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On the backend side, QUIC MUX may be started preemptively before the ALPN negotiation. This is useful notably for 0-RTT implementation. However, this was a source of crashes. ALPN was expected to be retrieved from the server cache, however QUIC MUX still used the ALPN from the transport layer. This could cause a crash, especially when several connections runs in parallel as the server cache is shared among threads. Thanks to the previous patch which reworks QUIC MUX init, this solution can now be fixed. Indeed, if conn_get_alpn() is not successful, MUX can look at the server cache again to use the expected value. Note that this could still prevent the MUX to work as expected if the server cache is resetted between connect_server() and MUX init. Thus, the ultimate solution would be to copy the cached ALPN into the connection. This problem is not specific to QUIC though, and must be fixed in a separate patch.
HAProxy
HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
Installation
The INSTALL file describes how to build HAProxy. A list of packages is also available on the wiki.
Getting help
The discourse and the mailing-list are available for questions or configuration assistance. You can also use the slack or IRC channel. Please don't use the issue tracker for these.
The issue tracker is only for bug reports or feature requests.
Documentation
The HAProxy documentation has been split into a number of different files for ease of use. It is available in text format as well as HTML. The wiki is also meant to replace the old architecture guide.
Please refer to the following files depending on what you're looking for:
- INSTALL for instructions on how to build and install HAProxy
- BRANCHES to understand the project's life cycle and what version to use
- LICENSE for the project's license
- CONTRIBUTING for the process to follow to submit contributions
The more detailed documentation is located into the doc/ directory:
- doc/intro.txt for a quick introduction on HAProxy
- doc/configuration.txt for the configuration's reference manual
- doc/lua.txt for the Lua's reference manual
- doc/SPOE.txt for how to use the SPOE engine
- doc/network-namespaces.txt for how to use network namespaces under Linux
- doc/management.txt for the management guide
- doc/regression-testing.txt for how to use the regression testing suite
- doc/peers.txt for the peers protocol reference
- doc/coding-style.txt for how to adopt HAProxy's coding style
- doc/internals for developer-specific documentation (not all up to date)
License
HAProxy is licensed under GPL 2 or any later version, the headers under LGPL 2.1. See the LICENSE file for a more detailed explanation.