Enhance robustness

examples/streaming_web/backend/utils.py

@@ -362,7 +362,8 @@ def verify_localhost(request: Request) -> None:
         Raises:
             HTTPException: If the request is not made from localhost.
         """
-        if request.client.host not in ['127.0.0.1', '::1']:
+        client = request.client
+        if client is None or client.host not in ['127.0.0.1', '::1']:
             raise HTTPException(
                 status_code=403,
                 detail='Access is restricted to localhost only.',

tests/examples/streaming_web/backend/app_test.py

@@ -101,25 +101,28 @@ def test_app_running_configuration(
         )
 
     @patch(
-        "examples.streaming_web.backend.app.redis_manager.client",
+        'examples.streaming_web.backend.app.redis_manager.client',
         new_callable=AsyncMock,
     )
     @patch(
-        "examples.streaming_web.backend.app.FastAPILimiter.init",
+        'examples.streaming_web.backend.app.FastAPILimiter.init',
         new_callable=AsyncMock,
     )
-    def test_lifespan_events(self, mock_limiter_init: AsyncMock, mock_redis_client: AsyncMock) -> None:
+    def test_lifespan_events(
+        self,
+        mock_limiter_init: AsyncMock,
+        mock_redis_client: AsyncMock,
+    ) -> None:
         """
         Test that the lifespan events are properly handled.
         """
         with TestClient(app_module.app) as client:
-            response = client.get("/")
+            response = client.get('/')
             # 驗證返回的狀態碼是 404
             self.assertEqual(response.status_code, 404)
         mock_limiter_init.assert_called_once_with(mock_redis_client)
         mock_redis_client.close.assert_called_once()
 
-
     def tearDown(self) -> None:
         del self.client