HAproxy is a high-performance and highly-robust TCP/HTTP load balancer which provides cookie-based persistence, advanced traffic regulation with surge protection, automatic failover, run-time regex-based header control, Web-based reporting, advanced logging to help trouble-shooting buggy applications and/or networks, and a few other features. Its own event-driven state machine achieves 10,000 hits per second on modern hardware, even with tens of thousands of simultaneous connections. License: GNU General Public License (GPL) Changes: The configuration error detection methods have been highly improved, and many incorrect configurations will now lead to a warning or an error. The time in the logs was wrong on OpenBSD/sparc. TCP proxies split into frontends and backends would silently fail; this is now fixed. Users who experience configuration troubles should upgrade.

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