JavaScript的“Content Range”响应头不可见[重复]

const URL = 'https://www.tophtml.com/snl/15.mp3';
window.addEventListener('load', function() {
	const button_load		= document.querySelector('.button_load');
	button_load.addEventListener('click', async function() {
		let url = URL + '?nocache='+(new Date()).getTime();
		let arrayBuffer = await fetchData(url, 501, 510);
		console.log('This is the response itself:');
		console.log(arrayBuffer);
	});
});
function fetchData(url, byte_from, byte_to) {
	return new Promise((resolve, reject) => {
		var request = new XMLHttpRequest();
		request.responseType = 'arraybuffer';
		request.open('GET', url, true);
		request.setRequestHeader("Range", "bytes=" + byte_from + "-" + byte_to);
		request.onload = function() {
			resolve(request.response);
		}
		request.onreadystatechange = function() {
			if (this.readyState == this.HEADERS_RECEIVED) {
				console.log('These are the "Response Headers" visible to JavaScript:');
				console.log(request.getAllResponseHeaders());
			}
		}		
		request.send();
	});
}

<button class="button_load">Load</button>