Return error to client with Node.js domains

Question

I read that using domains is proper way of handling unhandled exceptions, but I don't know how to notify the end user for this error. I don't want this error to be unnoticed by the end user, I want to show them an error message.

My current code is like:

var domain = require('domain').create();

domain.on('error', function(err) {
  console.error('Unhandled exception occured:\n', err.stack.toString());

  // Don't know how to access the response (nor request) object here so I can return error
  // res.json({error:'Error ocurred'});
});

domain.run(function() {
// Here is complete logic including definition of http server 
...
});