diff --git a/lib/core/config/app_config.dart b/lib/core/config/app_config.dart
index a989a8b..00d554c 100644
--- a/lib/core/config/app_config.dart
+++ b/lib/core/config/app_config.dart
@@ -15,18 +15,28 @@ class AppConfig {
   /// `ipconfig getifaddr en0` 重新确认并改这里；
   /// 也可以换成 Bonjour 名字 `http://<LocalHostName>.local:8081`（本机是
   /// `jiangdeMacBook-Air.local`），换网络不用改，但部分办公网会拦组播解析。
-  static const String devHostBaseUrl =
-      'http://jiangdeMacBook-Air.local:8081';
+  static const String devHostBaseUrl = 'http://jiangdeMacBook-Air.local:8081';
 
   static const String _loopbackBaseUrl = 'http://127.0.0.1:8081';
 
   static const String _overrideBaseUrl = String.fromEnvironment('API_BASE_URL');
 
-  static String get apiBaseUrl =>
-      _overrideBaseUrl.isNotEmpty ? _overrideBaseUrl : _defaultBaseUrl;
+  static String _runtimeBaseUrl = '';
 
-  static final String _defaultBaseUrl =
-      _runsOnDevMachine ? _loopbackBaseUrl : devHostBaseUrl;
+  /// Build-time server URL supplied through `--dart-define=API_BASE_URL`.
+  static String get compiledBaseUrl => _overrideBaseUrl;
+
+  /// Existing platform-aware fallback used when no runtime or build override exists.
+  static String get defaultBaseUrl => _defaultBaseUrl;
+
+  /// Effective server URL, including the debug-only runtime override.
+  static String get apiBaseUrl => _runtimeBaseUrl.isNotEmpty
+      ? _runtimeBaseUrl
+      : (compiledBaseUrl.isNotEmpty ? compiledBaseUrl : defaultBaseUrl);
+
+  static final String _defaultBaseUrl = _runsOnDevMachine
+      ? _loopbackBaseUrl
+      : devHostBaseUrl;
 
   /// 模拟器、桌面端与开发机同机，环回地址可用；iOS 真机不满足。
   /// Android 没有等价的探测方式，统一按真机处理（模拟器用
@@ -39,6 +49,16 @@ class AppConfig {
       (defaultTargetPlatform == TargetPlatform.iOS &&
           Platform.environment.containsKey('SIMULATOR_DEVICE_NAME'));
 
+  /// Applies an already normalized runtime URL. Passing null clears it.
+  static void applyRuntimeBaseUrl(String? value) {
+    _runtimeBaseUrl = value ?? '';
+  }
+
+  /// Clears the in-memory runtime override, mainly for tests and restarts.
+  static void clearRuntimeBaseUrl() {
+    _runtimeBaseUrl = '';
+  }
+
   static const Duration requestTimeout = Duration(seconds: 8);
 
   /// 后端返回的是相对路径（/files/...），这里补上服务地址。
diff --git a/lib/core/config/server_endpoint.dart b/lib/core/config/server_endpoint.dart
new file mode 100644
index 0000000..332eb6b
--- /dev/null
+++ b/lib/core/config/server_endpoint.dart
@@ -0,0 +1,86 @@
+// Author: fruit.com.cn
+
+import 'package:flutter/foundation.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+import 'app_config.dart';
+
+/// Debug-only runtime server endpoint persisted outside build-time defines.
+abstract final class ServerEndpoint {
+  /// Preference key used for the runtime server address.
+  static const String preferenceKey = 'dev.api_base_url';
+
+  /// Returns a normalized http(s) URL, or null for invalid input.
+  static String? normalize(String? raw) {
+    final value = raw?.trim() ?? '';
+    final uri = Uri.tryParse(value);
+    if (uri == null ||
+        (uri.scheme != 'http' && uri.scheme != 'https') ||
+        uri.host.isEmpty) {
+      return null;
+    }
+    return value.replaceFirst(RegExp(r'/+$'), '');
+  }
+
+  /// Resolves runtime > dart-define > default using normalized valid values.
+  static String resolve({
+    required String? stored,
+    required String compiled,
+    required String fallback,
+  }) {
+    return normalize(stored) ??
+        normalize(compiled) ??
+        normalize(fallback) ??
+        fallback;
+  }
+
+  /// Loads the persisted override before the app creates its ApiClient.
+  ///
+  /// In release builds this returns immediately without reading preferences.
+  static Future<void> load({
+    bool debug = kDebugMode,
+    SharedPreferencesAsync? preferences,
+  }) async {
+    if (!debug) return;
+    try {
+      final prefs = preferences ?? SharedPreferencesAsync();
+      final stored = await prefs.getString(preferenceKey);
+      AppConfig.applyRuntimeBaseUrl(
+        resolve(
+          stored: stored,
+          compiled: AppConfig.compiledBaseUrl,
+          fallback: AppConfig.defaultBaseUrl,
+        ),
+      );
+    } catch (_) {
+      AppConfig.clearRuntimeBaseUrl();
+    }
+  }
+
+  /// Persists a normalized runtime endpoint.
+  static Future<bool> save(
+    String raw, {
+    SharedPreferencesAsync? preferences,
+  }) async {
+    final normalized = normalize(raw);
+    if (normalized == null) return false;
+    try {
+      await (preferences ?? SharedPreferencesAsync()).setString(
+        preferenceKey,
+        normalized,
+      );
+      return true;
+    } catch (_) {
+      return false;
+    }
+  }
+
+  /// Removes the persisted runtime endpoint.
+  static Future<void> clear({SharedPreferencesAsync? preferences}) async {
+    try {
+      await (preferences ?? SharedPreferencesAsync()).remove(preferenceKey);
+    } catch (_) {
+      // Clearing an optional developer override is best effort.
+    }
+  }
+}
diff --git a/lib/l10n/app_en.arb b/lib/l10n/app_en.arb
index f94a454..18ebcfb 100644
--- a/lib/l10n/app_en.arb
+++ b/lib/l10n/app_en.arb
@@ -262,6 +262,12 @@
   "freeBonus": "Get Free Bonus",
   "watchHistory": "Watch History",
   "settings": "Settings",
+  "serverAddress": "Server address",
+  "serverAddressHint": "http(s)://host:port",
+  "saveAddress": "Save address",
+  "restartToApply": "Restart the app to apply.",
+  "restoreDefault": "Restore default",
+  "invalidServerAddress": "Enter a valid http(s) server address.",
   "signOut": "Sign Out",
   "mockUserName": "Vicky sheng",
   "mockUserId": "ID: M1CZWVYE",
diff --git a/lib/l10n/app_id.arb b/lib/l10n/app_id.arb
index 92ea241..ce7eea5 100644
--- a/lib/l10n/app_id.arb
+++ b/lib/l10n/app_id.arb
@@ -262,6 +262,12 @@
   "freeBonus": "Bonus Gratis",
   "watchHistory": "Riwayat Tontonan",
   "settings": "Pengaturan",
+  "serverAddress": "Alamat server",
+  "serverAddressHint": "http(s)://host:port",
+  "saveAddress": "Simpan alamat",
+  "restartToApply": "Mulai ulang aplikasi untuk menerapkan.",
+  "restoreDefault": "Pulihkan default",
+  "invalidServerAddress": "Masukkan alamat server http(s) yang valid.",
   "signOut": "Keluar",
   "mockUserName": "Vicky sheng",
   "mockUserId": "ID: M1CZWVYE",
diff --git a/lib/l10n/app_localizations.dart b/lib/l10n/app_localizations.dart
index 4c04af7..aeed5a1 100644
--- a/lib/l10n/app_localizations.dart
+++ b/lib/l10n/app_localizations.dart
@@ -1228,6 +1228,42 @@ abstract class AppLocalizations {
   /// **'Settings'**
   String get settings;
 
+  /// No description provided for @serverAddress.
+  ///
+  /// In en, this message translates to:
+  /// **'Server address'**
+  String get serverAddress;
+
+  /// No description provided for @serverAddressHint.
+  ///
+  /// In en, this message translates to:
+  /// **'http(s)://host:port'**
+  String get serverAddressHint;
+
+  /// No description provided for @saveAddress.
+  ///
+  /// In en, this message translates to:
+  /// **'Save address'**
+  String get saveAddress;
+
+  /// No description provided for @restartToApply.
+  ///
+  /// In en, this message translates to:
+  /// **'Restart the app to apply.'**
+  String get restartToApply;
+
+  /// No description provided for @restoreDefault.
+  ///
+  /// In en, this message translates to:
+  /// **'Restore default'**
+  String get restoreDefault;
+
+  /// No description provided for @invalidServerAddress.
+  ///
+  /// In en, this message translates to:
+  /// **'Enter a valid http(s) server address.'**
+  String get invalidServerAddress;
+
   /// No description provided for @signOut.
   ///
   /// In en, this message translates to:
diff --git a/lib/l10n/app_localizations_en.dart b/lib/l10n/app_localizations_en.dart
index 39f794a..40e3466 100644
--- a/lib/l10n/app_localizations_en.dart
+++ b/lib/l10n/app_localizations_en.dart
@@ -601,6 +601,24 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get settings => 'Settings';
 
+  @override
+  String get serverAddress => 'Server address';
+
+  @override
+  String get serverAddressHint => 'http(s)://host:port';
+
+  @override
+  String get saveAddress => 'Save address';
+
+  @override
+  String get restartToApply => 'Restart the app to apply.';
+
+  @override
+  String get restoreDefault => 'Restore default';
+
+  @override
+  String get invalidServerAddress => 'Enter a valid http(s) server address.';
+
   @override
   String get signOut => 'Sign Out';
 
diff --git a/lib/l10n/app_localizations_id.dart b/lib/l10n/app_localizations_id.dart
index fa6c474..9063d41 100644
--- a/lib/l10n/app_localizations_id.dart
+++ b/lib/l10n/app_localizations_id.dart
@@ -603,6 +603,25 @@ class AppLocalizationsId extends AppLocalizations {
   @override
   String get settings => 'Pengaturan';
 
+  @override
+  String get serverAddress => 'Alamat server';
+
+  @override
+  String get serverAddressHint => 'http(s)://host:port';
+
+  @override
+  String get saveAddress => 'Simpan alamat';
+
+  @override
+  String get restartToApply => 'Mulai ulang aplikasi untuk menerapkan.';
+
+  @override
+  String get restoreDefault => 'Pulihkan default';
+
+  @override
+  String get invalidServerAddress =>
+      'Masukkan alamat server http(s) yang valid.';
+
   @override
   String get signOut => 'Keluar';
 
diff --git a/lib/l10n/app_localizations_zh.dart b/lib/l10n/app_localizations_zh.dart
index 23a1192..8bd6d57 100644
--- a/lib/l10n/app_localizations_zh.dart
+++ b/lib/l10n/app_localizations_zh.dart
@@ -592,6 +592,24 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get settings => '设置';
 
+  @override
+  String get serverAddress => '服务器地址';
+
+  @override
+  String get serverAddressHint => 'http(s)://主机:端口';
+
+  @override
+  String get saveAddress => '保存地址';
+
+  @override
+  String get restartToApply => '重启 App 生效';
+
+  @override
+  String get restoreDefault => '恢复默认';
+
+  @override
+  String get invalidServerAddress => '请输入有效的 http(s) 服务器地址。';
+
   @override
   String get signOut => '退出登录';
 
diff --git a/lib/l10n/app_zh.arb b/lib/l10n/app_zh.arb
index c3d1daa..625b639 100644
--- a/lib/l10n/app_zh.arb
+++ b/lib/l10n/app_zh.arb
@@ -224,6 +224,12 @@
   "freeBonus": "领免费奖励",
   "watchHistory": "观看历史",
   "settings": "设置",
+  "serverAddress": "服务器地址",
+  "serverAddressHint": "http(s)://主机:端口",
+  "saveAddress": "保存地址",
+  "restartToApply": "重启 App 生效",
+  "restoreDefault": "恢复默认",
+  "invalidServerAddress": "请输入有效的 http(s) 服务器地址。",
   "signOut": "退出登录",
   "mockUserName": "Vicky sheng",
   "mockUserId": "ID: M1CZWVYE",
diff --git a/lib/main.dart b/lib/main.dart
index 23b1398..16769d8 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -2,10 +2,13 @@
 
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
+
 import 'app.dart';
+import 'core/config/server_endpoint.dart';
 
 Future<void> main() async {
   WidgetsFlutterBinding.ensureInitialized();
   await SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]);
+  await ServerEndpoint.load();
   runApp(const LumaDramaApp());
 }
diff --git a/lib/pages/mine/mine_logic.dart b/lib/pages/mine/mine_logic.dart
index be6faf8..b2e2f9d 100644
--- a/lib/pages/mine/mine_logic.dart
+++ b/lib/pages/mine/mine_logic.dart
@@ -1,12 +1,16 @@
 // Author: fruit.com.cn
 
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
+import '../../core/config/app_config.dart';
 import '../../core/config/locale_controller.dart';
+import '../../core/config/server_endpoint.dart';
 import '../../core/data/models/drama.dart';
 import '../../core/data/models/watch_progress.dart';
 import '../../core/data/repositories/watch_history_repository.dart';
+import '../../core/theme/app_colors.dart';
 import '../../l10n/app_localizations.dart';
 
 enum MyPageAction { home, discover, resume }
@@ -110,39 +114,178 @@ class MineLogic extends ChangeNotifier {
     }
   }
 
-  Future<void> showLanguage(BuildContext context) async {
+  Future<void> showLanguage(
+    BuildContext context, {
+    bool showServerSetting = kDebugMode,
+  }) async {
     final l10n = AppLocalizations.of(context)!;
     await showModalBottomSheet<void>(
       context: context,
       backgroundColor: const Color(0xFF1C1D22),
       showDragHandle: true,
+      isScrollControlled: true,
       builder: (sheetContext) => SafeArea(
-        child: Column(
-          mainAxisSize: MainAxisSize.min,
-          children: [
-            ListTile(title: Text(l10n.language)),
-            for (final (code, label) in [
-              ('en', l10n.english),
-              ('zh', l10n.simplifiedChinese),
-              ('id', l10n.bahasaIndonesia),
-            ])
-              ListTile(
-                title: Text(label),
-                onTap: () {
-                  context.read<LocaleController>().select(code);
-                  Navigator.pop(sheetContext);
-                },
-              ),
-            const SizedBox(height: 8),
-          ],
+        child: ConstrainedBox(
+          constraints: BoxConstraints(
+            maxHeight: MediaQuery.sizeOf(sheetContext).height * 0.85,
+          ),
+          child: SingleChildScrollView(
+            child: Column(
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                ListTile(title: Text(l10n.language)),
+                for (final (code, label) in [
+                  ('en', l10n.english),
+                  ('zh', l10n.simplifiedChinese),
+                  ('id', l10n.bahasaIndonesia),
+                ])
+                  ListTile(
+                    title: Text(label),
+                    onTap: () {
+                      context.read<LocaleController>().select(code);
+                      Navigator.pop(sheetContext);
+                    },
+                  ),
+                if (showServerSetting) ...[
+                  const Divider(height: 1),
+                  ListTile(
+                    key: const Key('server-endpoint-setting'),
+                    leading: const Icon(Icons.dns_outlined),
+                    title: Text(l10n.serverAddress),
+                    subtitle: Text(AppConfig.apiBaseUrl),
+                    trailing: const Icon(Icons.edit_outlined),
+                    onTap: () => _editServerEndpoint(context, l10n),
+                  ),
+                ],
+                const SizedBox(height: 8),
+              ],
+            ),
+          ),
         ),
       ),
     );
   }
 
+  Future<void> _editServerEndpoint(
+    BuildContext context,
+    AppLocalizations l10n,
+  ) async {
+    final changed = await showDialog<bool>(
+      context: context,
+      builder: (_) => _ServerEndpointDialog(l10n: l10n),
+    );
+    if (changed == true && context.mounted) {
+      ScaffoldMessenger.of(
+        context,
+      ).showSnackBar(SnackBar(content: Text(l10n.restartToApply)));
+    }
+  }
+
   @override
   void dispose() {
     _disposed = true;
     super.dispose();
   }
 }
+
+class _ServerEndpointDialog extends StatefulWidget {
+  const _ServerEndpointDialog({required this.l10n});
+
+  final AppLocalizations l10n;
+
+  @override
+  State<_ServerEndpointDialog> createState() => _ServerEndpointDialogState();
+}
+
+class _ServerEndpointDialogState extends State<_ServerEndpointDialog> {
+  late final TextEditingController _controller = TextEditingController(
+    text: AppConfig.apiBaseUrl,
+  );
+  String? _error;
+  bool _saving = false;
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  Future<void> _save() async {
+    final normalized = ServerEndpoint.normalize(_controller.text);
+    if (normalized == null) {
+      setState(() => _error = widget.l10n.invalidServerAddress);
+      return;
+    }
+    setState(() {
+      _saving = true;
+      _error = null;
+    });
+    final saved = await ServerEndpoint.save(normalized);
+    if (!mounted) return;
+    if (!saved) {
+      setState(() {
+        _saving = false;
+        _error = widget.l10n.invalidServerAddress;
+      });
+      return;
+    }
+    Navigator.pop(context, true);
+  }
+
+  Future<void> _restoreDefault() async {
+    setState(() => _saving = true);
+    await ServerEndpoint.clear();
+    if (mounted) Navigator.pop(context, true);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = widget.l10n;
+    return AlertDialog(
+      title: Text(l10n.serverAddress),
+      content: SingleChildScrollView(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            TextField(
+              key: const Key('server-endpoint-input'),
+              controller: _controller,
+              enabled: !_saving,
+              keyboardType: TextInputType.url,
+              autocorrect: false,
+              decoration: InputDecoration(
+                hintText: l10n.serverAddressHint,
+                errorText: _error,
+                errorMaxLines: 2,
+              ),
+            ),
+            const SizedBox(height: 10),
+            Text(
+              l10n.restartToApply,
+              key: const Key('server-endpoint-restart-hint'),
+              style: const TextStyle(color: AppColors.muted, fontSize: 12),
+            ),
+            const SizedBox(height: 4),
+            TextButton(
+              key: const Key('server-endpoint-restore'),
+              onPressed: _saving ? null : _restoreDefault,
+              child: Text(l10n.restoreDefault),
+            ),
+          ],
+        ),
+      ),
+      actions: [
+        TextButton(
+          onPressed: _saving ? null : () => Navigator.pop(context, false),
+          child: Text(l10n.cancel),
+        ),
+        FilledButton(
+          key: const Key('server-endpoint-save'),
+          onPressed: _saving ? null : _save,
+          child: Text(l10n.saveAddress),
+        ),
+      ],
+    );
+  }
+}
diff --git a/lib/pages/mine/mine_view.dart b/lib/pages/mine/mine_view.dart
index d0fe868..9ed63bd 100644
--- a/lib/pages/mine/mine_view.dart
+++ b/lib/pages/mine/mine_view.dart
@@ -2,6 +2,7 @@
 
 import 'dart:async';
 
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
@@ -41,6 +42,7 @@ class MyPage extends StatefulWidget {
     this.onSignOut,
     this.dramas,
     this.onDramaSelected,
+    this.debugShowSetting = kDebugMode,
   });
 
   final Drama drama;
@@ -57,6 +59,7 @@ class MyPage extends StatefulWidget {
   final VoidCallback? onSignOut;
   final List<Drama>? dramas;
   final ValueChanged<Drama>? onDramaSelected;
+  final bool debugShowSetting;
 
   @override
   State<MyPage> createState() => _MyPageState();
@@ -214,7 +217,10 @@ class _MyPageState extends State<MyPage> {
       leading: const Icon(Icons.language_rounded, color: AppColors.blueSoft),
       title: Text(l10n.appLanguage),
       trailing: const Icon(Icons.chevron_right_rounded),
-      onTap: () => logic.showLanguage(context),
+      onTap: () => logic.showLanguage(
+        context,
+        showServerSetting: widget.debugShowSetting,
+      ),
     ),
   ];
 
@@ -471,7 +477,10 @@ class _MyPageState extends State<MyPage> {
             ),
             title: Text(l10n.settings),
             trailing: const Icon(Icons.chevron_right_rounded),
-            onTap: () => logic.showLanguage(context),
+            onTap: () => logic.showLanguage(
+              context,
+              showServerSetting: widget.debugShowSetting,
+            ),
           ),
         ],
       ),
diff --git a/test/config/server_endpoint_test.dart b/test/config/server_endpoint_test.dart
new file mode 100644
index 0000000..974b42b
--- /dev/null
+++ b/test/config/server_endpoint_test.dart
@@ -0,0 +1,92 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'package:shared_preferences_platform_interface/in_memory_shared_preferences_async.dart';
+import 'package:shared_preferences_platform_interface/shared_preferences_async_platform_interface.dart';
+
+import 'package:fruitshorts/core/config/app_config.dart';
+import 'package:fruitshorts/core/config/server_endpoint.dart';
+
+void main() {
+  setUp(() {
+    SharedPreferencesAsyncPlatform.instance =
+        InMemorySharedPreferencesAsync.empty();
+    AppConfig.clearRuntimeBaseUrl();
+  });
+
+  tearDown(AppConfig.clearRuntimeBaseUrl);
+
+  test('should_normalize_http_urls_and_reject_invalid_values', () {
+    expect(
+      ServerEndpoint.normalize('  https://192.168.1.9:8081///  '),
+      'https://192.168.1.9:8081',
+    );
+    expect(
+      ServerEndpoint.normalize('http://example.test:8081/path/'),
+      'http://example.test:8081/path',
+    );
+    expect(ServerEndpoint.normalize('ftp://example.test'), isNull);
+    expect(ServerEndpoint.normalize('example.test:8081'), isNull);
+    expect(ServerEndpoint.normalize('http://'), isNull);
+  });
+
+  test('should_prioritize_runtime_over_dart_define_over_default', () {
+    expect(
+      ServerEndpoint.resolve(
+        stored: ' http://runtime.test:8081/ ',
+        compiled: 'http://define.test:8081',
+        fallback: 'http://default.test:8081',
+      ),
+      'http://runtime.test:8081',
+    );
+    expect(
+      ServerEndpoint.resolve(
+        stored: 'ftp://invalid',
+        compiled: 'http://define.test:8081/',
+        fallback: 'http://default.test:8081',
+      ),
+      'http://define.test:8081',
+    );
+    expect(
+      ServerEndpoint.resolve(
+        stored: null,
+        compiled: '',
+        fallback: 'http://default.test:8081/',
+      ),
+      'http://default.test:8081',
+    );
+  });
+
+  test('should_apply_stored_url_only_when_debug_is_enabled', () async {
+    SharedPreferencesAsyncPlatform.instance =
+        InMemorySharedPreferencesAsync.withData({
+          ServerEndpoint.preferenceKey: ' http://192.168.31.187:8081/ ',
+        });
+    final original = AppConfig.apiBaseUrl;
+
+    await ServerEndpoint.load(debug: false);
+    expect(AppConfig.apiBaseUrl, original);
+
+    await ServerEndpoint.load(debug: true);
+    expect(AppConfig.apiBaseUrl, 'http://192.168.31.187:8081');
+  });
+
+  test('should_save_normalized_url_and_clear_override', () async {
+    expect(await ServerEndpoint.save('ftp://invalid'), isFalse);
+    expect(
+      await SharedPreferencesAsync().getString(ServerEndpoint.preferenceKey),
+      isNull,
+    );
+
+    expect(await ServerEndpoint.save(' http://192.168.31.187:8081/ '), isTrue);
+    expect(
+      await SharedPreferencesAsync().getString(ServerEndpoint.preferenceKey),
+      'http://192.168.31.187:8081',
+    );
+
+    await ServerEndpoint.clear();
+    expect(
+      await SharedPreferencesAsync().getString(ServerEndpoint.preferenceKey),
+      isNull,
+    );
+  });
+}
diff --git a/test/mine/server_endpoint_setting_test.dart b/test/mine/server_endpoint_setting_test.dart
new file mode 100644
index 0000000..7eb9c49
--- /dev/null
+++ b/test/mine/server_endpoint_setting_test.dart
@@ -0,0 +1,101 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:provider/provider.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'package:shared_preferences_platform_interface/in_memory_shared_preferences_async.dart';
+import 'package:shared_preferences_platform_interface/shared_preferences_async_platform_interface.dart';
+
+import 'package:fruitshorts/core/config/locale_controller.dart';
+import 'package:fruitshorts/core/config/server_endpoint.dart';
+import 'package:fruitshorts/core/data/models/drama.dart';
+import 'package:fruitshorts/core/data/repositories/watch_history_repository.dart';
+import 'package:fruitshorts/l10n/app_localizations.dart';
+import 'package:fruitshorts/pages/mine/mine_logic.dart';
+
+const _drama = Drama(
+  id: 'drama-1',
+  title: 'The Signal',
+  synopsis: 'synopsis',
+  posterUrl: '/files/1.jpg',
+);
+
+void main() {
+  setUp(() {
+    SharedPreferencesAsyncPlatform.instance =
+        InMemorySharedPreferencesAsync.empty();
+  });
+
+  testWidgets('should_show_server_address_when_debug_entry_is_enabled', (
+    tester,
+  ) async {
+    await _pumpSettings(tester, showServerSetting: true);
+    expect(find.byKey(const Key('server-endpoint-setting')), findsOneWidget);
+    expect(find.text('Server address'), findsOneWidget);
+  });
+
+  testWidgets('should_hide_server_address_when_debug_entry_is_disabled', (
+    tester,
+  ) async {
+    await _pumpSettings(tester, showServerSetting: false);
+    expect(find.byKey(const Key('server-endpoint-setting')), findsNothing);
+    expect(find.text('Server address'), findsNothing);
+  });
+
+  testWidgets('should_reject_invalid_server_address_without_saving', (
+    tester,
+  ) async {
+    await _pumpSettings(tester, showServerSetting: true);
+    await tester.tap(find.byKey(const Key('server-endpoint-setting')));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Restart the app to apply.'), findsOneWidget);
+    await tester.enterText(
+      find.byKey(const Key('server-endpoint-input')),
+      'ftp://invalid',
+    );
+    await tester.tap(find.byKey(const Key('server-endpoint-save')));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Enter a valid http(s) server address.'), findsOneWidget);
+    expect(
+      await SharedPreferencesAsync().getString(ServerEndpoint.preferenceKey),
+      isNull,
+    );
+  });
+}
+
+Future<void> _pumpSettings(
+  WidgetTester tester, {
+  required bool showServerSetting,
+}) async {
+  final logic = MineLogic(
+    history: InMemoryWatchHistoryRepository(),
+    drama: _drama,
+    initialSection: 0,
+  );
+  addTearDown(logic.dispose);
+  await tester.pumpWidget(
+    ChangeNotifierProvider(
+      create: (_) => LocaleController(),
+      child: MaterialApp(
+        locale: const Locale('en'),
+        localizationsDelegates: AppLocalizations.localizationsDelegates,
+        supportedLocales: AppLocalizations.supportedLocales,
+        home: Builder(
+          builder: (context) => Scaffold(
+            body: TextButton(
+              key: const Key('open-settings'),
+              onPressed: () => logic.showLanguage(
+                context,
+                showServerSetting: showServerSetting,
+              ),
+              child: const Text('Open settings'),
+            ),
+          ),
+        ),
+      ),
+    ),
+  );
+  await tester.tap(find.byKey(const Key('open-settings')));
+  await tester.pumpAndSettle();
+}