This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori 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.