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I know it seems a duplicate question from this thread Is it possible to call a SignalR Hub from Postman, but I already know that it is possible, after Postman version > 8.0 using WebSocket Request block. But I can not find any good example of how to do it.

I can connect to my hub via Postman, just by passing the hub Url like this:

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But I don't know how can I call the hub method and pass the parameters. Currently, my client program.cs code calls

await hubConnection.InvokeAsync("GetTrades", _username);

and my connection.On:

hubConnection.On<Trade>("ReceiveTrades", (trade) =>
{
    var tradeAsJson = JsonConvert.SerializeObject(trade);
    Console.WriteLine($"Trade received: {tradeAsJson}");
});

How it would be to represent this calls from postman?

Gabriel Ribeiro
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2 Answers2

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I create a sample project with signalR, you can download it from github. We can open site with https://localhost:44381.

Tips: please replace SignalR_ConnectionString in appsettings.json.

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And if we want connect to signalR hub, we can use postman, you can follow the steps like below picture.

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use wss://localhost:44381/chatHub.

enter image description here

enter image description here

Jason Pan
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    But how can you call your server method? That's the point. I can also connect to my hub, but I can not call my method "GetTrades", passing a username (string) as a parameter – Gabriel Ribeiro Sep 30 '21 at 13:23
  • https://github.com/dotnet/aspnetcore/blob/main/src/SignalR/docs/specs/HubProtocol.md#json-encoding – Anton Toshik Oct 07 '21 at 22:30
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After establishing the connection put this object in the "Message" area and hit send:

{"arguments":["username", "token"],"invocationId":"0","target":"Your Method","type":1}
  • arguments: include all your parameters here.
  • target: put the method name you want to call
Aziz
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