Steps to migrate the original ASP.NET MVC project to ASP.NET Core:

1. Install VS2015 + .NET Core SDK + VS2015 Tooling (Preview 2 at the time); fix common installer issues (0x80072f8a) per linked guide.

2. Create a new empty ASP.NET Core app; add NuGet packages (AngleSharp, Newtonsoft.Json, etc.).

3. Copy Controllers/Views; in Core, static files live under wwwroot, so move assets accordingly.

4. Configure Startup:

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public void ConfigureServices(IServiceCollection services) => services.AddMvc();
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory lf)
{
  lf.AddConsole(); if (env.IsDevelopment()) app.UseDeveloperExceptionPage();
  app.UseStaticFiles();
  app.UseMvc(routes => {
    routes.MapRoute(name: "default", template: "{controller=House}/{action=Index}/{id?}");
  });
}

5. Rewrite GetHTMLByURL using WebRequest (Core changed HttpWebRequest usage) and proper encodings.

The rest is adapting namespaces/usings and resolving API differences.