well you can use, but have to stay with login and pass
your server have a proxy in front him? ( server/proxy/externalWeb)
$.ajax({
url : YourURLConection,
type : "POST",
dataType : "xml",
username : "UserNameProxy",
password : "PassProxy",
contentType : "text/xml; charset=UTF-8",
success : function(data, textStatus, jqXHR) {
if (!data){
alert("The following problem occurred: No data was retrieved by service: ");
}else{
oModel.setXML(jqXHR.responseText);
}
});