jscheffl commented on code in PR #45344:
URL: https://github.com/apache/airflow/pull/45344#discussion_r1900712952


##########
task_sdk/src/airflow/sdk/execution_time/supervisor.py:
##########
@@ -726,7 +727,12 @@ def _handle_request(self, msg: ToSupervisor, log: 
FilteringBoundLogger):
             resp = var_result.model_dump_json().encode()
         elif isinstance(msg, GetXCom):
             xcom = self.client.xcoms.get(msg.dag_id, msg.run_id, msg.task_id, 
msg.key, msg.map_index)
-            xcom_result = XComResult.from_xcom_response(xcom)
+            if isinstance(xcom, XComResponse):
+                xcom_result = XComResult.from_xcom_response(xcom)
+            else:
+                # Airflow 2.x just ignores the absence of an XCom and moves on 
with a return value of None
+                # Hence making this resp with key as `key` and value as None, 
so that the message is sent back to task runner.
+                xcom_result = 
XComResult.from_xcom_response(XComResponse(key=msg.key, value=None))

Review Comment:
   Why are you not "just" moving the fallback handling into 
task_sdk/src/airflow/sdk/api/client.py but return an ErrorReponse which then 
later needs to be converted? Is this not over-complicating?



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