I have this running but it is returning "Unknown" for these http_user_agent values:
1 "Mozilla/5.0+(compatible;+MSIE+9.0;+Windows+NT+6.1;+Trident/5.0)"
2 "Mozilla/5.0+(Windows+NT+6.1;+WOW64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/31.0.1650.63+Safari/537.36"
3 "Mozilla/5.0+(X11;+U;+Linux+i686)+Web-Security/1.0(it's+for+a+research+study,if+you+have+questions,plz+contact+me+liangw@cs.wisc.edu)"
4 "Mozilla/5.0+(Windows;+U;+Windows+NT+5.1;+de;+rv:1.9)+Gecko/2008052906+Firefox/3.0"
Do you know why?
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