const xhr = new XMLHttpRequest(); xhr.open('GET', 'https://your-backend-domain.com/api/endpoint', true); // true for asynchronous xhr.withCredentials = true; xhr.onload = function() { if (xhr.status >= 200 && xhr.status < 400) { // ... handle the response } else { // ... handle the error } }; xhr.onerror = function() { // ... handle the error }; xhr.send();