Tomcat localhost access log does not contain failed requests
If you want to log the connection details, you need to increase to log levels of loggers org.apache.coyote and org.apache.tomcat.util.net, by putting:
org.apache.tomcat.util.net.level = FINE
org.apache.coyote.level = FINE
in $CATALINA_BASE/conf/logging.properties and increasing the log level of some handler, e.g.:
java.util.logging.ConsoleHandler.level = FINE
whose messages eventually end up in catalina.out.
This requires a server restart. You should be able to do the same thing through JMX (e.g. jconsole), without a restart.