revert some sstuff

handler.py

@@ -7,9 +7,10 @@ class EndpointHandler:
     _instance = None  # Singleton instance
     _model_loaded = False  # Flag to check if the model is loaded
 
-    def __new__(cls):
+    def __new__(cls, *args, **kwargs):
         if not cls._instance:
-            cls._instance = super(EndpointHandler, cls).__new__(cls)
+            cls._instance = super(EndpointHandler, cls).__new__(cls, *args, **kwargs)
+            cls._instance._model_loaded = False
         return cls._instance
 
     def __init__(self, model_path=""):
@@ -105,5 +106,12 @@ def main():
     result_str = handler(data_str)
     print("String input result:", result_str)
 
+    # Test 3: Invalid input type
+    data_invalid = 123
+    try:
+        handler(data_invalid)
+    except ValueError as e:
+        print("Invalid input type error:", e)
+
 if __name__ == "__main__":
     main()