feat: 测试缓存 test

lib/main.dart

@@ -16,6 +16,8 @@ const _shellBackground = Color(0xFFF8FBFF);
 const _shellAccent = Color(0xFF0089FF);
 const _shellSubText = Color(0xFF8E9AB0);
 const _resumeCoverDuration = Duration(milliseconds: 700);
+const _urlOnlyShellMode = true;
+const _urlOnlyWebViewUrl = 'https://h5-im.imharry.work/';
 const _noCacheHeaders = {
   'Cache-Control': 'no-cache, no-store, max-age=0, must-revalidate',
   'Pragma': 'no-cache',
@@ -263,6 +265,10 @@ Future<void> main() async {
       systemNavigationBarIconBrightness: Brightness.dark,
     ),
   );
+  if (_urlOnlyShellMode) {
+    runApp(const UrlOnlyWebViewApp());
+    return;
+  }
   final shellBranding = await ShellBranding.load();
   runApp(ImWebViewApp(shellBranding: shellBranding));
 }
@@ -300,6 +306,121 @@ class ShellBranding {
   static String _trim(String? value) => value?.trim() ?? '';
 }
 
+class UrlOnlyWebViewApp extends StatelessWidget {
+  const UrlOnlyWebViewApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: _urlOnlyWebViewUrl,
+      debugShowCheckedModeBanner: false,
+      theme: ThemeData(scaffoldBackgroundColor: Colors.white),
+      home: const UrlOnlyWebViewPage(),
+    );
+  }
+}
+
+class UrlOnlyWebViewPage extends StatefulWidget {
+  const UrlOnlyWebViewPage({super.key});
+
+  @override
+  State<UrlOnlyWebViewPage> createState() => _UrlOnlyWebViewPageState();
+}
+
+class _UrlOnlyWebViewPageState extends State<UrlOnlyWebViewPage> {
+  late final WebViewController _controller;
+
+  int _progress = 0;
+  String? _loadError;
+
+  @override
+  void initState() {
+    super.initState();
+    _controller = WebViewController()
+      ..setJavaScriptMode(JavaScriptMode.unrestricted)
+      ..setBackgroundColor(Colors.white)
+      ..setNavigationDelegate(
+        NavigationDelegate(
+          onProgress: (progress) {
+            if (mounted) {
+              setState(() => _progress = progress);
+            }
+          },
+          onPageStarted: (_) {
+            if (mounted) {
+              setState(() {
+                _loadError = null;
+                _progress = 0;
+              });
+            }
+          },
+          onPageFinished: (url) {
+            debugPrint('[UrlOnlyWebView] finished: $url');
+            if (mounted) {
+              setState(() => _progress = 100);
+            }
+          },
+          onWebResourceError: (error) {
+            if (error.isForMainFrame ?? true) {
+              if (mounted) {
+                setState(() => _loadError = error.description);
+              }
+            }
+          },
+          onNavigationRequest: _handleUrlOnlyNavigationRequest,
+        ),
+      )
+      ..loadRequest(Uri.parse(_urlOnlyWebViewUrl));
+  }
+
+  Future<NavigationDecision> _handleUrlOnlyNavigationRequest(
+    NavigationRequest request,
+  ) async {
+    final uri = Uri.tryParse(request.url);
+    if (uri == null) {
+      return NavigationDecision.prevent;
+    }
+
+    const webSchemes = {'http', 'https', 'about', 'data'};
+    if (webSchemes.contains(uri.scheme)) {
+      return NavigationDecision.navigate;
+    }
+
+    try {
+      await launchUrl(uri, mode: LaunchMode.externalApplication);
+    } catch (_) {}
+    return NavigationDecision.prevent;
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      backgroundColor: Colors.white,
+      body: SafeArea(
+        bottom: false,
+        child: Stack(
+          children: [
+            WebViewWidget(controller: _controller),
+            if (_progress < 100)
+              LinearProgressIndicator(
+                value: _progress == 0 ? null : _progress / 100,
+                minHeight: 2,
+              ),
+            if (_loadError != null)
+              _ErrorPanel(
+                message: _loadError!,
+                onRetry: () {
+                  setState(() => _loadError = null);
+                  _controller.loadRequest(Uri.parse(_urlOnlyWebViewUrl));
+                },
+              ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
 class ImWebViewApp extends StatelessWidget {
   const ImWebViewApp({
     super.key,