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。
改进内容：
*) Bugfix: nginx did not support all ciphers and digests used in client certificates.
*) Bugfix: nginx cached incorrectly FastCGI responses if there was large stderr output before response.
*) Bugfix: nginx did not support HTTPS referrers.
*) Bugfix: nginx/Windows might not find file if path in configuration was given in other character case; the bug had appeared in 0.8.33.
*) Bugfix: the $date_local variable has an incorrect value, if the "%s" format was used.
*) Bugfix: if ssl_session_cache was not set or was set to "none", then during client certificate verify the error "session id context uninitialized" might occur; the bug had appeared in 0.7.1.
*) Bugfix: a geo range returned default value if the range included two or more /16 networks and did not begin at /16 network boundary.
*) Bugfix: a block used in a "stub" parameter of an "include" SSI directive was output with "text/plain" MIME type.
*) Bugfix: $r->sleep() did not work; the bug had appeared in 0.8.11.
