Tomcat的header缓冲区大小不够
1.只需要在server.xml中增加maxHttpHeaderSize字段即可:
<Connector URIEncoding="UTF-8" port="8080" protocol="org.apache.coyote.http11.Http11NioProtocol"
useBodyEncodingForURI="false"
enableLookups="false"
connectionTimeout="20000"
redirectPort="8443" maxHttpHeaderSize="3145728"/>
