Update app.py

app.py

@@ -29,7 +29,7 @@ def generate_response(endpoint, api_key, model, user_prompt):
             client = OpenAI(api_key=api_key, base_url=endpoint)
             system_prompt_path = __file__.replace("app.py", "json.txt")
         else:
-            print("Invalid API key")
+            print(f"Invalid API key: {api_key}")
             return "Invalid API key", "Invalid API key", None
     else:
         if model in claude_models: