Cache Array Routing Protocol

HTTP
Persistence Compression HTTPS
Request methods
OPTIONS GET HEAD POST PUT DELETE TRACE CONNECT PATCH
Header fields
Cookie ETag Location HTTP referer DNT X-Forwarded-For
Status codes
301 Moved Permanently 302 Found 303 See Other 403 Forbidden 404 Not Found 451 Unavailable For Legal Reasons

This article is about CARP for load-balancing HTTP requests. For CARP for sharing IP addresses, see Common Address Redundancy Protocol.

The Cache Array Routing Protocol (CARP) 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 (or unequal parts if uneven load is intended) the overall number of requests can be distributed to multiple servers.

Implementations include Microsoft Internet Security and Acceleration Server and the Squid (software).

External links

The Cache Array Routing Protocol v1.0 draft

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