|Original author(s)||Jan Kneschke|
|Initial release||March 2003|
lighttpd (pronounced "lighty") is an open-source web server more optimized for speed-critical environments than common products while remaining standards-compliant, secure and flexible. It was originally written by Jan Kneschke as a proof-of-concept of the c10k problem - how to handle 10,000 connections in parallel on one server, but has gained worldwide popularity.
The low memory footprint (compared to other web servers), small CPU load and speed optimizations make lighttpd suitable for servers that are suffering load problems, or for serving static media separately from dynamic content. lighttpd is free software/open source, and is distributed under the BSD license. It runs natively on Unix-like operating systems as well as Microsoft Windows.
Application support 
lighttpd supports the FastCGI, SCGI and CGI interfaces to external programs, permitting web applications written in any programming language to be used with the server. As a particularly popular language, PHP performance has received special attention. Lighttpd's FastCGI can be configured to support PHP with opcode caches (like APC) properly and efficiently. Additionally, it has received attention from its popularity within the Python, Perl, Ruby and Lua communities. Lighttpd also supports WebDNA, the resilient in-memory database system designed to build database-driven websites. It is a popular web server for the Catalyst and Ruby on Rails web frameworks. Lighttpd does not support ISAPI.
- Load balancing FastCGI, SCGI and HTTP proxy support
epoll()based web server
- Support for more efficient event notification schemes like
- Conditional rewrites (mod_rewrite)
- TLS/SSL with SNI support, via OpenSSL.
- Authentication against an LDAP server
- RRDtool statistics
- Rule-based downloading with possibility of a script handling only authentication
- Server Side Includes support (but not server-side CGI)
- Flexible virtual hosting
- Modules support
- Cache Meta Language (currently being replaced by mod_magnet) using the Lua programming language
- Minimal WebDAV support
- Servlet (AJP) support (in versions 1.5.x and up)
- HTTP compression using mod_compress and the newer mod_deflate (1.5.x)
- Light-weight (less than 1 MB)
- Single-process design with only several threads. No processes or threads started per connection.
Lighttpd (1.4.x) officially does not support sending large files from CGI, FastCGI, or proxies  unless X-Sendfile is used.
Lighttpd is used by a number of high-traffic websites, among them are Meebo and YouTube. Wikimedia also runs Lighttpd servers.  Three of the most famous torrent listing websites, The Pirate Bay, Mininova (no longer operational) and isoHunt, which have more than 1,000 hits per second, also use Lighttpd.
See also 
- Comparison of lightweight web servers
- Comparison of web server software
- Traffic Server
- Web accelerator which discusses host-based HTTP acceleration
- Proxy server which discusses client-side proxies
- Reverse proxy which discusses origin-side proxies
- Internet Cache Protocol
- "lighttpd fly light". Retrieved 2010-06-13. "all of these describe lighttpd (pron. lighty)"
- "lighttpd: Story". lighttpd.net. Retrieved 22 December 2008.
- "Powered By lighttpd". Lighttpd wiki. Retrieved 22 December 2008.
- "Web Server Performance Comparison". Retrieved 15 March 2012.
- Gabriel Kerneis and Juliusz Chroboczek. Are events fast?. PPS technical report, University of Paris 7. 2009. http://www.pps.jussieu.fr/~jch/research/cpc-bench.pdf
- "Downloads @ WLMP Project". Retrieved 2011-03-27. "LightTPD webserver for Windows Systems"
- Lighttpd - Bug #1101: SSI include virtual does not run cgi - lighty labs
- "lighttpd releases". lighttpd.net. Retrieved 20 June 2010.
- "Memory usage increases when proxy+ssl+large file". lighttpd bug tracker. Retrieved 2011-04-11.
- Brion Vibber (2008-08-26). "Apache mod_php in wikipedia". Wikimedia wikitech-l mailing list. Retrieved 2008-08-27.
- Tim Starling (2008-08-27). "Apache mod_php in wikipedia". Wikimedia wikitech-l mailing list. Retrieved 2008-08-27.
- Domas Mitzuas (2008-08-27). "Apache mod_php in wikipedia". Wikimedia wikitech-l mailing list. Retrieved 2008-08-27.
- "Powered by Lighttpd". The official site. 2007-04-04. Retrieved 2008-12-22. "lighttpd is used by many well-known sites. The typical scenario is using lighttpd as off-load server to push out static content and leave the complex work to another server."
- "Fly Light With Lighttpd Web Server". ServerWatch. Retrieved 2008-02-12.
- Project Web site
- lighttpd at Freecode
- OpenVMS Lighttpd project
- #lighttpd on freenode
- Complete guide to set up your server with Lighttpd, PHP5, MySQL, e-mail, firewall etc.
- Running Django on Lighttpd via FastCGI
- Older Lighttpd for Windows builds
- Guide to set up Lighttpd MySQL Php Wordpress DNS Ubuntu from scratch on Rackspace Cloud instance
- Lighty2Go Portable LightTPD, MySQL & PHP (LiMP) Project
- yPortableWS Portable WLMP Project (requires .NET Framework)
- WLMP Project - lighttpd builds for Windows