Make templates work with nonempty baseUrls (e.g., IIS virtual directories)

templates/AureliaSpa/ClientApp/boot.ts

@@ -1,5 +1,6 @@
 import 'isomorphic-fetch';
 import { Aurelia, PLATFORM } from 'aurelia-framework';
+import { HttpClient } from 'aurelia-fetch-client';
 import 'bootstrap/dist/css/bootstrap.css';
 import 'bootstrap';
 declare const IS_DEV_BUILD: boolean; // The value is supplied by Webpack during the build
@@ -11,5 +12,10 @@ export function configure(aurelia: Aurelia) {
         aurelia.use.developmentLogging();
     }
 
+    new HttpClient().configure(config => {
+        const baseUrl = document.getElementsByTagName('base')[0].href;
+        config.withBaseUrl(baseUrl);
+    });
+
     aurelia.start().then(() => aurelia.setRoot(PLATFORM.moduleName('app/components/app/app')));
 }