HAProxy提供高可用性、负载均衡以及基于TCP和HTTP应用的代理，支持虚拟主机， 它是免费、快速并且可靠的一种解决方案。HAProxy特别适用于那些负载特大的web站点， 这些站点通常又需要会话保持或七层处理。HAProxy运行在当前的硬件上，完全可以支持数以万计的并发连接。并且它的运行模式使得它可以很简单安全的整 合进您当前的架构中， 同时可以保护你的web服务器不被暴露到网络上。
2012年8月15日发布1.4.22.上一个版本是2012/05/21的1.4.21.虽然主页上还未放出下载及声明，但下载目录里已有下载 改进：
2012/08/14 : 1.4.22
- BUG/MEDIUM: option forwardfor if-none doesn't work with some configurations
- MINOR: balance uri: added 'whole' parameter to include query string in hash calculation
- DOC: specify the default value for maxconn in the context of a proxy
- BUG/MINOR: checks: expire on timeout.check if smaller than timeout.connect
- REORG/MINOR: use dedicated proxy flags for the cookie handling
- BUG/MINOR: config: do not report twice the incompatibility between cookie and non-http
- MINOR: http: add support for "httponly" and "secure" cookie attributes
- MEDIUM: stats: add support for soft stop/soft start in the admin interface
- BUILD: add support for linux kernels >= 2.6.28
- MINOR: contrib/iprange: add a network IP range to mask converter
- BUILD: add an AIX 5.2 (and later) target.
- MINOR: halog: use the more recent dual-mode fgets2 implementation
- BUG/MEDIUM: ebtree: ebmb_insert() must not call cmp_bits on full-length matches
- CLEANUP: halog: make clean should also remove .o files (cherry picked from commit 8ad4193100aafa19f04929670371bf823dbe11d0)
- OPTIM: halog: make use of memchr() on platforms which provide a fast one
- OPTIM: halog: improve cold-cache behaviour when loading a file
- [MINOR] config: make it possible to specify a cookie even without a server
- MINOR: config: tolerate server "cookie" setting in non-HTTP mode
- BUG/MINOR: tarpit: fix condition to return the HTTP 500 message
下载：http://haproxy.1wt.eu/download/1.4/src/haproxy-1.4.22.tar.gz
主页：http://haproxy.1wt.eu/
下载：http://haproxy.1wt.eu/download/1.4/
来自:开源中国社区
