Delete_cookie_alternatives.md

Set cookie to "empty" value at logout:

expires = datetime.datetime.utcnow()
self.response.set_cookie(key="uid", value="empty", expires=expires)

Check for "empty" in checkcookie:

def checkcookie(self, cookie_vrednost):
    if cookie_vrednost == "empty":
        return False
    else:
        user_id, code, expires_ts = cookie_vrednost.split(":")
        
        if datetime.datetime.utcfromtimestamp(float(expires_ts)) > datetime.datetime.now():
            check = hmac.new(str(user_id), str(secret) + str(expires_ts), hashlib.sha1).hexdigest()
        
            if code == check:
                return True
            else:
                return False
        else:
            return False