How to do it...

To perform a DELETE 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: Delete Pizza
   • Verb: DELETE
   • Address: /pizza
   • Status: 200
   • Body: {"message": "Pizza was deleted"}:

3. In the Flutter project, add a deletePizza method to the HttpHelper class in the http_helper.dart file:

Future<String> deletePizza(int id) async {
    Uri url = Uri.https(authority, deletePath);
    http.Response r = await http.delete(
      url,
    );
    return r.body;
  }

4. In the main.dart file, in the build method of the _MyHomePageState class, refactor itemBuilder of ListView.builder so that ListTile is contained in a Dismissible widget, as follows:

return ListView.builder(
    itemCount: (pizzas.data == null) ? 0 : pizzas.data.length,
    itemBuilder: (BuildContext context, int position) {
        return Dismissible...