POST, DELETE and PUT Requests

 Preparation

Before starting we’ll need to add http as a dependency, so let’s edit our pubspec.yaml file and add http:

dependencies:
  http: <latest_version>

Then we’ll just need to do a good old flutter pub get and import it in our file. I will use as a test case an ideal API Wrapper in order to call a single function to do all the work for us:

POST, DELETE and PUT

Those three methods work similarly to GET but we expect to add some body parameters. Fear not gentle developer!

With the call we can add a String body with a jsonEncoded Map<String,String> which will be body parameters: then we only need to use http package with post, delete or put method:

Ex

import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(

        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);



  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  Future<void> createAlbum() async {
    final headers = {
      'Content-Type': 'application/json; charset=UTF-8',
    };

    Map<String, dynamic> body = {
      'title': "praveen",
    };
    final http.Response response = await http.post(
      Uri.parse('https://jsonplaceholder.typicode.com/albums'),
      headers:headers,
      body: jsonEncode(body),
    );

    if (response.statusCode == 201) {
      print(response.body);
    } else {
      throw Exception('Failed to create album.');
    }
  }




  @override
  void initState() {
    // TODO: implement initState

    createAlbum();

    super.initState();
  }


  @override
  Widget build(BuildContext context) {

    return Scaffold(
      appBar: AppBar(

        title: Text(widget.title),
      ),
      body: Center(

        child: Column(

          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          createAlbum();
        },
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

Output