ci中 chrome对favicon.ico请求，导致log报错 解决方法
chrome浏览器会自动对favicon.ico进行请求,所以当没有为网站添加 favicon.ico 时会出现404的页面错误
在实际开发过程中,CI框架 打开 ERROR log,
会一直显示ERROR - 2011-10-13 03:43:57 --> 404 Page Not Found --> favicon.ico
解决方法如下
可以修改CI,exception 的show_404方法屏蔽
if ($log_error && $page != 'favicon.ico')
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