How to Connect to localhost:55400 (daemon Websocket) by Postman?

I am trying to Connect to Chia daemon at localhost:55400 by Postman Websocket. Any Help ?

I want to Subscribe/Register Service to different events.

When I click on Connect then Error Displayed Can’t connect to server.

You’ll likely be able to get better help from the Developers Forum here: https://developers.chia.net/

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Have you tried it without the trailing slash (/) after the port number ?

You need to pass the client certificate for authentification.
You find the client certificate and key in your chia user folder.

If you are using c# i would recommend using my nuget package