HAProxy与varnish
Even if HAProxy can do TCP proxying, it is often used in front of web application, exactly where we find Varnish http://s0.wp.com/wp-includes/images/smilies/icon_smile.gif?m=1129645325g .They complete very well together: Varnish will make the website faster by offloading static object delivery to itself, while HAProxy can ensure a smooth load-balancing with smart persistence and DDOS mitigation.
Basically, HAProxy and Varnish completes very well, despite being “competitors” on a few features, each on them has its own domain of expertise where it performs very well:HAProxy is a reverse-proxy Load-Balancer and Varnish is a Reverse-proxy cache.
reference：http://blog.exceliance.fr/2012/07/04/haproxy-and-varnish-comparison/
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