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:
Several timeouts were not correctly updated on some rare occasions. A possible segfault when using "url_param check_post" has been fixed. regparm is disabled on gcc versions < 3. "use_backend" would not correctly consider "unless". This last change should probably be the real reason to upgrade, as check_post is rarely used.
More...