Give user ability to choose use websocket message type or not

[trunglebka]

Related to: How to determine whether the received PACKET is binary or text?
I have to use translation to read you all comment, please correct me if any misunderstood.
In the previous comment you say that "Websocket callback does not give the frame type" and the recommended way is via URL. But with complicated applications that require control message (Ex. Json) to control the server and binary to send data, what is your recommended way to overcome this limit? Create new endpoint to control the same service is complicating client code, isn't it?