If Google S2 favicon service can't find a favicon of a website, it returns a default image. I want to know that the favicon was not found so I can show some other default image (on my server), or switch to another favicon service (like g.etfv.co). I know Google S2 isn't exactly nice.
Final question : How to detect favicon not found with Google S2, or should I switch to another favicon provider?
Thanks in advance!