HTTP Requests in JavaScript: XMLHttpRequest & Fetch API

You can make an HTTP request in JavaScript using the built-in 'XMLHttpRequest' object or the newer 'fetch()' API. Here's an example of each:

Using XMLHttpRequest:

var xhr = new XMLHttpRequest();
xhr.open('GET', 'https://example.com/api/data', true);
xhr.onreadystatechange = function() {
  if (xhr.readyState === 4 && xhr.status === 200) {
    console.log(xhr.responseText);
  }
};
xhr.send();

Using fetch():

fetch('https://example.com/api/data')
  .then(response => response.json())
  .then(data => console.log(data))
  .catch(error => console.error(error));

Both of these examples make a GET request to 'https://example.com/api/data'. The XMLHttpRequest example sets up an event listener to handle the response, while the fetch() example uses promises to handle the response.