Short Walks - 406 Error While Creating a .Net Core Api

I’m afraid this is another of those: “What has AddMvc()” ever done for us posts.  Today, I was creating a brand new .Net Core 2.1 Api and, instead of calling AddMvc in ConfigureServices, I instead used AddMvcCore:

public void ConfigureServices(IServiceCollection services)
{
    services.AddMvcCore();

When I tried to access the API, I got a 406 error.  The fix is very simple (and one that using AddMvc() does for you:

public void ConfigureServices(IServiceCollection services)
{
    services.AddMvcCore()
            .AddJsonFormatters();