Speed up web site using HTTP accelerator - Varnish

Varnish is a state-of-the-art, high-performance web accelerator. It uses the advanced features in Linux 2.6, FreeBSD 6/7 and Solaris 10 to achieve its high performance.

Some of the Varnish features include:
  * A modern design
  * VCL - a very flexible configuration language
  * Load balancing with health checking of backends
  * Partial support for ESI
  * URL rewriting
  * Graceful handling of “dead” back-ends

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