How to Turn on Detailed Exceptions in CircuitOptions.DetailedErrors with server-side Blazor

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//Startup.cs
public class Startup
{
        -public Startup(IConfiguration configuration)
        +public Startup(IConfiguration configuration, IWebHostEnvironment env)
        {
            Configuration = configuration;
           + _env = env;
        }

        public IConfiguration Configuration { get; }
        +private readonly IWebHostEnvironment _env;
 
}

//Startup.cs

public void ConfigureServices(IServiceCollection services)
{
  services.AddRazorPages();
   services.AddServerSideBlazor()
                .AddCircuitOptions(options =>
                {
                    

                    if (_env.IsDevelopment()) //only add details when debugging
                    {
                        options.DetailedErrors = true;
                    }
                });
}

[2019-12-14T15:51:13.199Z] Error: System.Net.Http.HttpRequestException: Response status code does not indicate success: 404 (Not Found).
   at System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode()
   at System.Net.Http.HttpClient.GetStringAsyncCore(Task`1 getTask)
   at Microsoft.AspNetCore.Components.HttpClientJsonExtensions.GetJsonAsync[T](HttpClient httpClient, String requestUri)
   at Stockso.BlazorServer.Pages.WebAPI.v1.StockDataPhysicalDiskPanKouAggregateAuctionSearch.OnInitializedAsync() in x\src\BlazorServer\Stockso.BlazorServer\Pages\WebAPI\v1\StockDataPhysicalDiskPanKouAggregateAuctionSearch.razor:line 172
   at Microsoft.AspNetCore.Components.ComponentBase.RunInitAndSetParametersAsync()
   at Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask(Task taskToHandle)

Error: There was an unhandled exception on the current circuit, so this circuit will be terminated. For more details turn on detailed exceptions in 'CircuitOptions.DetailedErrors'

Error: There was an unhandled exception on the current circuit, so this circuit will be terminated. For more details turn on detailed exceptions in 'CircuitOptions.DetailedErrors'

//Startup.cs
public class Startup
{
  private readonly IWebHostEnvironment _env;

  public Startup(IConfiguration configuration, IWebHostEnvironment env)
  {
      Configuration = configuration;
      _env = env;
  }
 
}

//Startup.cs

public void ConfigureServices(IServiceCollection services)
{
  services.AddRazorPages();
   services.AddServerSideBlazor()
                .AddCircuitOptions(options =>
                {
                    

                    if (_env.IsDevelopment()) //only add details when debugging
                    {
                        options.DetailedErrors = true;
                    }
                });
}

[2019-12-14T15:51:13.199Z] Error: System.Net.Http.HttpRequestException: Response status code does not indicate success: 404 (Not Found).
   at System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode()
   at System.Net.Http.HttpClient.GetStringAsyncCore(Task`1 getTask)
   at Microsoft.AspNetCore.Components.HttpClientJsonExtensions.GetJsonAsync[T](HttpClient httpClient, String requestUri)
   at Stockso.BlazorServer.Pages.WebAPI.v1.StockDataPhysicalDiskPanKouAggregateAuctionSearch.OnInitializedAsync() in x\src\BlazorServer\Stockso.BlazorServer\Pages\WebAPI\v1\StockDataPhysicalDiskPanKouAggregateAuctionSearch.razor:line 172
   at Microsoft.AspNetCore.Components.ComponentBase.RunInitAndSetParametersAsync()
   at Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask(Task taskToHandle)

{
  "DetailedErrors": true,
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information",
      "Microsoft.AspNetCore.SignalR": "Debug"
    }
  }
}