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HAProxy - Load balancer
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Willy Tarreau 00941af7b7 BUG/MEDIUM: mux-h2: fix the detection of the ext connect support 
As reported by Huangbin Zhan (@zhanhb) in github issue #3355, latest
commit 96f7ff4fdd ("MINOR: mux-h2: add a new message flag to indicate
ext connect support") was not correct and can break RFC8441-compliant
clients, as it did for them with a variant of Chrome 142.

The problem is that while RFC9113 says that new pseudo-headers are only
permitted with *negotiated* extensions, and RFC8441 doesn't indicate
whether or not SETTINGS_ENABLE_CONNECT_PROTOCOL is needed from clients,
it only says that clients know that servers support the extension when
seeing it in their settings and can use it, which seems to imply that
they don't need to send it to indicate their willingness to use it.
This also means that the server cannot know if a client is expected to
use it or not by default. It only know that a client is not allowed to
use it if the server didn't emit support mentioning it, which haproxy
can do using h2-workaround-bogus-websocket-clients.

Thus the fix proposed by @zhanhb is right, when presetting the flag for
the parser to indicate whether or not we're willing to accept RFC8441's
:protocol pseudo-header, we should:
  - consider the received setting on the backend side (though the
    pseudo-header is neither used nor supported there, but at least
    we pass the info regarding the support of the extension)
  - consider the configuration for the frontend (since it's the only
    place where we can decide on support or not)

This patch does just that and reverts the accompanying changes to the
regtests that made them want to see the client's setting. It must be
backported to 2.6.

In the mean time, placing this option in the global section will force
the clients to downgrade to h1:

    h2-workaround-bogus-websocket-clients

Many thanks again to @zhanbb this feedback and proposing a tested fix.
2026-05-07 17:34:39 +02:00
.github CI: github: add DEBUG_STRICT=2 to ASAN jobs 2026-04-30 17:46:30 +02:00
addons DOC: otel: update the filter's status and URL in the docs 2026-05-04 14:38:35 +02:00
admin CLEANUP: fix typos and spelling in comments and documentation 2026-03-30 09:24:19 +02:00
dev CLEANUP: fix typos and spelling in comments and documentation 2026-03-30 09:24:19 +02:00
doc MINOR: acme: allow specifying custom MAC alg for EAB 2026-05-07 15:19:15 +02:00
examples EXAMPLES: ssl: keylog entries are greater than 1024 2026-04-14 16:24:28 +02:00
include MINOR: acme: allow specifying custom MAC alg for EAB 2026-05-07 15:19:15 +02:00
reg-tests BUG/MEDIUM: mux-h2: fix the detection of the ext connect support 2026-05-07 17:34:39 +02:00
scripts BUG/MINOR: reg-tests: make shell syntax errors fatal 2026-04-22 15:18:22 +02:00
src BUG/MEDIUM: mux-h2: fix the detection of the ext connect support 2026-05-07 17:34:39 +02:00
tests TESTS: quic: add unit-tests for QUIC TX part 2025-09-08 14:49:03 +02:00
.cirrus.yml CI: cirrus-ci: bump FreeBSD image to 14-3 2025-10-09 14:06:48 +02:00
.gitattributes MINOR: Configure the cpp userdiff driver for *.[ch] in .gitattributes 2021-02-22 18:17:57 +01:00
.gitignore MINOR: tevt/dev: Add term_events tool 2025-01-31 10:41:50 +01:00
.mailmap DOC: update Tim's address in .mailmap 2021-09-16 09:14:14 +02:00
.travis.yml MEDIUM: mworker: remove USE_SYSTEMD requirement for -Ws 2024-11-20 12:07:38 +01:00
BRANCHES DOC: clarify the experimental status for certain features 2025-10-17 18:41:13 +02:00
BSDmakefile BUILD: makefile: commit the tiny FreeBSD makefile stub 2023-05-24 17:17:36 +02:00
CHANGELOG [RELEASE] Released version 3.4-dev10 2026-04-29 15:51:32 +02:00
CONTRIBUTING CLEANUP: assorted typo fixes in the code and comments 2025-04-02 11:12:20 +02:00
INSTALL MINOR: version: mention that it's development again 2025-11-26 16:11:47 +01:00
LICENSE LICENSE: add licence exception for OpenSSL 2012-09-07 13:52:26 +02:00
MAINTAINERS MAJOR: spoe: Let the SPOE back into the game 2024-05-22 09:04:38 +02:00
Makefile BUILD: use Makefile.mk instead of Makefile.inc in EXTRA_MAKE 2026-05-07 16:50:52 +02:00
README.md CI: github: add cross-zoo.yml in README.md 2026-04-20 11:47:20 +02:00
SUBVERS BUILD: use format tags in VERDATE and SUBVERS files 2013-12-10 11:22:49 +01:00
VERDATE [RELEASE] Released version 3.4-dev10 2026-04-29 15:51:32 +02:00
VERSION [RELEASE] Released version 3.4-dev10 2026-04-29 15:51:32 +02:00

README.md

HAProxy

AWS-LC Illumos NetBSD CrossCompile FreeBSD VTest

HAProxy logo

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:

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.