XMLHttpRequest: send() method

send()
send(body)

const xhr = new XMLHttpRequest();
xhr.open("GET", "/server", true);

xhr.onload = () => {
  // Request finished. Do processing here.
};

xhr.send(null);
// xhr.send('string');
// xhr.send(new Blob());
// xhr.send(new Int8Array());
// xhr.send(document);

const xhr = new XMLHttpRequest();
xhr.open("POST", "/server", true);

// Send the proper header information along with the request
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

xhr.onreadystatechange = () => {
  // Call a function when the state changes.
  if (xhr.readyState === XMLHttpRequest.DONE && xhr.status === 200) {
    // Request finished. Do processing here.
  }
};
xhr.send("foo=bar&lorem=ipsum");
// xhr.send(new Int8Array());
// xhr.send(document);