In InAppBrowser test, there are tests to load http://www.google.com which is listed in whitelist. I saw this page wasn't loaded on CordovaWebView with popup message saying that "Unexpected: got multiple loadstart events"..
I think the reason is I'm working in Australia and google usually redirects the request to sender's country which could invoke multiple loadstart events. Adding that, Google Australia has domain google.co.au which are actually not hitting the whitelisted URL google.com and the test eventually fails to open the redirected URL.
I don't mind the multiple loadstart error so much but I wish the whitelisted URL should be considered to be used by developers over the world.
Note that at least United Kingdom and Japan have domain formats looking like *.co.uk or *.co.jp.