diff --git a/poc/flutter-poc/lib/poc_simulation.dart b/poc/flutter-poc/lib/poc_simulation.dart
index a7badc3..e3a9d48 100644
--- a/poc/flutter-poc/lib/poc_simulation.dart
+++ b/poc/flutter-poc/lib/poc_simulation.dart
@@ -82,9 +82,8 @@ bool isPocSessionDeadStop({
   required List<String> sessionDeadAuthIds,
 }) {
   if (result.status != 'AUTH') return false;
-  final isSessionDead = sessionDeadAuthIds.any(
-    (id) => step is PocSimHostStep && step.auth == id,
-  );
+  final isSessionDead =
+      step is PocSimHostStep && sessionDeadAuthIds.contains(step.auth);
   final detail = result.detail ?? '';
   return isSessionDead &&
       (detail.contains('invalid_grant') ||
@@ -199,10 +198,11 @@ PocSimStep? _parseStep(Map<String, dynamic> m) {
 Future<PocSimStepResult> runPocSimStep(
   MorphClient morph,
   PocSimulationConfig cfg,
-  PocSimStep step,
-) async {
+  PocSimStep step, [
+  http.Client? httpClient,
+]) async {
   return switch (step) {
-    PocSimFetchStep s => _runFetch(s, cfg.mockApiBaseUrl),
+    PocSimFetchStep s => _runFetch(s, cfg.mockApiBaseUrl, httpClient),
     PocSimHostStep s => _runHost(morph, s),
     PocSimLogoutStep s => _runLogout(morph, s),
   };
diff --git a/poc/flutter-poc/lib/widgets/simulation_panel.dart b/poc/flutter-poc/lib/widgets/simulation_panel.dart
index 8efe9d5..448d277 100644
--- a/poc/flutter-poc/lib/widgets/simulation_panel.dart
+++ b/poc/flutter-poc/lib/widgets/simulation_panel.dart
@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:http/http.dart' as http;
 import 'package:morph_core/morph_core.dart';
 
 import '../poc_simulation.dart';
@@ -24,6 +25,13 @@ class _SimulationPanelState extends State<SimulationPanel> {
   bool _probe404Enabled = false;
   final List<PocSimStepResult> _results = [];
   String _sessionDeadMessage = '';
+  final http.Client _httpClient = http.Client();
+
+  @override
+  void dispose() {
+    _httpClient.close();
+    super.dispose();
+  }
 
   List<PocSimStep> get _autoSteps => widget.cfg.steps
       .where((s) =>
@@ -47,7 +55,7 @@ class _SimulationPanelState extends State<SimulationPanel> {
 
     for (final step in _autoSteps) {
       if (!mounted) break;
-      final result = await runPocSimStep(widget.morph, widget.cfg, step);
+      final result = await runPocSimStep(widget.morph, widget.cfg, step, _httpClient);
 
       if (!mounted) break;
       setState(() => _results.add(result));