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。Changes with nginx 0.8.50                                        02 Sep 2010

    *) Feature: the "secure_link", "secure_link_md5", and
       "secure_link_expires" directives of the ngx_http_secure_link_module.

    *) Feature: the -q switch.
       Thanks to Gena Makhomed.

    *) Bugfix: worker processes may got caught in an endless loop during
       reconfiguration, if a caching was used; the bug had appeared in
       0.8.48.

    *) Bugfix: in the "gzip_disable" directive.
       Thanks to Derrick Petzold.

    *) Bugfix: nginx/Windows could not send stop, quit, reopen, and reload
       signals to a process run in other session.

下载地址：
WIN：http://nginx.org/download/nginx-0.8.50.zip
LINUX：http://nginx.org/download/nginx-0.8.50.tar.gz