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LiteSpeed Web Server

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LiteSpeed Web Server
Original author(s)George Wang
Developer(s)LiteSpeed Technologies
Initial releaseJuly 1, 2003; 21 years ago (July 1, 2003)[1]
Stable release
5.4.12 / 22 March 2021; 3 years ago (2021-03-22)[2]
Written inC, C++
Operating systemCloudLinux OS, AlmaLinux/Centos/Red Hat/Fedora, Debian/Ubuntu, FreeBSD
TypeWeb server
LicenseNon-free proprietary or GPL3

LiteSpeed Web Server (LSWS) is proprietary web server software. It is the 4th most popular web server, estimated to be used by 10% of websites as of July 2021.[3] LSWS is developed by privately held LiteSpeed Technologies. The software uses the same configuration format as Apache HTTP Server and is compatible with most Apache features.[4][5] An open source variant[6] is also available.[7]

LSWS was released in 2003, and in August 2008 it became the 16th most popular web server.[8] In November 2016, LiteSpeed's market share grew from 0.39% to 3.29%, increasing its position from 10th to 4th most popular web server according to Netcraft.[9] In 2017, a team from Hong Kong Polytechnic University found it to be one of the six most popular web servers,[10] and it was estimated by a team at RWTH Aachen University to be running 9.2% of all HTTP/2-enabled websites.[11] As of April 2020, LSWS was used by 69.3% of websites using QUIC[12] and 47.6% of websites using HTTP/3.[13]

According to a Netcraft web server survey, LiteSpeed had not grown beyond 3% of global market share as of 2021.[14]

LiteSpeed Cache plugin, also known as LSCache, is a cache and performance management plugin for websites developed specifically for LiteSpeed Web Server. It is available as a plugin from WordPress.



LSWS is compatible with commonly-used Apache features, including mod_rewrite, .htaccess, and mod_security. LSWS can load Apache configuration files directly and works as a drop-in replacement for Apache while fully integrating with popular control panels. LSWS replaces all Apache functions, but uses an event driven approach to handle requests.[15]



LiteSpeed Technologies was founded in early 2002 by a team of engineers led by George Wang. On July 1, 2003, LiteSpeed Web Server was officially released as a full-featured web server. In 2007, LiteSpeed Web Server became LiteSpeed Web Server Enterprise and was configured to be an Apache drop-in replacement. In that same year, the web server integrated with cPanel, DirectAdmin, and Plesk. LiteSpeed Web Server officially began supporting HTTP/2 in 2015 with version 5.0, and also released LSCache (cache plugin for WordPress) with ESI in version 5.0.10.[1] In 2017, LSWS released QUIC support.[16] In July 2019, LSWS announced support for HTTP/3.[17]

See also



  1. ^ a b "LiteSpeed Web Server Release Log Archive". LiteSpeed. Retrieved 1 September 2017.
  2. ^ "LiteSpeed Web Server Release Log". LiteSpeed. Retrieved 11 August 2020.
  3. ^ "Usage of web servers for websites". W3Techs. Retrieved 27 July 2021.
  4. ^ "August 2015 Web Server Survey". Netcraft. 13 August 2015. Retrieved 1 September 2017.
  5. ^ Adelstein, Tom; Lubanovic, Bill (2007). Linux system administration (1st ed.). Sebastopol, CA: O'Reilly. p. 162. ISBN 9780596009526. OCLC 71808193.
  6. ^ "How to install OpenLiteSpeed on Rocky Linux 9 | CentLinux". www.centlinux.com. 18 April 2023. Retrieved 2023-04-20.
  7. ^ "Get OpenLiteSpeed!". 28 October 2019. Retrieved 28 October 2019.
  8. ^ "August 2008 Web Server Survey". Netcraft. 29 August 2008. Retrieved 1 September 2017.
  9. ^ "November 2016 Web Server Survey". Netcraft. 22 November 2016. Retrieved 1 September 2017.
  10. ^ Jiang, M.; Luo, X.; Miu, T.; Hu, S.; Rao, W. (June 2017). "Are HTTP/2 Servers Ready Yet?". 2017 IEEE 37th International Conference on Distributed Computing Systems (ICDCS). pp. 1661–1671. doi:10.1109/icdcs.2017.279. ISBN 978-1-5386-1792-2. S2CID 4700093.
  11. ^ Zimmermann, Torsten; Rüth, Jan; Wolters, Benedikt; Hohlfeld, Oliver (2017). "How HTTP/2 Pushes the Web: An Empirical Study of HTTP/2 Server Push" (PDF). IFIP Networking Conference.
  12. ^ "Distribution of web servers among websites that use QUIC". Retrieved 2020-04-19.
  13. ^ "Distribution of Web Servers among websites that use HTTP/3". W3techs.com. 2019-12-02. Retrieved 2020-04-19.
  14. ^ "Netcraft web server survey". Netcraft. March 2021.
  15. ^ "Event-Driven vs. Process-Based Web Servers". LiteSpeed. Retrieved 1 September 2017.
  16. ^ "LiteSpeed Announces QUIC Support". 11 July 2017. Retrieved 7 September 2017.
  17. ^ "LiteSpeed Web Server Release Log".