nginx（发音同engine x）是一款由俄罗斯程序员Igor Sysoev所开发轻量级的网页服务器、反向代理服务器以及电子邮件
（IMAP/POP3）代理服务器。起初是供俄国大型的门户网站及搜索引擎 Rambler（俄语：Рамблер）使用。此软件BSD-like协议下
发行，可以在UNIX、GNU/Linux、BSD、Mac OS X、Solaris，以及Microsoft Windows等操作系统中运行。
下载：
http://nginx.org/download/nginx-1.1.7.tar.gz (linux)
Changes with nginx 1.1.7 31 Oct 2011
*) Feature: support of several resolvers in the "resolver" directive.
Thanks to Kirill A. Korinskiy.
*) Bugfix: a segmentation fault occurred on start or while
reconfiguration if the "ssl" directive was used at http level and
there was no "ssl_certificate" defined.
*) Bugfix: reduced memory consumption while proxying of big files if
they were buffered to disk.
*) Bugfix: a segmentation fault might occur in a worker process if
"proxy_http_version 1.1" directive was used.
*) Bugfix: in the "expires @time" directive.