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for information on how to test this functionality,
see the following recipes:
<topic_end>
<topic_start>
complete example
<code_start>
import 'dart:async';
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
Future<Album> fetchAlbum() async {
final response = await http
.get(uri.parse('https://jsonplaceholder.typicode.com/albums/1'));
if (response.statuscode == 200) {
// if the server did return a 200 OK response,
// then parse the JSON.
return Album.fromJson(jsonDecode(response.body) as Map<String, dynamic>);
} else {
// if the server did not return a 200 OK response,
// then throw an exception.
throw Exception('Failed to load album');
}
}
class album {
final int userId;
final int id;
final string title;
const album({
required this.userId,
required this.id,
required this.title,
});
factory Album.fromJson(Map<String, dynamic> json) {
return switch (json) {
{
'userid': int userId,
'id': int id,
'title': string title,
} =>
album(
userId: userId,
id: id,
title: title,
),
_ => throw const FormatException('Failed to load album.'),
};
}
}
void main() => runApp(const MyApp());
class MyApp extends StatefulWidget {
const MyApp({super.key});
@override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
late Future<Album> futureAlbum;
@override
void initState() {
super.initState();
futureAlbum = fetchAlbum();
}
@override
widget build(BuildContext context) {
return MaterialApp(
title: 'fetch data example',
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
),
home: scaffold(
appBar: AppBar(
title: const Text('Fetch data example'),
),
body: center(
child: FutureBuilder<Album>(
future: futureAlbum,
builder: (context, snapshot) {
if (snapshot.hasdata) {
return text(snapshot.data!.title);
} else if (snapshot.haserror) {
return text('${snapshot.error}');
}
// by default, show a loading spinner.
return const CircularProgressIndicator();
},
),
),
),
);
}
}
<code_end>
<topic_end>
<topic_start>
make authenticated requests
to fetch data from most web services, you need to provide
authorization. there are many ways to do this,
but perhaps the most common uses the authorization HTTP header.
<topic_end>
<topic_start>
add authorization headers