Networking
What is the difference between the http package and Dio in Flutter?
The http package is a simple, low-level HTTP client. Dio is a feature-rich client with interceptors, automa...
20 XP3m
Networking
15 questions
http, dio, serialization, offline-first, WebSocket
Networking
How do you serialize and deserialize JSON in Flutter?
Manual: implement fromJson/toJson by hand. json_serializable: code-generates toJson/fromJson via annotation...
20 XP4m
Networking
How do you handle network errors properly in Flutter?
Wrap API calls in try/catch, handle DioException types specifically (timeout, cancel, response), and return...
30 XP4m
Networking
How do you check and monitor internet connectivity in Flutter?
Use the connectivity_plus package to listen to ConnectivityResult changes (wifi, mobile, none). Note: a Con...
20 XP3m
Networking
What is Retrofit for Flutter and how does it work?
Retrofit (retrofit.dart) uses annotations and build_runner to generate type-safe Dio-based API clients from...
30 XP3m
Networking
How do you implement WebSocket communication in Flutter?
Use the web_socket_channel package to connect to a WebSocket server. It returns a WebSocketChannel with a s...
30 XP4m
Networking
What is certificate pinning and how do you implement it in Flutter?
Certificate pinning rejects connections to servers whose SSL certificate doesn't match an expected fingerpr...
50 XP4m
Networking
How do you implement automatic retry logic with Dio interceptors?
Add a custom Dio interceptor that catches network errors and retries the request up to N times with exponen...
30 XP3m
Networking
How do you use GraphQL in a Flutter app?
Use the graphql_flutter or ferry package. graphql_flutter provides Query/Mutation/Subscription widgets. Fer...
30 XP4m
Networking
How do you upload files with progress tracking in Flutter?
Use Dio's FormData with MultipartFile for multipart uploads. Pass onSendProgress callback to track upload p...
30 XP3m
Networking
What are the different pagination strategies for REST APIs in Flutter?
Offset pagination: GET /items?page=2&limit=20. Cursor pagination: GET /items?after=cursor&limit=20. Keyset:...
30 XP3m
Networking
How do you decode large JSON payloads without blocking the UI?
Use compute(jsonDecode, rawString) to run JSON decoding in a background Isolate. compute() is a convenience...
30 XP3m
Networking
How do you cache API responses locally in Flutter?
Cache API responses in Hive (NoSQL, fast) or Drift (SQLite, relational). Store the data with a TTL timestam...
30 XP3m
Networking
How do you handle API versioning in a Flutter app?
Include the API version in the base URL (https://api.example.com/v2) or as an Accept header (Accept: applic...
20 XP2m
Networking
How do you mock API calls in Flutter tests?
For Dio: use DioMixin + MockAdapter or inject a mock repository with mocktail. For http package: inject a m...
30 XP3m