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var http = new XMLHttpRequest();
var url = "Url Path";
var params ='Your parameters';
http.open("GET", url, true);

//Send the proper header information along with the request
http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");

http.onreadystatechange = function() {//Call a function when the state changes.
    if(http.readyState == 4 && http.status == 200) {
        console.log(http.responseText);
    }
http.send(params);
}