I have a Cookie acting as a UUID for a user login. It is set to expire one year after creation. At the moment I ask for the value of that Cookie and it returns the text. If it returns a blank I know that no Cookie exists, so I create one. But
Once the Cookie expires in a year, is the cookie removed automatically? Does it still exist but now returns blank? Do I need to delete it? Can I create a new Cookie over the top of an existing Cookie (assuming it still exists, but is blank)?