code: def get_cookie(self, key, default=None, secret=None, digestmod=hashlib.sha256):
          
          value = self.cookies.get(key)
          if secret:
              # See BaseResponse.set_cookie for details on signed cookies.
              if value and value.startswith('!') and '?' in value:
                  sig, msg = map(tob, value[1:].split('?', 1))
                  hash = hmac.new(tob(secret), msg, digestmod=digestmod).digest()
                  if _lscmp(sig, base64.b64encode(hash)):
                      dst = pickle.loads(base64.b64decode(msg))
                      if dst and dst[0] == key:
                          return dst[1]
              return 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.