25fcee5b0c
The HTTP cache now supports sending 103 Early Hints responses if enabled, without the need for explicit per-rule configuration. Two paths feed the 103 response depending on the matched entry. A stripped entry (CACHE_EF_STRIPPED) carries its Link records pre-extracted alongside the cache entry header and is copied out of the row as-is. A complete entry only carries the cached HTX; the Link headers are walked on the fly at request time, deliberately avoiding the extra storage cost of duplicating them alongside the body. The on-the-fly path has a cost: a workload where many hits land on expired complete entries re-parses the cached response on each hit. To bound this, the first such hit also strips the entry in place when conditions allow (the hints pool is below its cap, and the row is not currently being read by another request); subsequent hits for the same URL then take the cheap pre-extracted path. To let the cache-use lookup reach that logic, get_entry() now returns expired entries to callers passing delete_expired=0; such callers are responsible for checking entry->expire themselves. |
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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.