原因:定位到../conf/server.xml中
<Connector port="8020" protocol="org.apache.coyote.http11.Http11NioProtocol"
executor="tomcatThreadPool"
connectionTimeout="20000"
URIEncoding="UTF-8"
enableLookups="false"
redirectPort="8443"
disableUploadTimeout="true" />
修改上面代码为:
<Connector port="8020" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
问题解决