code: function handleUpdate(req, res) {
  	var id = req.params.id;
  	var value = req.params.value;
  	addCache(id, value);
  	data = {id:id, value:value};
  	console.log('Update:', id, value, data);
  	io.sockets.emit('update', data);	// or broadcastJSONUpdate
  	res.send(value);
  }
docs: ////////  Receive JSON updates via POST /update/id/value