gistfile1.txt

function parseQuery(json) {
        var q = "";
        var first = true;
        for (var key in json) {
            if(json[key]=="" || json[key]==null) continue;
            
            if (first) {
                first = false;
                q += (key + "=" + json[key]);
            } else {
                q += ("&" + key + "=" + json[key]);
            }
        }
        return q;
    }

function httpRequest(method, url, data) {
        var xhr = new XMLHttpRequest();

        //ready
        xhr.onreadystatechange = function() {
            if (xhr.readyState == 4) {
                if (xhr.status == 200 || xhr.status == 201) {
                    var responseText = xhr.responseText;
                    var responseObj = JSON.parse(responseText);
                    
                    //refresh model
                    clear();
                    insertList(responseObj.data);
                    
                    requestFinished(responseObj.success, method, responseObj.data);
                } else {
                    requestFinished(false, method, "request failed (" + xhr.statusText + ")");
                }
            }
        }

        //open
        console.log(url);
        xhr.open(method, url);

        //send
        if (data) {
            xhr.setRequestHeader("Content-Type", "application/json;charset=UTF-8");
            xhr.send(parseQuery(data))
        } else {
            xhr.send();
        }
    }

httpRequest("PUT", "https://xxx.xxx.com", {"done":1});