HAproxy is a high-performance and highly-robust TCP and HTTP load balancer which provides cookie-based persistence, content-based switching, 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 20,000 hits per second and surpasses GigaEthernet on modern hardware, even with tens of thousands of simultaneous connections.
License: GNU General Public License (GPL)
Changes:
Many new features, including stats updates (HTTP, UNIX, and SNMP), enhancements to server checks such as tracking and dynamic intervals, the addition of the leastconn load-balancing algorithm and POST parameter analysis, a fully transparent mode on Linux, better handling of connection failures (dead server avoidance and turn-around state), support for inter-site off-loading through redirects, updates to the build process, and large documentation updates.
