ASP.NET Core futures

IMiddleware.cs

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddTransient<HelloWorldMiddleware>();
    }

    public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
    {
        app.UseMiddleware<HelloWorldMiddleware>();
    }
}

public class HelloWorldMiddleware : IMiddleware
{
    public Task Invoke(HttpContext context, RequestDelegate next)
    {
        return context.Response.WriteAsync("Hello World");
    }
}