Error Operation Aborted

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Javascript

Visual-Studio

Ajax

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Hi All,
I have the following script

function getJson(url) {
    var response;
    $.ajax({
        type: "POST",
        url: url,
        dataType: "jsonp",
        success: function (data) {
            response = data;
        }
    });
return response;
}

I am able to get the response successfully when I run this script in IE debugger but the same code gives "Operation Aborted" error in statusText when I am using it in a sharepoint-hosted app. Can anyone please suggest what I am doing wrong? For reference "http://rate-exchange.appspot.com/currency?from=USD&to=PKR" can be used as url.

Thanks,
Zafar