Network Cache Interceptor

Network Cache Interceptor is a custom Dio interceptor for caching network requests. It delivers cached data when offline and improves network request handling.

📦 Installation

Add the following to your pubspec.yaml:

dependencies:
  network_cache_interceptor: ^2.3.5

Or install it via flutter pub add:

flutter pub add network_cache_interceptor

🚀 What’s New in Version 2.3.5

Version 2.3.5 brings improved caching behavior and greater developer control:

✅ New Features:

• No-Cache HTTP Methods Option:
  You can now specify which HTTP methods should not be cached (e.g., POST, PUT). This is similar to noCacheStatusCodes and gives developers finer control.

✅ Enhanced Offline Mode:

• Now uses DioExceptionType.connectionError to better detect offline situations and return cached data when appropriate.

✅ Improved Robustness:

• Improved handling of unique_key and headers when generating cache keys.

🚀 Usage

1. Configure Dio

import 'package:dio/dio.dart';
import 'package:network_cache_interceptor/network_cache_interceptor.dart';

void main() {
  final dio = Dio();

  dio.interceptors.add(
    NetworkCacheInterceptor(
      noCacheStatusCodes: [401, 403, 304],
      noCacheHttpMethods: ['POST', 'PUT'], // Specify which HTTP methods should NOT be cached
      cacheValidityMinutes: 30,
      getCachedDataWhenError: true,
      uniqueWithHeader: true,
    ),
  );
}

2. Make a Request

By default, GET requests are cached, unless explicitly disabled:

final response = await dio.get(
  'https://jsonplaceholder.typicode.com/posts',
  options: Options(
    extra: {
      'cache': true,         // Explicitly enable caching
      'validate_time': 60,   // Cache validity in minutes
    },
  ),
);

To disable caching for a request:

final response = await dio.get(
  'https://jsonplaceholder.typicode.com/posts',
  options: Options(
    extra: {'cache': false}, // Disable caching for this request
  ),
);

3. Use unique_key for More Precise Caching

unique_key ensures different cache entries for similar requests:

final response = await dio.get(
  'https://jsonplaceholder.typicode.com/posts',
  options: Options(
    extra: {
      'cache': true,
      'unique_key': 'user_123', // Cache entry specific to this key
    },
  ),
);

4. Clear All Cached Data

To remove all cached data:

final cacheInterceptor = NetworkCacheInterceptor();
await cacheInterceptor.clearDatabase();

⚙️ Configuration

🔧 Technical Details

• Offline Mode: Cached responses are returned on timeouts, no connection, or socket errors.
• Custom No-Cache HTTP Methods: Control which request methods should bypass caching.
• Header Filtering: Ignores Authorization and User-Agent headers in cache keys for consistency.
• Granular Caching: Supports unique_key and optional header-based differentiation.
• Robust Database Handling: Uses a local SQL database for efficient storage.

🎯 Example

final dio = Dio();
dio.interceptors.add(NetworkCacheInterceptor());

try {
  final response = await dio.get(
    'https://jsonplaceholder.typicode.com/posts',
    options: Options(
      extra: {'cache': true, 'unique_key': 'session_abc'},
    ),
  );
  print(response.data);
} catch (e) {
  print('Error: $e');
}

🛡️ License

This project is licensed under the MIT License.

💬 Additional Information

For more information or to contribute, visit our GitHub page.

Stay tuned for more features and enhancements! 🎉

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Thanks for using Network Cache Interceptor! 🚀