gistfile1.txt

var xhr_request = function (post_url, xsrf_token, ids, start_interval, end_interval, callback){
  var request = { page_ids: ids, start: start_interval, end: end_interval};
  var oReq = new XMLHttpRequest();
  oReq.addEventListener("load", callback);
  oReq.open("POST", post_url);
  oReq.setRequestHeader("Content-Type", "application/json");
  oReq.setRequestHeader("X-CSRF-Token", xsrf_token);
  oReq.send(JSON.stringify(request));
};