nion's blog

Dear Opera developers...
even I find it hard to believe that your fraud protection is of a real use for anyond (besides the technical implementation: doing an http request for each unvisited site to http://sitecheck2.opera.com/?host=HOST really sucks) it might help some people.

BUT why on earth are you doing this for private ip ranges??? FAIL!

UPDATE: the documentation states that this is not done, however I only recognized this because I saw that it is exactly doing that in a packet dump and I can reproduce this:
192.168.1.212 - - [14/Sep/2008:21:22:09 +0200] "GET http://sitecheck2.opera.com/?host=192.168.1.4&hdn=1jefsNeoBNollcGHqAYxxA== HTTP/1.1" - - "-" "Opera/9.50 (X11; Linux i686; U; en)"

So either urlsnarf is buggy here (which I don't believe as the request should never go through a socket) or opera has a bug.