nginx proxy arrangement direction Error The character [_] is never valid in a domain name

nginx proxy arrangement direction Error The character [_] is never valid in a domain name

Here is the configuration information:

The reason is tomcat used for the following upstream names have _ 8 and above versions, tomcat7 not appear. _ To remove the tomcat_server.

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Origin www.cnblogs.com/xiangxinhouse/p/12050966.html