test

var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function(a) {
    if (this.readyState == 4 && this.status == 200) {
       console.log(a);
    }
};
xhttp.open("OPTIONS", "filename", true);
XMLHttpRequest.setRequestHeader("Access-Control-Request-Method", "PUT");
xhttp.send(json);