Tomcat logs frequent 400s in the access log from traffic on the https port

Solution Unverified - Updated -

Issue

  • After upgrading to Tomcat 9, we see access log entries like below for 400 responses without any request details:
10.xx.xx.x [09/Jul/2020:04:25:35 +0000] - 10.xx.xx.x null cookie:- request:- null null 400 - 0
  • This is seen repeatedly when we have a TCP probes hitting our https port as a healthcheck

Environment

  • JBoss Web Server (JWS) 5.x
    • Tomcat 9.0.x

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