dzięki, nietety, to co jest zwracane to :
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head><title>
Untitled Page
</title></head>
<body>
<form name="form1" METHOD="post" ACTION="ProxyXML.aspx" id="form1">
<input TYPE="hidden" name="__VIEWSTATE" id="__VIEWSTATE" VALUE="/wEPDwUJNzgzNDMwNTMzZGQBUH7vHcVQ0/SwlDFQ+spuGNUHIrC5swrkByALElGOsA==" />
<div>
</div>
</form>
</body>
</html>
czyli strona z logowaniem.