Update main.py

main.py

@@ -36,7 +36,7 @@ def root():
 async def webhook(request: Request, x_line_signature: str = Header(None)):
     body = await request.body()
     try:
-        line_handler.handle(body.decode("utf-8"), x_line_signature)
+        line_handler.handle(body.decode(), x_line_signature)
     except InvalidSignatureError:
         raise HTTPException(status_code=400, detail="chatbot handle body error.")
     return 'OK'