added frontend

hartmann-foto-documentation-frontend/lib/utils/http_client_utils.dart

@@ -0,0 +1,20 @@
+import 'package:http/http.dart' as http;
+
+import 'http_client_factory_stub.dart' if (dart.library.io) 'http_client_factory_app.dart' if (dart.library.js) 'http_client_factory_web.dart';
+import 'http_client_interceptor.dart';
+
+abstract class HttpClientUtils {
+  http.Client get client;
+}
+
+class HttpCLientUtilsImpl extends HttpClientUtils {
+  http.Client? _client;
+
+  @override
+  http.Client get client => _getClient();
+
+  http.Client _getClient() {
+    _client ??= HttpClientInterceptor(getHttpClientFactory().createHttpClient());
+    return _client!;
+  }
+}