code: def get_requests_request_name(self, request_name):
          
          query_parameters = {}
          if request_name is not None:
              query_parameters['requestName'] = self._serialize.query('request_name', request_name, 'str')
          response = self._send(http_method='GET',
                                location_id='ebc09fe3-1b20-4667-abc5-f2b60fe8de52',
                                version='5.0-preview.1',
                                query_parameters=query_parameters)
          return self._deserialize('Request', response)
docs: GetRequestsRequestName.
          [Preview API] Get a symbol request by request name.
          :param str request_name:
          :rtype: :class:`<Request> <azure.devops.v5_0.symbol.models.Request>`