code: def get_cookie(self, key, default=None, secret=None):
          
          value = self.cookies.get(key)
          if secret and value:
              dec = cookie_decode(value, secret) # (key, value) tuple or None
              return dec[1] if dec and dec[0] == key else default
          return value or default
docs: Return the content of a cookie. To read a `Signed Cookie`, the
              `secret` must match the one used to create the cookie (see
              :meth:`BaseResponse.set_cookie`). If anything goes wrong (missing
              cookie or wrong signature), return a default value.