How to do it...

To perform a POST action on a web service, follow these steps :

1. Log into the Mock Lab service at https://app.mocklab.io/ and click on the Stubs section of the example API. Then, create a new Stub.

2. Complete the request, as follows:
   • Name: Post Pizza
   • Verb: POST
   • Address: /pizza
   • Status: 201
   • Body: {"message": "The pizza was posted"}:

3. Press the Save button.
4. In the Flutter project, in the httpHelper.dart file, in the HttpHelper class, create a new method called postPizza, as follows:

  Future<String> postPizza(Pizza pizza) async {
    String post = json.encode(pizza.toJson());
    Uri url = Uri.https(authority, postPath);
    http.Response r = await http.post(
      url,
      body: post,
    );
    return r.body;
  }

5. In the project, create a new file called pizza_detail.dart.

6. At the top of the new file, add the required imports:

import 'package:flutter/material.dart';
import 'pizza.dart';
import 'httphelper.dart';