TOMCAT note:further occurrences of HTTP header parsing errors would be logged at DEBUG level.

December 31, 2014 2:32:45 pm Org.apache.coyote.http11.AbstractHttp11Processor Process
Info: Error parsing HTTP Request Header
Note:further occurrences of HTTP header parsing errors'll be logged at DEBUG level.

After debugging, it is found that Tomcat's header buffer size is not enough, only need to add the Maxhttpheadersize field in Server.xml:

<connector uriencoding= "UTF-8" port= "8080" protocol= "Org.apache.coyote.http11.Http11NioProtocol" Usebodyencodingforuri= "false" enablelookups= "false"               connectiontimeout= "20000"               redirectport= "8443" Maxhttpheadersize= "The size you want"/>

However, this problem does not occur with Web submissions, even if the phone repeatedly emphasizes the use of post, and is still suspected because the use of the get causes the header data to be too long.

TOMCAT note:further occurrences of HTTP header parsing errors would be logged at DEBUG level.