# HAProxy

Cloned from https://en.wikipedia.org/wiki/HAProxy.

Wikipedia text is available under [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/).

Page id: 38574095.

HAProxy is a free and open source software that provides a high availability load balancer and proxy (forward proxy, reverse proxy) for TCP and HTTP-based applications that spreads requests across multiple servers. It is written in C and has a reputation for being fast and efficient (in terms of processor and memory usage).
HAProxy is used by a number of high-profile websites including GoDaddy, GitHub, Bitbucket, Stack Overflow, Reddit, Slack, Speedtest.net, Tumblr, Twitter and Tuenti and is used in the OpsWorks product from Amazon Web Services.


== History ==
HAProxy was written in 2000 by Willy Tarreau, a core contributor to the Linux kernel, who still maintains the project.
In 2013, the company HAProxy Technologies, LLC was created. The company provides a commercial offering, HAProxy Enterprise and appliance-based application-delivery controllers named ALOHA.


== Features ==
HAProxy has the following features:

Layer 4 (TCP) and Layer 7 (HTTP) load balancing
Multi-factor stickiness
URL rewriting
Rate limiting
SSL/TLS termination proxy
Gzip compression
Caching
PROXY Protocol support
Scriptable multi-layer Health checking
Connection and HTTP message logging
HTTP/2 support on both sides
HTTP/3 support
WebSocket (RFC6455 and RFC8441)
UDP/TCP Syslog load-balancing and forwarding/transcribing (RFC3164 and RFC5424)
Event-driven Multithreaded architecture
Hitless reloads
gRPC Support
Lua and SPOE Support
API Support
Layer 4/7 Retries
Simplified circuit breaking
Advanced debugging and tracing facilities
Distributed stick-tables for stats collection and DoS mitigation


== HAProxy Community vs HAProxy Enterprise ==
HAProxy Enterprise Edition is an enterprise-class version of HAProxy that includes enterprise suite of add-ons, expert support, and professional services. It has some features backported from the HAProxy development branch.


== ALOHA ==
HAProxy Technologies’ ALOHA is a plug-and-play load-balancing appliance that can be deployed in any environment. ALOHA provides a graphical interface and a templating system that can be used to deploy and configure the appliance.


== Versions ==
HAProxy has had the following version releases:


== Performance ==
Servers equipped with 6 to 8 cores generally achieve between 200,000 and 500,000 requests per second, and have no trouble saturating a 25 Gbit/s connection under Linux. 64-core ARM servers were shown to reach 2 million requests per second and 100 Gbit/s.


== Similar software ==
Nginx
Gearman
Pound
Vinyl Cache
Envoy by CNCF


== See also ==

LAMP, LYME, and LEAP


== References ==


== External links ==
HAProxy Enterprise Website
HAProxy Wiki on GitHub
HAProxy issue tracker on GitHub