How to make ajax calls to IBM Jazz (RTC) info ... with authentication ?

Some background ... What works

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1)   https://csnext.ibm.com:8002/jazz/oslc/workitems/11707

If i point my browser as the above url ... it first puts up a login screen , and after I enter my intranet userid and password  it successfully displays the requested REST info for that RTC workitem. .. Good !

So, now  I'd like to get  the same info using  an ajax call from a webpage on another server.

First step is to  create a proxy on our webserver so gets around ajax x-domain limitation.

2) https://rbdev.ibm.com/virtual/intranet/csnext.ibm.com:8002/jazz/oslc/workitems/11707

And then I  have a webpage on this same webserver that makes an ajax call to url 2) above using the "get_url(..)" function listed below.

However, IT FAILS... trying to display the Jazz username/password screen ... it instead just displays "Loading..."  

I even tried manually including my username/password as part of the ajax call, hoping this might bypass the Jazz authentication login screen ... but no change.

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What am I missing ? ... How does one successfully make xdomain ajax calls to pull RTC info from a IBM Jazz server that requires authentication ?

I assume this must be a common practice. 

Any suggestions / workarounds much appreciated !  Thanks !

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	function get_url( urlx ) {
 
		var username = "deanw@ca.ibm.com";
		var password = "xxxxxxxxx";
 
		var txt = "";

    	$.ajax({
      		url: urlx,
      		type: "GET",
      		dataType: "text",
	  		async: false,
 
    		beforeSend: function (xhr){ 
        		xhr.setRequestHeader('Authorization', make_base_auth(username, password)); 
    		},
      		
			success: function(data){
				txt = data;
	 		},	
      		error: function(msg){
        
      		}    
    	});
 
		return txt;
	}