Checking the "Enable Windows Authentication" checkbox in Debug properties in VS 2015 breaks the HttpCacheService. To replicate, simply check the box, run debug and navigate to the rest-test page. Unchecking the box removes the error, and replacing httpCache with http remvoes the error.

The error from Node is:
Exception: Call to Node module failed with error: Response with status: 401 null for URL:
Microsoft.AspNetCore.NodeServices.HostingModels.HttpNodeInstance+d__7.MoveNext()