Cache Array Routing Protocol

The Cache Array Routing Protocol is used in load-balancing HTTP requests across multiple proxy cache servers. It works by generating a hash for each URL requested. A different hash is generated for each URL and by splitting the hash namespace into equal parts the overall number of requests can be distributed to multiple servers.
Implementations include Apache [Traffic Server], Squid (software) and the Microsoft [Internet Security and Acceleration Server] as well as F5 Networks [BIG-IP devices].