LiteSpeed Web Server

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LiteSpeed Web Server
LiteSpeed Web Server Logo.png
Original author(s) George Wang
Developer(s) LiteSpeed Technologies
Initial release July 1, 2003; 15 years ago (July 1, 2003)[1]
Stable release
5.2.8 / 6 June 2018; 4 months ago (2018-06-06)[2]
Written in C, C++
Operating system CloudLinux OS, Centos/Red Hat/Fedora, Debian/Ubuntu, FreeBSD
Type Web server
License Non-free proprietary

LiteSpeed Web Server (LSWS), is proprietary web server software. It is the 4th most popular web server, estimated to be used by 3.5% of websites as of October 2018.[3] LSWS is developed by privately held LiteSpeed Technologies. The software is an Apache drop-in replacement, meaning it uses the same configuration format as Apache.[4][5]

LSWS was released in 2003, and in August 2008 it became the 16th most popular web server.[6] 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.[7] In 2017, a team from Hong Kong Polytechnic University found it to be one of the six most popular web servers,[8] and it was estimated by a team at RWTH Aachen University to be running 9.2% of all HTTP/2-enabled websites.[9] As of December 2017, LSWS was used by 97.5% of websites using QUIC.[10]


LiteSpeed Web Server (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.[11]


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, Direct Admin, 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.[12]

See also[edit]


  1. ^ a b "LiteSpeed Web Server Release Log Archive". LightSpeed. Retrieved 1 September 2017.
  2. ^ "LiteSpeed Web Server Release Log". LightSpeed. Retrieved 13 November 2017.
  3. ^ "Usage of web servers for websites". W3Techs. Retrieved 1 September 2017.
  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. ^ "August 2008 Web Server Survey". Netcraft. 29 August 2008. Retrieved 1 September 2017.
  7. ^ "November 2016 Web Server Survey". Netcraft. 22 November 2016. Retrieved 1 September 2017.
  8. ^ 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): 1661–1671. doi:10.1109/icdcs.2017.279.
  9. ^ 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.
  10. ^ "Distribution of web servers among websites that use QUIC".
  11. ^ "Event-Driven vs. Process-Based Web Servers". LightSpeed. Retrieved 1 September 2017.
  12. ^ "LiteSpeed Announces QUIC Support". Retrieved 7 September 2017.