Update app.py

app.py

@@ -224,7 +224,7 @@ async def chat(
 class ChatRequest(BaseModel):
     q: str
     model: str = "gpt-4o-mini"
-    history: List[Dict[str, str]] = None
+    history: List[Dict[str, str]] = []
     proxy: Optional[str] = None
 
 @app.post("/api/chat-post")
@@ -232,9 +232,7 @@ async def chat(request: ChatRequest):
     """Perform a text search."""
     try:
         with WEBS(proxy=request.proxy) as webs:
-            chat_messages = []
-            if request.history:
-                chat_messages.extend(request.history)
+            chat_messages = request.history
             chat_messages.append({"role": "user", "content": request.q})
             results = webs.chat(chat_messages = chat_messages, model=request.model)
             return JSONResponse(content=jsonable_encoder(results))