消息 The character [_] is never valid in a domain name.

HTTP Status 400 – 錯誤的請求
Type 異常報告
消息 The character [_] is never valid in a domain name.
描述 The server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing).
Exception
java.lang.IllegalArgumentException: The character [_] is never valid in a domain name.
	org.apache.tomcat.util.http.parser.HttpParser$DomainParseState.next(HttpParser.java:926)
	org.apache.tomcat.util.http.parser.HttpParser.readHostDomainName(HttpParser.java:822)
	org.apache.tomcat.util.http.parser.Host.parse(Host.java:71)
	org.apache.tomcat.util.http.parser.Host.parse(Host.java:45)
	org.apache.coyote.AbstractProcessor.parseHost(AbstractProcessor.java:288)
	org.apache.coyote.http11.Http11Processor.prepareRequest(Http11Processor.java:809)
	org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:384)
	org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
	org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
	org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1417)
	org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	java.lang.Thread.run(Thread.java:748)
Note 主要問題的所有 stack 信息能夠在 server logs 裏查看
Apache Tomcat/9.0.14

解決： web_nginx改成webnginx，nginx的upstream不支持tomcat8下劃線。 參考： https://blog.csdn.net/u010689849/article/details/84194376