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Is there any information about which caching proxies the famous CDNs are using?

Are they using OS proxies for caching or commercial?

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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.

Akamai caches (courtesy Neal Cardwell)

The akamai machines at the edge are PCs running Linux and a slightly modified version of the squid cache. They are doing on-demand caching rather than push-based replication.

Source: http://research.microsoft.com/en-us/um/people/ratul/akamai.html

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Also, if you look at the Akamai debug response headers in the x-cache header you will see returns such as TCP_MEM_HIT which is a response code for the Squid Proxy Log Format. –  Elijah Lynn Jul 29 at 12:17

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