How to change the default folder of an ASP . NET Core application?

Question

I am trying to set up an ASP site . NET Core, to host an Angularjs application.

The structure my "index" page is using is:

/wwwroot/app/index.html

I tried some settings in the Startup.Cs file, like this one:

    app.UseStaticFiles(new StaticFileOptions()
            {
                FileProvider = new PhysicalFileProvider(
                    Path.Combine(Directory.GetCurrentDirectory(), @"wwwroot", "app"))
            });

And I also tried the following configuration in the Main method:

    var host = new WebHostBuilder()
        .UseKestrel()
        .UseContentRoot(Path.Combine(Directory.GetCurrentDirectory(), @"wwwroot", "app"))
        .UseIISIntegration()
        .UseStartup<Startup>()
        .Build();

Even with both settings above, I still need to browse the URL http://localhost:PORT/app to render the Index.html file.

I want the Index.html file to be rendered when I navigate to the root URL http://localhost:PORT/

EDIT:

I just found the solution. It is necessary to add this in the Webhostbuilder call:

    .UseWebRoot(Path.Combine(Directory.GetCurrentDirectory(), @"wwwroot", "app"))