lib/utils.js
function (entry) {
    var parsed = url.parse(entry, true, true);
    return !parsed.protocol || values.FETCH_PROTOCOLS.indexOf(parsed.protocol) !== -1;
  }
function (entry) {
    var parsed = url.parse(entry, true, true);
    return !parsed.protocol || values.FETCH_PROTOCOLS.indexOf(parsed.protocol) !== -1;
  }
intended to be used with `Array#filter()`
@param {string} entry from AppCache manifest
@returns {boolean} include entry?