ttp://andrewu.co.uk/webtech/archive/?bluecoat_precaching_proxy_problem
Note: you can tell if a user is behind a BlueCoat proxy as the server adds a HTTP_X_BLUECOAT_VIA header to the page request,
you'll then have a chunk of page requests from the same IP address in your server logs all made within typically 1 second of the original page request.

ttp://www.bluecoat.com/products/
Proxy Appliances from Blue Coat

先生、これですか！？よくわかりません。！(AA略
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