475a69d224
The "early-hints" option can now be set to "only", in which case the cache will only store data relevant to the emission of 103 Early Hints responses. Hint records are extracted on the fly from the live response HTX rather than going through a full-storage-then-strip cycle: the entry is created as CACHE_EF_STRIPPED directly, with hint records written past the cache_entry header at storage time. Response bodies are never stored. Because entries are stripped from the start, eviction in this mode never has to strip a full entry; the full LRU stays empty and cache_make_room() falls through to evicting the oldest stripped entry when the cache fills up. The max-object-size check (which gates caching based on the upstream- announced Content-Length) is bypassed in this mode: the actual stored entry is just the hint records (typically under 1 KB), so applying it to the body size would needlessly discard hints for arbitrarily large responses. As a hints-only entry is never served as a response, the backend response is forwarded unchanged in this mode: in particular its Age header is kept rather than stripped as it is for a stored response. |
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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
- doc/haterm.txt and doc/haload.txt for load generation utilities
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.