在配置Nginx的反向代理，访问反向代理的路径而出现了异常
java.lang.IllegalArgumentException: The character [_] is never valid in a domain name.
原因是在nginx配置文件中配置upstream时用了“_”字符！！
我们只需要把 ”_”去掉即可解决问题！
ps：
在Tomcat7中可以，Tomcat8却不可以...注意下吧！
Nginx配置Tomcat8反向代理出现 java.lang.IllegalArgumentException: The character [_] is never valid in a domain name.
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