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# nginx反向代理报 IllegalArgumentException

代理Tomcat9

  1. 配置完nginx,访问反向代理的路径时报异常，异常信息如下：
java.lang.IllegalArgumentException: The character [_] is never valid in a domain name.
                at org.apache.tomcat.util.http.parser.HttpParser$DomainParseState.next(HttpParser.java:963)
                at org.apache.tomcat.util.http.parser.HttpParser.readHostDomainName(HttpParser.java:859)
                at org.apache.tomcat.util.http.parser.Host.parse(Host.java:71)
                at org.apache.tomcat.util.http.parser.Host.parse(Host.java:45)
                at org.apache.coyote.AbstractProcessor.parseHost(AbstractProcessor.java:288)
                at org.apache.coyote.http11.Http11Processor.prepareRequest(Http11Processor.java:810)
                at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:384)
                at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
                at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853)
                at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587)
                at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
                at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
                at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
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  1. 经过仔细排查和上网查询，是配置时负载均衡配置出了问题

原因是在nginx配置文件中配置upstream时用了“_”字符！！

//报错时候是这样的
upstream tomcat_server{
    server  127.0.0.1:8080;
}
//修改后
upstream tomcatServer{
    server  127.0.0.1:8080;
}
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参考：https://www.cnblogs.com/arebirth/p/nginxerror_.html