ee95a7539e
When h1_snd_buf() inherits the CO_SFL_MSG_MORE flag from the upper layer, it unconditionally propagates it to H1C_F_CO_MSG_MORE, which eventually sets MSG_MORE on the sendmsg() call. For bodyless responses (HEAD, 204, 304), this causes the kernel to cork the TCP connection for ~200ms waiting for body data that will never be sent. With an H1 frontend and H2 backend, this adds ~200ms of latency to many or all bodyless responses. The 200ms corresponds to the kernel's tcp_cork_time default. H1 backends are less affected because h1_postparse_res_hdrs() sets HTX_FL_EOM during header parsing for bodyless responses, but H2 backends frequently deliver the end-of-stream signal in a separate scheduling round, leaving htx_expect_more() returning TRUE when headers are first forwarded. The fix guards H1C_F_CO_MSG_MORE so it is only set when the connection is a backend (H1C_F_IS_BACK) or the response is not bodyless (!H1S_F_BODYLESS_RESP). This ensures bodyless responses on the front connection are sent immediately without corking. This should be backported to all stable branches. Co-developed-by: Billy Campoli <bcampoli@meta.com> Co-developed-by: Chandan Avdhut <cavdhut@meta.com> Co-developed-by: Neel Raja <neelraja@meta.com
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.