nginx ("engine x") 是由俄罗斯的程序设计师Igor Sysoev所开发的一个高性能的 http 和 反向代理 服务器,也是一个 imap/pop3/smtp 代理服务器. nginx 是由 igor sysoev 为俄罗斯访问量第二的 rambler.ru 站点开发的,它已经在该站点运行超过两年半了.igor 将源代码以类bsd许可证的形式发布.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 0.8.33           
*) Security: now nginx/Windows ignores trailing spaces in URI.
    Thanks to Dan Crowley, Core Security Technologies.
*) Security: now nginx/Windows ignores short files names.
    Thanks to Dan Crowley, Core Security Technologies.
*) Change: now keepalive connections after POST requests are not
    disabled for MSIE 7.0+. Thanks to Adam Lounds.
*) Workaround: now keepalive connections are disabled for Safari.
    Thanks to Joshua Sierles.
*) Bugfix: if a proxied or FastCGI request was internally redirected to
    another proxied or FastCGI location, then $upstream_response_time
    variable may have abnormally large value; the bug had appeared in
    0.8.7.
*) Bugfix: a segmentation fault might occur in a worker process, while
    discarding a request body; the bug had appeared in 0.8.11.
Changes with nginx 0.8.30 15 Dec 2009
*) Change: now the default buffer size of the
"large_client_header_buffers" directive is 8K.
Thanks to Andrew Cholakian.
*) Feature: the conf/fastcgi.conf for simple FastCGI configurations.
*) Bugfix: nginx/Windows tried to rename a temporary file twice if the
file should replace an already existent file.
*) Bugfix: of "double free or corruption" error issued if host could
not be resolved; the bug had appeared in 0.8.22.
Thanks to Konstantin Svist.
*) Bugfix: in libatomic usage on some platforms.