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	config := xrpl.ClientConfig{
		URL: "wss://s.altnet.rippletest.net:51233/",
	}
	client := xrpl.NewClient(config)
	err := client.Ping([]byte("PING"))
	if err != nil {
		panic(err)
	}

        // test send request after close
       r.Close()
	
	resp, err := client.Request(xrpl.BaseRequest{
		"id":           "example_ledger_req",
		"command":      "ledger",
		"ledger_index": "validated",
		"transactions": false,
		"expand":       false,
		"owner_funds":  false,
	})
	if err != nil {
		panic(err)
	}

	var ok bool
	index, ok = (resp["result"].(map[string]interface{})["ledger_index"]).(float64)
	if !ok {
		fmt.Printf("ledger_index reflect failed: %T", index)
	}
	

	config := xrpl.ClientConfig{
		URL: "wss://s.altnet.rippletest.net:51233/",
	}
	client := xrpl.NewClient(config)
	err := client.Ping([]byte("PING"))
	if err != nil {
		panic(err)
	}

        // 1st
       r.Close()
       
       // 2nd
       r.Close() // will be lock in this close

$ ./bin/platform-server
2023/12/19 11:21:46 Loading configuration file: .env
2023/12/19 11:21:46 WS connection error: ws://localhost:6006 dial tcp 127.0.0.1:6006: connect: connection refused
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0x94522a]

goroutine 1 [running]:
github.com/gorilla/websocket.(*Conn).WriteMessage(0x18?, 0xc0001708e8?, {0xc0001708e8, 0x13, 0x18})
...
...