Information
The access logfile format is defined within a Valve that implements the org.apache.catalina.valves.AccessLogValve interface within the /opt/tomcat/server.xml configuration file: The "%r" pattern code is included in the pattern element and logs the first line associated with the event, namely the request method, URL path, query string, and protocol ('"' simply specifies a literal double quote). Including the pattern in the log configuration provides useful information about the time of the event which is critical for troubleshooting and forensic investigations.
Solution
As a privileged user on the Tomcat server:
Edit the $CATALINA_BASE/conf/server.xml file.
Modify the <Valve> element(s) nested within the <Host> element(s).
Change the AccessLogValve setting to include "%r" in the pattern= statement.
EXAMPLE:
<Host name='localhost' appBase='webapps'
unpackWARs='true' autoDeploy='false'>
...
<Valve className='org.apache.catalina.valves.AccessLogValve' directory='logs'
prefix='localhost_access_log' suffix='.txt'
pattern='%h %l %t %u "%r" %s %b' />
...
</Host>
Restart the Tomcat server:
sudo systemctl restart tomcat
sudo systemctl daemon-reload