opening up CORS in a .NET Core MVC project

As suggested here, it is different than what is here. Follow these steps:

1. Install CORS with this NuGet command:
   install-package Microsoft.AspNetCore.Cors
    
2. services.AddCors();
   ...goes in the ConfigureServices method of Startup.cs just before...
   services.AddMvc();
    
3. app.UseCors(builder =>
         builder.AllowAnyOrigin().AllowAnyMethod().AllowAnyHeader());
   ...goes in the Configure method of Startup.cs just before...
   app.UseMvc();

 
 

I have, this weekend, made a dummy Hello World project that shows off Angular 4 and .NET Core 2.0 playing nicely together complete with tests on both sides of the wire and IoC on both sides of the wire. If you'd like to take a look you may see it here. The CORS thing is one of many challenges I fought with to make this happen.