There are always the log showing: file does not exist c:/wamp/www/favicon.ico in apache error_log. I used wampserver, why?
see this http://nfolamp.wordpress.com/2010/06/28/apache-favicon-ico-does-not-exist-yes-its-truly-annoying/ (dead link)
the contents of that link are in the voted answer https://stackoverflow.com/a/11099560/876038