问题：
想使用 nginx 的反向代理功能通过url前缀转发到对应的服务模块去，却发生下面的错误。
java.lang.IllegalArgumentException: The character [_] is never valid in a domain name.
org.apache.tomcat.util.http.parser.HttpParser$DomainParseState.next(HttpParser.java:974)
org.apache.tomcat.util.http.parser.HttpParser.readHostDomainName(HttpParser.java:870)
org.apache.tomcat.util.http.parser.Host.parse(Host.java:71)
org.apache.tomcat.util.http.parser.Host.parse(Host.java:45)
org.apache.coyote.AbstractProcessor.parseHost(AbstractProcessor.java:294)
org.apache.coyote.http11.Http11Processor.prepareRequest(Http11Processor.java:776)
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:349)
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594)
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.base/java.lang.Thread.run(Thread.java:829)
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upstream mgr_upstream {
server 127.0.0.1:8989;
}
server {
listen 80;
server_name localhost;
location / {
root html;
index index.html index.htm;
}
location /mgr {
proxy_pass http://mgr_upstream/mgr;
}
...
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解决办法：
将配置文件内的 upstream 的名称中的下划线去掉即可。
upstream mgrupstream {
server 127.0.0.1:8989;
}
server {
listen 80;
server_name localhost;
location / {
root html;
index index.html index.htm;
}
location /mgr {
proxy_pass http://mgrupstream/mgr;
}
...
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原因：
Tomcat版本问题。
