Detect Online Users using Circuit Handler in ASP.NET Blazor Server

public class UserCircuitHandler : CircuitHandler
{
    private readonly IHttpContextAccessor _httpContextAccessor;

    public UserCircuitHandler(IHttpContextAccessor httpContextAccessor)
    {
        _httpContextAccessor = httpContextAccessor;
    }

    public override async Task OnConnectionUpAsync(Circuit circuit,
        CancellationToken cancellationToken)
    {
        var httpContext = _httpContextAccessor.HttpContext;
        var userAgent = httpContext.Request.Headers["User-Agent"];
        string uaString = userAgent.ToString();
        var uaParser = Parser.GetDefault();
        ClientInfo c = uaParser.Parse(uaString);
        Console.WriteLine(httpContext.User.Identity.Name);
    }

    public override async Task OnConnectionDownAsync(Circuit circuit,
        CancellationToken cancellationToken)
    {
        var httpContext = _httpContextAccessor.HttpContext;
        var userAgent = httpContext.Request.Headers["User-Agent"];
        string uaString = userAgent.ToString();
        var uaParser = Parser.GetDefault();
        ClientInfo c = uaParser.Parse(uaString);
        Console.WriteLine(httpContext.User.Identity.Name);
    }
}

References
https://learn.microsoft.com/en-us/aspnet/core/blazor/fundamentals/signalr?view=aspnetcore-7.0#blazor-server-circuit-handler
https://learn.microsoft.com/en-us/aspnet/core/blazor/security/server/additional-scenarios?view=aspnetcore-7.0#circuit-handler-to-capture-users-for-custom-services

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