// Sends a message once a second 10 times
var app = function(request) {
  return function(responder) {
    var i = 0;
    var w = responder(200, {});

    var intervalId = serInterval(function(){
      w.write("Every second another message");
      if (++i == 10) {
        w.close();
        clearInterval(intervalId);
      }
    }, 1000);
  };
}