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It is especially a problem with Lua filters, but it is important to disable the 0-copy forwarding if a filter alters the payload, or at least to be able to disable it. While the filter is registered on the data filtering, it is not an issue (and it is the common case) because, there is now way to fast-forward data at all. But it may be an issue if a filter decides to alter the payload and to unregister from data filtering. In that case, the 0-copy forwarding can be re-enabled in a hardly precdictable state. To fix the issue, a SC flags was added to do so. The HTTP compression filter set it and lua filters too if the body length is changed (via HTTPMessage.set_body_len()). Note that it is an issue because of a bad design about the HTX. Many info about the message are stored in the HTX structure itself. It must be refactored to move several info to the stream-endpoint descriptor. This should ease modifications at the stream level, from filter or a TCP/HTTP rules. This should be backported as far as 3.0. If necessary, it may be backported on lower versions, as far as 2.6. In that case, it must be reviewed and adapted.
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.