HTTP client configuration, API providers, error handling, and request/response patterns
Implements HTTP client providers with authentication, error handling, and request/response patterns.
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import 'dart:convert';
import 'package:http/http.dart' as http;
class UserProvider {
final http.Client _client;
final String _baseUrl;
UserProvider(this._client, {String? baseUrl})
: _baseUrl = baseUrl ?? 'https://api.example.com';
Map<String, String> get _headers => {
'Content-Type': 'application/json',
'Accept': 'application/json',
};
Future<UserModel> fetchUser(String id) async {
final response = await _client.get(
Uri.parse('$_baseUrl/users/$id'),
headers: _headers,
).timeout(Duration(seconds: 10));
if (response.statusCode == 200) {
return UserModel.fromJson(json.decode(response.body));
} else if (response.statusCode == 404) {
throw ServerException(message: 'User not found');
} else {
throw ServerException(
message: 'Failed to fetch user',
statusCode: response.statusCode,
);
}
}
Future<List<UserModel>> fetchAllUsers() async {
final response = await _client.get(
Uri.parse('$_baseUrl/users'),
headers: _headers,
).timeout(Duration(seconds: 10));
if (response.statusCode == 200) {
final List<dynamic> data = json.decode(response.body);
return data.map((json) => UserModel.fromJson(json)).toList();
} else {
throw ServerException(message: 'Failed to fetch users');
}
}
Future<UserModel> createUser(Map<String, dynamic> data) async {
final response = await _client.post(
Uri.parse('$_baseUrl/users'),
headers: _headers,
body: json.encode(data),
).timeout(Duration(seconds: 10));
if (response.statusCode == 201) {
return UserModel.fromJson(json.decode(response.body));
} else {
throw ServerException(message: 'Failed to create user');
}
}
Future<void> deleteUser(String id) async {
final response = await _client.delete(
Uri.parse('$_baseUrl/users/$id'),
headers: _headers,
).timeout(Duration(seconds: 10));
if (response.statusCode != 204) {
throw ServerException(message: 'Failed to delete user');
}
}
}
class AuthenticatedClient extends http.BaseClient {
final http.Client _inner;
final String Function() _getToken;
AuthenticatedClient(this._inner, this._getToken);
@override
Future<http.StreamedResponse> send(http.BaseRequest request) async {
final token = _getToken();
if (token.isNotEmpty) {
request.headers['Authorization'] = 'Bearer $token';
}
request.headers['Content-Type'] = 'application/json';
request.headers['Accept'] = 'application/json';
return _inner.send(request);
}
}
// Usage in bindings
Get.lazyPut<http.Client>(
() => AuthenticatedClient(
http.Client(),
() => Get.find<StorageService>().token ?? '',
),
);
try {
final response = await _client.get(url);
return parseResponse(response);
} on SocketException {
throw NetworkException();
} on TimeoutException {
throw ServerException(message: 'Request timeout');
} on FormatException {
throw ServerException(message: 'Invalid response format');
} catch (e) {
throw ServerException(message: e.toString());
}
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