Why I am getting the exception of operation not supported in WCF test client in C#?

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C#

WCF

WebSocket-server

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I am getting the exception of operation not supported in WCF Test Client. I am trying to set a Client Server Communication over the Web Socket.

Server Side I have set a WCF Service but on running the svc file I am getting the error mentioned

"Operation not Supported in WCF Test Client"

What I have tried:

Below is the WCF configuration file

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <system.serviceModel>
        <bindings>
            <netHttpBinding>
                <binding name="NetHttpBinding_IHelloService" sendTimeout="00:05:00">
                    <webSocketSettings transportUsage="Always" />
                </binding>
            </netHttpBinding>
        </bindings>
        <client>
            <endpoint address="ws://localhost:61992/HelloService.svc" binding="netHttpBinding"
                bindingConfiguration="NetHttpBinding_IHelloService" contract="IHelloService"
                name="NetHttpBinding_IHelloService">
                <identity>
                    <dns value="localhost" />
                </identity>
            </endpoint>
        </client>
    </system.serviceModel>
</configuration>