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function postJSON(url, data, callback) {

var request = new XMLHttpRequest();

request.open("POST", url); // POST to the specified url

request.onreadystatechange = function() { // Simple event handler

if (request.readyState === 4 && callback) // When response is complete

callback(request); // call the callback.

};

request.setRequestHeader("Content-Type", "application/json");

request.send(JSON.stringify(data));

}