feat(app): add AppHeaderInterceptor

to provide these via AppCubit
- Accept-Language: The current locale of the app
- User-Agent: The package name and version of the app

packages/djangoflow_app/lib/djangoflow_app.dart

@@ -8,3 +8,4 @@ export 'src/presentation/consumers/app_cubit_consumer.dart';
 export 'src/presentation/listeners/app_cubit_listener.dart';
 export 'src/utils/djangoflow_app_runner.dart';
 export 'src/utils/djangoflow_app_snackbar.dart';
+export 'src/data/interceptors/app_header_interceptor.dart';

packages/djangoflow_app/lib/src/data/interceptors/app_header_interceptor.dart

@@ -0,0 +1,21 @@
+import 'package:dio/dio.dart';
+import 'package:djangoflow_app/src/bloc/app_cubit.dart';
+import 'package:flutter/foundation.dart';
+
+/// AppHeaderInterceptor is a dio [Interceptor] which adds the following headers to every request via [AppCubit] :
+/// - Accept-Language: The current locale of the app
+/// - User-Agent: The package name and version of the app
+class AppHeaderInterceptor extends Interceptor {
+  @override
+  void onRequest(RequestOptions options, RequestInterceptorHandler handler) {
+    if (AppCubit.instance.state.locale.isNotEmpty) {
+      options.headers['Accept-Language'] = AppCubit.instance.state.locale;
+    }
+
+    if (!kIsWeb) {
+      options.headers['User-Agent'] =
+          '${AppCubit.packageInfo?.packageName}/${AppCubit.packageInfo?.version}';
+    }
+    super.onRequest(options, handler);
+  }
+}

packages/djangoflow_app/pubspec.yaml

@@ -8,11 +8,11 @@ environment:
   flutter: ">=1.17.0"
 
 dependencies:
+  dio: ^5.3.2
   flutter:
     sdk: flutter
   flutter_localizations:
     sdk: flutter
-
   flutter_bloc: ^8.1.3
   freezed_annotation: ^2.2.0
   json_annotation: ^4.8.1