1

flutter_app/lib/update/update_checker.dart

@@ -38,7 +38,7 @@ class UpdateChecker {
     try {
       final res = await _client
           .get(Uri.parse('$baseUrl/api/v1/app/update'))
-          .timeout(const Duration(seconds: 8));
+          .timeout(const Duration(seconds: 30));
       // 服务器 Content-Type 无 charset，http 包默认按 latin1 解码会乱码 → 显式 utf8
       final body =
           jsonDecode(utf8.decode(res.bodyBytes)) as Map<String, dynamic>;

flutter_app/lib/update/update_screen.dart

@@ -98,14 +98,19 @@ class _UpdateScreenState extends State<UpdateScreen> {
     });
     try {
       if (_apkPart.existsSync()) _apkPart.deleteSync();
-      final res = await _client.send(http.Request('GET', Uri.parse(widget.url)));
+      // 下载无总时长上限（APK 几十 MB 慢网可能数分钟）；连接/响应头与
+      // 数据流分别做 30s 停滞判定，避免断流黑洞永久卡死
+      final res = await _client
+          .send(http.Request('GET', Uri.parse(widget.url)))
+          .timeout(const Duration(seconds: 30));
       if (res.statusCode != 200) {
         throw HttpException('HTTP ${res.statusCode}');
       }
       final total = res.contentLength ?? -1;
       final sink = _apkPart.openWrite();
       var received = 0;
-      await for (final chunk in res.stream) {
+      await for (final chunk
+          in res.stream.timeout(const Duration(seconds: 30))) {
         sink.add(chunk);
         received += chunk.length;
         if (mounted && total > 0) {