code: def get_requests_request_id(self, request_id):
          
          route_values = {}
          if request_id is not None:
              route_values['requestId'] = self._serialize.url('request_id', request_id, 'str')
          response = self._send(http_method='GET',
                                location_id='ebc09fe3-1b20-4667-abc5-f2b60fe8de52',
                                version='5.0-preview.1',
                                route_values=route_values)
          return self._deserialize('Request', response)
docs: GetRequestsRequestId.
          [Preview API] Get a symbol request by request identifier.
          :param str request_id: The symbol request identifier.
          :rtype: :class:`<Request> <azure.devops.v5_0.symbol.models.Request>`