Node 0.8.x cluster module usage with @substack's bouncy module using CLI example for req.on('error').

cluster-with-bouncy.js

// # cluster-with-bouncy

var cluster  = require('cluster')
  , numCPUS  = require('os').cpus().length
  , bouncy   = require('bouncy')
  , sites    = require('./sites')

if (cluster.isMaster) {

  // fork workers
  for(var i=0; i < numCPUS; i+=1) {
    cluster.fork()
  }

  // exit
  cluster.on('exit', clusterExit)

} else {
  // bouncy workers
  bouncy(bounceWorker).listen(80)
}

function processMsg(msg) {
  console.log('msg', msg)
}

function clusterExit(worker, code, signal) {
  console.log('worker %s died', worker.process.pid)
}

function bounceWorker(req, bounce) {

  req.on('error', bounceError)

  var host  = (req.headers.host || '').replace(/:\d+$/, '')
    , route = sites[host] || 8080

  bounce(route).on('error', bounceError)

  function bounceError(err) {
    var res = bounce.respond()
    res.statusCode = 500
    res.end('error\r\n')
  }

}