Request (GET) wrapped numa promise

request.js

  request(url){

		return new Promise((resolve, reject) => {
			
			let xhr = new XMLHttpRequest();

			xhr.open('GET', url);

			xhr.onload = () => {
				
				if(xhr.status >= 200 && xhr.status < 300){
					resolve(xhr.response);
				}else{
					reject({
						status: xhr.status,
						statusText: xhr.statusText,
						response: xhr.response
					});
				}
			}

			xhr.onerror = () => reject(xhr.response);

			xhr.send();
			
		});
}