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://sysoev.ru/nginx/nginx-0.8.22.tar.gz(linux)
http://sysoev.ru/nginx/nginx-0.8.22.zip(win)

Changes with nginx 0.8.22 03 Nov 2009

*) Feature: the "proxy_bind", "fastcgi_bind", and "memcached_bind"
directives.

*) Feature: the "access" and the "deny" directives support IPv6.

*) Feature: the "set_real_ip_from" directive supports IPv6 addresses in
request headers.

*) Feature: the "unix:" parameter of the "set_real_ip_from" directive.

*) Bugfix: nginx did not delete unix domain socket after configuration
testing.

*) Bugfix: nginx deleted unix domain socket while online upgrade.

*) Bugfix: the "!-x" operator did not work.
Thanks to Maxim Dounin.

*) Bugfix: a segmentation fault might occur in a worker process, if
limit_rate was used in HTTPS server.
Thanks to Maxim Dounin.

*) Bugfix: a segmentation fault might occur in a worker process while
$limit_rate logging.
Thanks to Maxim Dounin.

*) Bugfix: a segmentation fault might occur in a worker process, if
there was no "listen" directive in "server" block; the bug had
appeared in 0.8.