troubleshoot chatui

app/main.py

@@ -1,10 +1,14 @@
-from fastapi import FastAPI
+from fastapi import FastAPI, Request
 from langserve import add_routes
 from langchain_core.runnables import RunnableLambda
 from pydantic import BaseModel
 from typing import List, Literal, Optional, Dict, Any
 import gradio as gr
 from datetime import datetime
+import logging
+
+# Set up logging
+logger = logging.getLogger(__name__)
 
 # ─────────────────────────────────────────
 # Schemas