Some links for testing referrer stripping manually.
 http://www.google.com/search?q=;
 http://www.google.com/search?q=x&lang=en
 http://www.google.com/search?q=x;lang=en
 http://www.google.com/search?q="
 http://www.google.com/search?q='
 http://www.google.com/search?q=<
 http://www.google.com/search?q=>