ashb commented on code in PR #51699:
URL: https://github.com/apache/airflow/pull/51699#discussion_r2151842567


##########
airflow-core/src/airflow/dag_processing/processor.py:
##########
@@ -266,20 +263,18 @@ def _on_child_started(
         msg = DagFileParseRequest(
             file=os.fspath(path),
             bundle_path=bundle_path,
-            requests_fd=self._requests_fd,
             callback_requests=callbacks,
         )
-        self.send_msg(msg)
+        self.send_msg(msg, request_id=0)
 
-    def _handle_request(self, msg: ToManager, log: FilteringBoundLogger) -> 
None:  # type: ignore[override]
+    def _handle_request(self, msg: ToManager, log: FilteringBoundLogger, 
req_id: int) -> None:  # type: ignore[override]
         from airflow.sdk.api.datamodels._generated import ConnectionResponse, 
VariableResponse
 
         resp: BaseModel | None = None
         dump_opts = {}
         if isinstance(msg, DagFileParsingResult):
             self.parsing_result = msg
-            return
-        if isinstance(msg, GetConnection):
+        elif isinstance(msg, GetConnection):

Review Comment:
   It is correct. Part of the change in this is that _every_ message must send 
a response, even if that response is empty. (It's wrapped up in a 
`_ResponseFrame`, where body can be None by`self.send_msg`. But we must send 
something)



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