This test:

	$.ajax(tabulatabsServerPath + 'hello/hello_secure.json', {
		type: 'GET',
		username: 'Tester',
		password: 'greets',
		success: function(r) {
			equal(r.greeted, 'Hello Tester!', 'authentification is working');
			start();
		}
	});

always returns 401 not authorized in the latest Chrome Betas/Chrome Canries

I could fix it by manually setting the Authorization request header in the beforeSend callback:

	$.ajax(tabulatabsServerPath + 'hello/hello_secure.json', {
		type: 'GET',
		username: 'Tester',
		password: 'greets',
		beforeSend: function(jqXHR, settings) {
			if (settings.username) {
				jqXHR.setRequestHeader('Authorization', 'Basic ' + base64_encode(settings.username + ':' + settings.password) + '==');
			}
		},
		success: function(r) {
			equal(r.greeted, 'Hello Tester!', 'authentification is working');
			start();
		}
	});