本文共 1497 字，大约阅读时间需要 4 分钟。

springboot2.0工程，在使用内嵌tomcat时，服务器使用docker+nginx做转发，提示400错误

原因是nginx（nginx:1.11.6-alpine）的upstream使用的"_"导致 的，服务端会跑出

java.lang.IllegalArgumentException: The character [_] is never valid in a domain name.

解决方法，奖upstream中的“_”去掉即可

java.lang.IllegalArgumentException: The character [_] is never valid in a domain name.	at org.apache.tomcat.util.http.parser.HttpParser$DomainParseState.next(HttpParser.java:946)	at org.apache.tomcat.util.http.parser.HttpParser.readHostDomainName(HttpParser.java:842)	at org.apache.tomcat.util.http.parser.Host.parse(Host.java:66)	at org.apache.tomcat.util.http.parser.Host.parse(Host.java:40)	at org.apache.coyote.AbstractProcessor.parseHost(AbstractProcessor.java:286)	at org.apache.coyote.http11.Http11Processor.prepareRequest(Http11Processor.java:1203)	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:776)	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)	at java.lang.Thread.run(Thread.java:748)

转载地址：http://fhmdi.baihongyu.com/