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WebSocket: Create websocket connection to server
As WebSocket protocol works via HTTP, to initiate a WebSocket connection to the server, you need to setup and use an instance TElHTTPSClient. Creation of a WebSocket is done using TElHTTPSClient.StartWS() method and pass it the URL on the server which will accept the connection and establish a WebSocket. The method returns an instance of TElWebSocketClient, used to communicate with a server, and TElSocket object, that represents a connection to use for further data exchange. TElSocket is used to detect availability of the incoming data.