[Flutter] Rest API (Dio)

1. 패키지 참조 (pubspec.yaml)

dependencies:
  dio: ^4.0.4

import 'package:dio/dio.dart';

---

Method - GET

TextButton(
  onPressed: () async {
    var result = await Dio().get(
        "http://localhost:3000/organization",
        queryParameters: {
          "country": "Honduras"
        });
    print(result.data.toString());
  },
  child: const Text("GET")
),

---

Method - POST

TextButton(
  onPressed: () async {
    var result = await Dio().post(
        "http://localhost:3000/admin/login-admin",
        data: '{ "Id" : "admin", "Pw" : "admin"}');
    print(result.data.toString());
  },
  child: const Text("POST")),

---

Method - PUT

TextButton(
  onPressed: () async {
    var result = await Dio().put(
        "http://localhost:3000/admin/login-admin",
        data: '{ "Id" : "admin", "Pw" : "admin"}');
    print(result.data.toString());
  },
  child: const Text("PUT")),

---

Method - DELETE

TextButton(
  onPressed: () async {
    var result = await Dio().delete(
        "http://localhost:3000/organization",
        queryParameters: {
          "category": "Other State",
        });
    print(result.data.toString());
  },
  child: const Text("DELETE")),