Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

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

Are they using OS proxies for caching or commercial?

share|improve this question
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.

share|improve this answer

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.


share|improve this answer
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 '14 at 12:17

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.