title: Unable to handle exception with node.js domains using express
body: <p>I want to use Node.js Domains to catch exceptions.  It is working so far, but there is one place I can't get domains to catch the exception.  exception2 in the callback is caught and handled in the domain.on('error') handler, but exception1 is not caught.  The odd thing is that when exception1 is thrown, it doesn't shutdown Node like I would expect.  Here is my example app:</p>
  
  <pre><code>var domain = require('domain');
  var request = require('request');
  var express = require('express');
  
  var serverDomain = domain.create();
  serverDomain.on('error', function(err) {
    console.log("Server Domain Error: " + err);
  });
  
  var app;
  
  serverDomain.run(function() {
    app = express();
    app.listen(3000);
  });
  
  app.use(function(req, res, next) {
  
    var reqDomain = domain.create();
    reqDomain.add(req);
    reqDomain.add(res);
    reqDomain.on('error', function(err) {
      console.log("Req Domain Error: " + err);
      reqDomain.dispose();
      next(err);
    });
  
    next();
  });
  
  app.get('/', function(req, res) {
    var uri = "http://google.com";
  
    exception1.go();
  
    request.get({url:uri, json: {}},
      function (error, response, body) {
        if(response.statusCode === 200) {
          exception2.go();
          res.send('Success getting google response');
        }
      });
  });
  </code></pre>
  
  <p>To get exception2 to execute, I comment out exception 1.</p>