code: def _set_error_handler_callbacks(self, app):
          
          @app.errorhandler(NoAuthorizationError)
          def handle_no_auth_error(e):
              return self._unauthorized_callback(str(e))
  
          @app.errorhandler(InvalidHeaderError)
          def handle_invalid_header_error(e):
              return self._invalid_token_callback(str(e))
  
          @app.errorhandler(jwt.ExpiredSignatureError)
          def handle_expired_error(e):
              return self._expired_token_callback()
  
          @app.errorhandler(jwt.InvalidTokenError)
          def handle_invalid_token_error(e):
              return self._invalid_token_callback(str(e))
docs: Sets the error handler callbacks used by this extension