Include Header in Soap Request using CORS

I found a similar post here but I am still not able to get to the solution to fix the issue I am facing.

Here's the jquery snippet of my soap request.

<script type="text/javascript">
    var invocation;
    $(document).ready(function () {

        invocation = new XMLHttpRequest();

        var webserUrl = "http://ift.tt/1CLzqQb";

        var soapRequest = '<?xml version="1.0" encoding="utf-8"?>' +
                            '<soap:Envelope xmlns:xsi="http://ift.tt/ra1lAU" xmlns:xsd="http://ift.tt/tphNwY" xmlns:soap="http://ift.tt/sVJIaE">' +
                            '<soap:Body>' +
                            ' <SmartPhone_Download_TenantInformation xmlns="http://tempuri.org/">' +
                            '<csUser>someuser</csUser>' +
                            '<csPassword>userpassword</csPassword>' +
                            '<csSiteName>someString</csSiteName>' +
                            '<sSearchBy>someString</sSearchBy>' +
                            '</SmartPhone_Download_TenantInformation>' +
                            '</soap:Body>' +
                            '</soap:Envelope>';

        if (invocation) {
            invocation.open('POST', webserUrl, true);
            invocation.setRequestHeader('X-PINGOTHER', 'GetTenant');
            invocation.setRequestHeader('Content-Type', 'text/xml');
            invocation.onreadystatechange = function (data) { handleStateChange(data) };
            invocation.send(soapRequest);
        }
    });

    function handleStateChange(data) {
        switch (invocation.readyState) {
            case 0: // UNINITIALIZED
            case 1: // LOADING
            case 2: // LOADED
            case 3: // INTERACTIVE
                break;
            case 4: // COMPLETED
                //alert(data);
                break;
            default: alert("error");
        }
    }
</script>

It gives me following error on console:

XMLHttpRequest cannot load http://ift.tt/1CLzqQb. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:50099' is therefore not allowed access.

I have defined the header in soapRequest but it still gives me this error. I can't find a solution to this. Any suggestions??