set custom headers with jquery $.ajax

set custom headers with jquery $.ajax

$.ajax({
        beforeSend: function(xhrObj){
                xhrObj.setRequestHeader("Content-Type","application/json");
                xhrObj.setRequestHeader("Accept","application/json");
        }
        type: "POST",
        url: "/someurl",
        processData: false,
        data: jsonData,
        dataType: "json",
        success: function(json){
                do something...
        }
});