Here is my code.
session = clearml.backend_api.Session() url = r"{}/{}".format(session.get_api_server_host(), "tasks.get_all") payload = { 'only_fields' : ["id", "name", "project", "completed", "user"], 'page' : 0, 'page_size' : 5, 'scroll_id' : 1, 'order_by' : [ 'completed' ] } response = requests.post(url, data=json.dumps(payload), auth=(session.access_key, session.secret_key)) response.json()and response.json() shows
{'meta': {'id': 'd61c02a39a394d0a933c34a871747313', 'trx': 'd61c02a39a394d0a933c34a871747313', 'endpoint': {'name': 'tasks.get_all', 'requested_version': '2.18', 'actual_version': '1.0'}, 'result_code': 400, 'result_subcode': 12, 'result_msg': 'Validation error (Integer size parameter greater than 1 should be provided when working with scroll)', 'error_stack': None, 'error_data': {}}, 'data': {}}