bbf824933f
Annika Wickert reported some occasional disconnections between haproxy and varnish when communicating over HTTP/2, with varnish complaining about protocol errors while captures looked apparently normal. Nils Goroll managed to reproduce this on varnish by injecting the capture of the outgoing haproxy traffic and noticed that haproxy was forwarding a header value containing a trailing space, which is now explicitly forbidden since RFC9113. It turns out that the only way for such a header to pass through haproxy is to arrive in h2 and not be edited, in which case it will arrive in HTX with its undesired spaces. Since the code dealing with HTX headers always trims spaces around them, these are not observable in dumps, but only when started in debug mode (-d). Conversions to/from h1 also drop the spaces. With this patch we trim LWS both on input and on output. This way we always present clean headers in the whole stack, and even if some are manually crafted by the configuration or Lua, they will be trimmed on the output. This must be backported to all stable versions. Thanks to Annika for the helpful capture and Nils for the help with the analysis on the varnish side!
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.