TCAT-AS-000920 - ErrorReportValve showServerInfo must be set to false.
Information
The Error Report Valve is a simple error handler for HTTP status codes that will generate and return HTML error pages. It can also be configured to return pre-defined static HTML pages for specific status codes and/or exception types. Disabling showServerInfo will only return the HTTP status code and remove all CSS from the default non-error related HTTP responses.
Solution
As a privileged user on the Tomcat server: Edit the $CATALINA_BASE/conf/server.xml file. Create or modify an ErrorReportValve <Valve> element nested beneath each <Host> element. EXAMPLE: <Host name='localhost' appBase='webapps' unpackWARs='true' autoDeploy='false'> ... <Valve className='org.apache.catalina.valves.ErrorReportValve' showServerInfo='false' /> ... </Host> Restart the Tomcat server: sudo systemctl restart tomcat sudo systemctl daemon-reload