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今天修改nginx配置文件就报这个错误
nginx: [emerg] unknown directive " " in /opt/nginx/conf/nginx.conf:3
然后我上网开始查询资料，查了半天才知道原来是用记事本修改的原因，
只要使用记事本修改，保存后就UTF-8都会加BOM头
接下来说解决方法：
把配置文件的内容复制到非记事本工具，比如notepad++、editplus等等另存为一个新的nginx.conf文件，注意：报文格式为UTF-8把新保存的文件替换被记事本改过的文件，重启nginx成功
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