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.下载:
http://nginx.org/download/nginx-0.8.38.tar.gz (linux)
http://nginx.org/download/nginx-0.8.38.zip (win)

Changes with nginx 0.8.38 24 May 2010

*) Feature: the "proxy_no_cache" and "fastcgi_no_cache" directives.

*) Feature: now the "rewrite" directive does a redirect automatically
if the $scheme variable is used.
Thanks to Piotr Sikora.

*) Bugfix: now "limit_req" delay directive conforms to the described
algorithm.
Thanks to Maxim Dounin.

*) Bugfix: the $uid_got variable might not be used in the SSI and perl
modules.