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As discussed here: https://github.com/httpwg/http2-spec/pull/936 https://github.com/haproxy/haproxy/issues/2941 It's important to take care of some special characters in the :authority pseudo header before reassembling a complete URI, because after assembly it's too late (e.g. the '/'). This patch adds a specific function which was checks all such characters and their ranges on an ist, and benefits from modern compilers optimizations that arrange the comparisons into an evaluation tree for faster match. That's the version that gave the most consistent performance across various compilers, though some hand-crafted versions using bitmaps stored in register could be slightly faster but super sensitive to code ordering, suggesting that the results might vary with future compilers. This one takes on average 1.2ns per character at 3 GHz (3.6 cycles per char on avg). The resulting impact on H2 request processing time (small requests) was measured around 0.3%, from 6.60 to 6.618us per request, which is a bit high but remains acceptable given that the test only focused on req rate. The code was made usable both for H2 and H3.
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.