title: Visual Studio 2017 Angular 6 shows "Cannot Get /" First Try Only
body: <p>I am using Visual Studio 2017 15.8.3 with .Net Core 2.1 and Angular 6. I used the template to create the project and upgraded it from Angular 5 to 6. It ran as expected. I removed the template code and added my own. As I added more code I started getting the Cannot GET/ message; however, if I go into any .ts file and save it, refresh the browser everything reloads and comes up as expected. No errors  ever show. I can't see any issues.</p>
  
  <p>I have this in Startup</p>
  
  <pre><code>    app.UseSpa(spa =&gt;
      {
          // To learn more about options for serving an Angular SPA from ASP.NET Core,
          // see https://go.microsoft.com/fwlink/?linkid=864501
  
          spa.Options.SourcePath = "ClientApp";
  
          if (env.IsDevelopment())
          {
              spa.Options.StartupTimeout = new TimeSpan(0, 0, 360);
              spa.UseAngularCliServer(npmScript: "start");
              spa.UseProxyToSpaDevelopmentServer("https://localhost:4200");
          }
      });
  </code></pre>
  
  <p>I'm stumped.</p>
  
  <p>Thanks, 
  Paul</p>