=test.myfreeip.info HTTP/1.1
User-Agent: DDNS-Enterprise-Client-v2.0
Authorization: Basic a12heXVsaWFuasdfgWFpbC5jb206aHlsODAzMQ==
Host: www.myfreeip.me

HTTP/1.1 200 OK
Date: Sun, 25 Sep 2011 07:38:32 GMT
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET
X-AspNet-Version: 2.0.50727
Pragma: no-cache
Cache-Control: no-cache
Pragma: no-cache
Expires: -1
Content-Type: text/html; charset=utf-8
Content-Length: 2

ok