This week's book giveaway is in the Java in General forum. We're giving away four copies of Think Java: How to Think Like a Computer Scientist and have Allen B. Downey & Chris Mayfield on-line! See this thread for details.
If you turn on access logging (uncomment its entry in server.xml) you'll have a typical log that can be parsed with programs like webalizer. This has log entries for every hit, including the response code.