来源：xiazhengxin
Varnish cache，或称Varnish，是一套高效能的反向网站快取服务器（reverse proxy server）。
Varnish目前被用在挪威最大的报社Verdens Gang上。
下载：http://www.varnish-software.com/sites/default/files/varnish-2.1.4.tar.gz
Changes:
A bug in the binary heap layout caused inflated object counts, this has been fixed.
Much more comprehensive documentation.
A DNS director that uses DNS lookups for choosing which backend to route requests to has been added.
The client director now uses the variable client.identity for choosing which backend to send a given request to.
String representation of now, making it easier to add Expires headers
Portability fixes for Solaris.
Various bug fixes.
