Update app.py

app.py

@@ -223,7 +223,7 @@ async def chat(
 # Define a Pydantic model for the request payload
 class ChatRequest(BaseModel):
     q: str
-    history: str = "[]"
+    history
     model: str = "gpt-4o-mini"
     proxy: Optional[str] = None
 
@@ -233,7 +233,8 @@ async def chat(request: ChatRequest):
     try:
         with WEBS(proxy=request.proxy) as webs:
             chat_messages = []
-            chat_messages.extend(ast.literal_eval(request.history))
+            if request.history:
+                chat_messages.extend(ast.literal_eval(str(request.history)))
             results = webs.chat(keywords=request.q, chat_messages = chat_messages, model=request.model)
             return JSONResponse(content=jsonable_encoder(results))
     except Exception as e: