How can I make an AJAX call without jQuery?

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I know this is a fairly old question, but there is now a nicer API available natively in newer browsers. The fetch() method allow you to make web requests.
For example, to request some json from /get-data:

var opts = {
  method: 'GET',      
  headers: {}
};
fetch('/get-data', opts).then(function (response) {
  return response.json();
})
.then(function (body) {
  //doSomething with body;
});

See here for more details.

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