Get same output as sha256sum for an url. Equivalent of `curl -L --compressed $URL | sha256sum -b`

sha256sum.js

async function hash(url) {
	const r = await fetch(url, {
		'credentials': 'omit',
		'method': 'GET',
		'mode': 'cors'
	});

	const h = await crypto.subtle.digest('sha-256', await r.arrayBuffer());

	const a = Array.from(new Uint8Array(h));

	return a.map(b => ('00' + b.toString(16)).slice(-2)).join('');
}