function sendLog(data, callback) {
    var url = "http://172.19.187.187/kafka"
    var httpRequest = new XMLHttpRequest();
    httpRequest.open("POST",  url, true)
    httpRequest.setRequestHeader("Content-type","application/json");
    httpRequest.send(JSON.stringify(data));
    httpRequest.onreadystatechange = function() {
        if (httpRequest.readyState == 4 && httpRequest.status == 204) {
            if(!callback || typeof callback == 'undefined' || callback == undefined) {
                return;
            }
            callback()
        }
    }
}