What webserver is a site running ?

I had chanced upon a site which gave me the name of the webserver running on any site once i typed in the URl of that site. but i no longer remember the site name. any suggestion ?
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The site is called http://www.netcraft.com/whats/ ....To find out what theyre using as a web server add a :80 to the end of the url...so...www.apple.com:80 will tell you what theyre using as a webserver.
perl -MLWP::Simple -e 'print ((head shift)[2])' http://experts-exchange.com
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