nginx（发音同 engine x）是一款轻量级的Web 服务器／反向代理服务器及电子邮件（IMAP/POP3）代理服务器，并在一个BSD-like 协议下发行。由俄罗斯的程序设计师Igor Sysoev所开发，最初供俄国大型的入口网站及搜寻引擎Rambler（俄文：Рамблер）使用。  其特点是占有内存少，并发能力强，事实上nginx的并发能力确实在同类型的网页伺服器中表现较好.目前中国大陆使用nginx网站用户有：新浪、网易、腾讯,另外知名的微网志Plurk也使用nginx。http://sysoev.ru/nginx/nginx-0.8.21.tar.gz(linux)
http://sysoev.ru/nginx/nginx-0.8.21.zip(win)

Changes with nginx 0.8.21 26 Oct 2009

*) Feature: now the "-V" switch shows TLS SNI support.

*) Feature: the "listen" directive of the HTTP module supports unix
domain sockets.
Thanks to Hongli Lai.

*) Feature: the "default_server" parameter of the "listen" directive.

*) Feature: now a "default" parameter is not required to set listen
socket options.

*) Bugfix: nginx did not support dates in 2038 year on 32-bit platforms;

*) Bugfix: socket leak; the bug had appeared in 0.8.11.