js

const xhr = new XMLHttpRequest();
console.log("0 UNSENT", xhr.statusText);

xhr.open("GET", "/server", true);
console.log("1 OPENED", xhr.statusText);

xhr.onprogress = () => {
  console.log("3 LOADING", xhr.statusText);
};

xhr.onload = () => {
  console.log("4 DONE", xhr.statusText);
};

xhr.send(null);

/**
 * Outputs the following:
 *
 * 0 UNSENT
 * 1 OPENED
 * 3 LOADING OK
 * 4 DONE OK
 */