fix/issue-67945: Adding warning message to execute_async method

providers/http/src/airflow/providers/http/operators/http.py

@@ -209,6 +209,12 @@ def paginate_sync(self, response: Response) -> Response | list[Response]:
         return all_responses
 
     def execute_async(self, context: Context) -> None:
+        if self.method.upper() not in ("GET", "HEAD", "OPTIONS"):
+            self.log.warning(
+                "HttpOperator with deferrable=True and method=%s may send duplicate requests if the Triggerer restarts.",
+                self.method,
+            )
+
         self.defer(
             trigger=HttpTrigger(
                 http_conn_id=self.http_conn_id,

providers/http/tests/unit/http/operators/test_http.py

@@ -387,3 +387,33 @@ def __init__(self, *_, **__): ...
             base.BaseHook, "get_connection", lambda _cid: SimpleNamespace(login=None, password=None)
         )
         assert HttpOperator(task_id="test_HTTP_op_3")._resolve_auth_type() is None
+
+    @pytest.mark.parametrize("method", ["POST", "PUT", "PATCH", "DELETE"])
+    def test_execute_async_warns_on_non_idempotent_method(self, monkeypatch, method):
+        monkeypatch.setattr(
+            base.BaseHook, "get_connection", lambda _cid: SimpleNamespace(login=None, password=None)
+        )
+        self._capture_defer(monkeypatch)
+
+        operator = HttpOperator(task_id="test_HTTP_op", method=method, deferrable=True)
+
+        with mock.patch.object(operator.log, "warning") as mock_warning:
+            operator.execute_async(context={})
+
+        mock_warning.assert_called_once()
+        call_args = mock_warning.call_args
+        assert method in call_args.args or method in str(call_args)
+
+    @pytest.mark.parametrize("method", ["GET", "HEAD", "OPTIONS"])
+    def test_execute_async_no_warning_on_idempotent_method(self, monkeypatch, method):
+        monkeypatch.setattr(
+            base.BaseHook, "get_connection", lambda _cid: SimpleNamespace(login=None, password=None)
+        )
+        self._capture_defer(monkeypatch)
+
+        operator = HttpOperator(task_id="test_HTTP_op", method=method, deferrable=True)
+
+        with mock.patch.object(operator.log, "warning") as mock_warning:
+            operator.execute_async(context={})
+
+        mock_warning.assert_not_called()