Minimum configuration web api in AspNetCore

Program.cs

public static class Program
{
    public static void Main(string[] args) => new WebHostBuilder()
        .UseKestrel()
        .UseUrls("http://localhost:5000")
        .ConfigureServices(services => services.AddRouting())
        .Configure(app =>
            app.UseRouter(router =>
                router.MapGet("hello",
                    async handler => await handler.Response.WriteAsync("Hello World!"))))
        .Build()
        .Run();
}