gistfile1.js

// Add a CLF logger
function logCLF(req, res) {
  var log = [
    req.connection.remoteAddress, // client IP
    '-',  // RFC 1413 identity
    '-',  // user id
    '[' + new Date().toUTCString() + ']', // date
    '"' + req.method + ' ' + req.url + '"', // request line
    res.statusCode,  // response code
    '-'   // response size (bytes)
    ];
  sys.puts(log.join('\t'));
}

server.addListener('request', function(req, res) {
  if (res.finished) {
    logCLF(req, res);
  } else {
    res.addListener('close', function(res) {
      logCLF(req, res);
    });
  }
});