вам нужно использовать метод xcom_pull в контексте:
http_task = SimpleHttpOperator(
task_id='http_call',
endpoint='nodes/url',
data="name=Joe",
headers={"Content-Type": "application/x-www-form-urlencoded"},
dag=dag,
)
def get_http_payload(**context):
http_payload = ['ti'].xcom_pull(task_ids='http_call')
print(http_payload)
process_output = PythonOperator(
task_id='process_stuff',
python_callable=get_http_payload,
provide_context=True,
dag=dag,
)
http_task >> process_output