Just enough javascript to do a GET request.

simple-httprequest.js

var endpoint = 'https://jsonplaceholder.typicode.com/users';

// 1. https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest
var request = new XMLHttpRequest();
request.addEventListener('load', function() {
  console.log(this.responseText);
})
request.open('GET', endpoint);
request.send();


// 2.
var request = new XMLHttpRequest();
request.open('GET', endpoint, true)
request.send(null)

request.onreadystatechange = function() {
  if (request.readyState == 4)
    console.log(request.responseText);
};