How to fetch last traded price without sdk

[Abhilash7]

@Abhilash7

Invalid argument(s): Unsupported scheme ‘wss’ in URI wss://wsportfolioupdate-api.upstox.com/portfolio-stream-feeder/v2/upstox-developer-api/feeds?requestId=db20733e-6e10-4ba3-9eb0-285184e2f534&code=UBC05-3b7aa7c9-ee8c-469f-920c-98ae138925f6 this is the error iam getting when connecting websocket(endpoints) in flutter

iam getting this error when tried and when i tested in postman iam not getting any data but it is getting connected.