code: def get_secure_cookie(
          self,
          name: str,
          value: str = None,
          max_age_days: int = 31,
          min_version: int = None,
      ) -> Optional[bytes]:
          
          self.require_setting("cookie_secret", "secure cookies")
          if value is None:
              value = self.get_cookie(name)
          return decode_signed_value(
              self.application.settings["cookie_secret"],
              name,
              value,
              max_age_days=max_age_days,
              min_version=min_version,
          )
docs: Returns the given signed cookie if it validates, or None.
  
          The decoded cookie value is returned as a byte string (unlike
          `get_cookie`).
  
          Similar to `get_cookie`, this method only returns cookies that
          were present in the request. It does not see outgoing cookies set by
          `set_secure_cookie` in this handler.
  
          .. versionchanged:: 3.2.1
  
             Added the ``min_version`` argument.  Introduced cookie version 2;
             both versions 1 and 2 are accepted by default.