function urlIsSameOrigin(requestUrl) {
  var parsed = (isString(requestUrl)) ? urlResolve(requestUrl) : requestUrl;
  return (parsed.protocol === originUrl.protocol &&
          parsed.host === originUrl.host);
}
Parse a request URL and determine whether this is a same-origin request as the application document.

@param {string|object} requestUrl The url of the request as a string that will be resolved
or a parsed URL object.
@returns {boolean} Whether the request is for the same origin as the application document.