nginx轻量web服务器v1.13.1免费版是一款轻量级的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。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。
nginx简介
自 Nginx 发布四年来，Nginx 已经因它的稳定性、丰富的功能集、示例配置文件和低系统资源的消耗而闻名了。Nginx 超越Apache的高性能和稳定性，使得国内使用 Nginx 作为 Web 服务器的网站也越来越多。目前国内各大门户网站已经部署了Nginx，如新浪、网易、腾讯等；新近发现 Nginx 技术在国内日趋火热，越来越多的网站开始应用部署Nginx。
更新内容
Nginx 1.13.1 发布了。更新内容如下：
Feature: now a hostname can be used as the "set_real_ip_from" directive parameter.
Feature: vim syntax highlighting scripts improvements.Feature: the "worker_cpu_affinity" directive now works on DragonFly BSD.
Bugfix: SSL renegotiation on backend connections did not work when using OpenSSL before 1.1.0.
Workaround: nginx could not be built with Oracle Developer Studio 12.5.
Workaround: now cache manager ignores long locked cache entries when cleaning cache based on the "max_size" parameter.
Bugfix: client SSL connections were immediately closed if deferred accept and the "proxy_protocol" parameter of the "listen" directive were used.
Bugfix: in the "proxy_cache_background_update" directive.
Workaround: now the "tcp_nodelay" directive sets the TCP_NODELAY option before an SSL handshake.
