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ICP and the Squid web cache
D. Wessels and k. claffy, "ICP and the Squid web cache", IEEE Journal on Selected Areas in Communications, vol. 16, no. 3, pp. 345--57, Mar 1998.
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ICP and the Squid web cache

Duane Wessels2
kc claffy1

CAIDA, San Diego Supercomputer Center, University of California San Diego


University of Colorado at Boulder

We describe the structure and functionality of the Internet Cache Protocol (ICP) and its implementation in the Squid Web Caching software. ICP is a lightweight message format used for communication among Web caches. Caches exchange ICP queries and replies to gather information to use in selecting the most appropriate location from which to retrieve an object.

We present background on the history of ICP, and discuss issues in ICP deployment, efficiency, security, and interaction with other aspects of Web trac behavior. We catalog successes, failures, and lessons learned from using ICP to deploy a global Web cache hierarchy.

Keywords: caching
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