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作者介绍
林伟壕，网络安全DevOps新司机，先后在中国电信和网易游戏从事数据网络、网络安全和游戏运维工作。对Linux运维、虚拟化和网络安全防护等研究颇多，目前专注于网络安全自动化检测、防御系统构建。
众所周知，Nginx是目前最流行的WebServer之一，也广泛应用于负载均衡、反向代理等服务，使用过程中可能因为对Nginx工作原理、变量含义、参数大小等问题的理解错误，导致Nginx工作异常。
因此，本文将从一个Nginx错误代码引发的故障入手，谈谈如何分析和修复常见的Nginx异常。
故障简述
小明某天中午在线优化一个敏感服务的Nginx配置时，发现5分钟内Nginxerrorlog里出现了大量错误，于是迅速回滚了Nginx配置。
故障详情
原来的Nginx配置存在重复或者需废弃的内容，于是在多次diff了新旧两份配置内容后，小明认为最新配置是不影响业务的，因此在线推送更新配置后，直接reload了Nginx，出于doublecheck原则，在线观察了5分钟Nginx日志：
/etc/init.d/Nginxreload
tail-f/var/log/access.log
tail-f/var/log/error.log
发现出现大量类似下面的错误：
1.1.1.1--[21/Feb/:13:53:00+]"GET/x/get?id=hh2aid=currenttime=num=flag=1host=user=60%2E%2E%2E66logintime=username=howru%2D10HTTP/1.1"166"-""-""...10""0.""-""-"
错误的产生，很可能影响服务端或客户端的后续业务逻辑判断，因此需要引起重视。
处理过程
节点1
当时回滚配置后，小明先在搜索引擎查找了Nginx错误的可能原因和解决办法，初步确定有下面两种可能：1是空主机头，2是请求包头过大。
小明跟客户端同学确认了客户端请求方式，发现他们使用的是类似telnet的方式发起的中科与白癜风患者心心相印北京最好的白癜风医院在那
