loader.js

function encodeData(data) {
	var result = [];

	forEach(data, function(value, key) {
		if (isArray(value)) {
			forEach(value, function(url) {
				result.push(encodeURIComponent(key) + '[]=' + encodeURIComponent(url));
			});
		} else {
			result.push(encodeURIComponent(key) + '=' + encodeURIComponent(value));
		}
	});

	return result.join('&').replace(/%20/g, '+');
}