An easy to use Http client for flutter.

http_client.dart

import 'dart:convert';

import 'package:dio/dio.dart';
import 'package:http/http.dart' as http;
import 'server_response.dart';

class HttpClient {

    static HttpClient instance = new HttpClient.internal();
    HttpClient.internal();
    factory HttpClient() => instance;

    final JsonDecoder decoder = new JsonDecoder();
    // creating a new dio instance
    final Dio request =  new Dio(); 

    // GET request
    Future<ServerResponse> getRequest(String url, { String token }) async {
        var uri = Uri.encodeFull(url);
        try {
            var response = await request.get(uri, options: Options(
                headers: { 'Authorization': 'Bearer $token' }
            ));
            if (response.statusCode < 200 || response.statusCode > 400 || json == null) {
                return ServerResponse(isSuccess: false, response: response.statusMessage);
            }
            return ServerResponse(isSuccess: true, response: response.data);
        } on DioError catch (error) {
            return ServerResponse(isSuccess: false, response: error.response != null ? error.response.statusMessage : error.message);
        }
    }

    // GET requests
    Future<ServerResponse> postRequest(String url, Map<String, dynamic> data, { String token }) async {
        var uri = Uri.encodeFull(url); //encode the url passed in param e.g http:://192.168.x.x:8003/api/
        try {
            FormData formData = new FormData.fromMap(data);
            var response = await request.post(uri, data: formData, options: Options(
                headers: { 'Authorization': 'Bearer $token' },
            ));
            if (response.statusCode < 200 || response.statusCode > 400 || json == null) {
                return ServerResponse(isSuccess: false, response: response.statusMessage);
            }
            return ServerResponse(isSuccess: true, response: response.data);
        } on DioError catch (error) {
            return ServerResponse(isSuccess: false, response: error.response != null ? error.response.statusMessage : error.message);
        }
    }
}

main.dart

/*
Using the HttpClient class
*/
import 'http_client.dart';

getUsers(){
  String accessToken = 'dad1....';
  String url="http://192.168.x.x:xxxx/api/users/"
  HttpClient.instance.getRequest(url, token: accessToken).then((response) {
    if (response.isSuccess) {
      print("response successful");
      print("response body: ${response.response}");
    }else {
      print("response failed");
      print("responseError: ${response.response} ");
    }
});
}

createUser(){
  Map<String,dynamic> data ={
    "full_name":"Nelson K",
    "username":"Nelson1995",
    "password":"1234"
  };
  String accessToken = 'dad1....';
  String url="http://192.168.x.x:xxxx/api/create"
  HttpClient.instance.postRequest(url,data,token: accessToken).then((response) {
    if(response.isSuccess){
      print("response successful");
      print("response body: ${response.response}");
    }else{
      print("response failed");
      print("responseError: ${response.response} ");
    }
});
}

server_response.dart

class ServerResponse {
    final bool isSuccess;
    final dynamic response;
    ServerResponse({this.isSuccess, this.response});
}