code: def get_cookie(self, key, 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 None
          return value or None
docs: Return the content of a cookie. To read a `Signed Cookies`, use the
              same `secret` as used to create the cookie (see
              :meth:`Response.set_cookie`). If anything goes wrong, None is
              returned.