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A major change was recently implemented to change QUIC MUX Tx buffer allocation limit, which is now based on the current connection congestion window size. As this size may be smaller than the previous static value, it is likely that the limit will be reached more frequently. When using HTTP/3, the majority of requests streams are used for small object exchanges. Every responses start with a HEADERS frames which should be much smaller in size than the default buffer. But as the whole buffer size is accounted against the congestion window, a single stream can block others even if only emitting a single HEADERS frame which is suboptimal for bandwith usage, if the congestion window is small enough. To adapt to this new situation, rely on the newly available small buffers to transfer HEADERS frame response. This at least guarantee that several parallel streams could allocate their own buffer for the first part of the response, even with a small congestion window. The situation could be further improve to use various indication on the data size and select a small buffer if sufficient. This could be done for example via the Content-length value or HTX extra field. However this must be the subject of a dedicated 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.