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.
![Nginx配置Tomcat8反向代理出现 java.lang.IllegalArgumentException: The character [_] is never valid in a domain name.](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhCekwybHRaekl3TVRndVkyNWliRzluY3k1amIyMHZZbXh2Wnk4eE56WXdOVGN6THpJd01Ua3dPUzh4TnpZd05UY3pMVEl3TVRrd09USTNNVEV5TmpRNU1UUTNMVEU1Tnpnek56RTNPVE11Y0c1bi5qcGc%3D.jpg?w=700&webp=1 "Nginx配置Tomcat8反向代理出现 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！！
![Nginx配置Tomcat8反向代理出现 java.lang.IllegalArgumentException: The character [_] is never valid in a domain name.](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhCekwybHRaekl3TVRndVkyNWliRzluY3k1amIyMHZZbXh2Wnk4eE56WXdOVGN6THpJd01Ua3dPUzh4TnpZd05UY3pMVEl3TVRrd09USTNNVEV5TnpNMk1EWTJMVGN3TWpFek5qVTJNeTV3Ym1jPS5qcGc%3D.jpg?w=700&webp=1 "Nginx配置Tomcat8反向代理出现 java.lang.IllegalArgumentException: The character [_] is never valid in a domain name.")
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！
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！