def _query_server_state(self, conn, file_length):
        # Send an empty PUT so that server replies with this resumable
        # transfer's state.
        put_headers = {}
        put_headers['Content-Range'] = (
            self._build_content_range_header('*', file_length))
        put_headers['Content-Length'] = '0'
        return AWSAuthConnection.make_request(conn, 'PUT',
                                              path=self.tracker_uri_path,
                                              auth_path=self.tracker_uri_path,
                                              headers=put_headers,
                                              host=self.tracker_uri_host)
Queries server to find out state of given upload.
dataset/ETHPy150Open radlab/sparrow/deploy/third_party/boto-2.1.1/boto/gs/resumable_upload_handler.py/ResumableUploadHandler._query_server_state