1

flutter_app/lib/models/model_manager.dart

@@ -164,7 +164,7 @@ class ModelManager extends ChangeNotifier {
       await _loadActive();
       final res = await _client
           .get(Uri.parse('$baseUrl/api/v1/app/update'))
-          .timeout(const Duration(seconds: 8));
+          .timeout(const Duration(seconds: 30));
       // 服务器 Content-Type 无 charset，http 包默认按 latin1 解码会乱码 → 显式 utf8
       final body =
           jsonDecode(utf8.decode(res.bodyBytes)) as Map<String, dynamic>;
@@ -297,15 +297,18 @@ class ModelManager extends ChangeNotifier {
     final sink = part.openWrite();
     var received = 0;
     try {
+      // 下载无总时长上限（大模型慢网可能数分钟）；连接/响应头与数据流
+      // 分别做 30s 停滞判定，避免断流黑洞永久卡死
       final res = await _client
           .send(http.Request('GET', Uri.parse('$baseUrl${item.downloadUrl}')))
-          .timeout(const Duration(minutes: 3));
+          .timeout(const Duration(seconds: 30));
       if (res.statusCode != 200) {
         await sink.close();
         return false;
       }
       final total = res.contentLength ?? item.sizeBytes;
-      await for (final chunk in res.stream) {
+      await for (final chunk
+          in res.stream.timeout(const Duration(seconds: 30))) {
         if (_cancelRequested.contains(item.datasetId)) break; // 用户取消
         sink.add(chunk);
         received += chunk.length;