CoDeeN is a proxy server system created at Princeton University in 2003 and deployed for general use on PlanetLab.

It operates as per the following: What this means for normal users is that if they use this and a server is slow, however the content is cached on the system, then (after the first upload) requests to that file will be fast.

It also means that the request will not be satisfied by the original server, equivalent to free bandwidth.

The system's speed is also subject to the constraint of number of participating proxies.

This allows for more sharing of disk space among proxies, and for higher fault tolerance.