6743e128f3
For regular H2 messages, the HTX EOM flag is synonymous the end of input. So SE_FL_EOI flag must also be set on the stream-endpoint descriptor. However, there is an exception. For tunneled streams, the end of message is reported on the HTX message just after the headers. But in that case, no end of input is reported on the SE. But here, there is a bug. The "early" EOM is also report on the HTX messages when there is no payload (for instance a content-length set to 0). If there is no ES flag on the H2 HEADERS frame, it is an unexpected case. Because for the applicative stream and most probably for the opposite endpoint, the message is considered as finihsed. It is switched in its DONE state (or the equivalent on the endpoint). But, if an extra H2 frame with the ES flag is received, a TRAILERS frame or an emtpy DATA frame, an extra EOT HTX block is pushed to carry the HTX EOM flag. So an extra HTX block is emitted for a regular HTX message. It is totally invalid, it must never happen. Because it is an undefined behavior, it is difficult to predict the result. But it definitly prevent the applicative stream to properly handle aborts and errors because data remain blocked in the channel buffer. Indeed, the end of the message was seen, so no more data are forwarded. It seems to be an issue for 2.8 and upper. Harder to evaluate for older versions. This patch must be backported as far as 2.4.
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.