Express error handling

  router.get('/', function (request, response, next) {
    if (request.query.next) {
      // Properly handled by Express
      next(new Error('Error that I nexted'));
    }
    else if (request.query['throw']) {
      // Properly handled by Express
      throw new Error('Error that I threw');
    }
    else if (request.query.asyncNext) {
      // Properly handled by Express
      process.nextTick(function () {
        next(new Error('Error that I nexted asynchronously'));
      });
    }
    else if (request.query.asyncThrow) {
      // Not even seen by Express
      process.nextTick(function () {
        throw new Error('Error that I threw asynchronously');
      });
    }
    else {
      response.status(500).send('FAIL');
    }
  });