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Normally, when reading a full buffer, or exactly the requested size, it is not really possible to know if the peer had closed immediately after, and usually we don't care. There's a problematic case, though, which is with SSL: the SSL layer reads in small chunks of a few bytes, and can consume a client_hello this way, then start computation without knowing yet that the client has aborted. In order to permit knowing more, we now introduce a new read flag, CO_RFL_TRY_HARDER, which says that if we've read up to the permitted limit and the flag is set, then we attempt one extra byte using MSG_PEEK to detect whether the connection was closed immediately after that content or not. The first use case will obviously be related to SSL and client_hello, but it might possibly also make sense on HTTP responses to detect a pending FIN at the end of a response (e.g. if a close was already advertised).
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.