Angular/SignalR Error: Failed to complete negotiation with the server

by 
connection = new signalR.HubConnectionBuilder()
    .configureLogging(signalR.LogLevel.Debug)
    .withUrl("http://localhost:5000/decisionHub", {
      skipNegotiation: true,
      transport: signalR.HttpTransportType.WebSockets
    })
    .build();

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