c# Blazor Wasm Check API for Connection Refused

i've an blazor component with the following code:

@using System.Net
@inject IConfiguration conf
@inject HttpClient Http
@inject NavigationManager navMgr

@{
    checkBackend();
}

@code {

    private async void checkBackend() {
        try {
            var response = await Http.GetAsync(conf.GetSection("AppSettings:ApiHost").Value + "/ping");

            if(response==null) {
                throw new ApplicationException("API-Host unreachable..");
            }
        
            if (!response.IsSuccessStatusCode)
            {
                var statusCode = response.StatusCode;
                var content = await response.Content.ReadAsStringAsync();
                switch (statusCode)
                {
                    case HttpStatusCode.NotFound: navMgr.NavigateTo("/Error/404"); 
                        break;
                    case HttpStatusCode.Unauthorized: navMgr.NavigateTo("/Error/Unauthorized"); 
                        break;
                    default: navMgr.NavigateTo("/Error/500"); 
                        break;
                }
                throw new ApplicationException($"Reason: {response.ReasonPhrase}"); //or add a custom logic here
            }
        } catch(HttpRequestException ex) {
            throw new ApplicationException(ex.Message.ToString());
        }
        
    }
}

i've added this component into my Blazor page.

Now, when i shut down my API server and run my Blazor app, i even get this error.

Console Error

My Question is: Is there any way to catch this error?