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is there any information about which caching proxy the famous CDNs are using?

are they using OS proxies for caching or commercial?

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up vote 2 down vote accepted

Some use lighttpd or nginx. Some use squid or varnish.

Get something like headerspy for Firefox, surf a few and check the headers that are returned.

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Akamai uses a modified version of Squid. See http://research.microsoft.com/en-us/um/people/ratul/akamai.html

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