Post serialised Json body - [VERBOSE-2:ui_dart_state.cc(177)] Unhandled Exception: Error-

Question

I have been stuck for the last 2 days regarding flutter post method with JSON row body, the code which I have tried is shown here.

Code 1:

void send() async {

    userModel = UserModel(userName: "usernme", password: "password");

       var response = await http.post(
           "https://stagingapi......",
           headers: {"Content-Type": "application/json"},
           body: json.encode(userModel.toJson()));


       print(response.body);
       print(response.statusCode);

}

I have created serialised body Model like,

import 'package:json_annotation/json_annotation.dart';

part 'UserModel.g.dart';

@JsonSerializable()
class UserModel {
  String userName;
  String password;
  // String xyz;
  UserModel({this.userName, this.password});
  factory UserModel.fromJson(Map<String, dynamic> json) => _$UserModelFromJson(json);
  Map<String, dynamic> toJson() => _$UserModelToJson(this);
}

Code 2:-

Future<User> createUser(String username, String password) async{
  final String apiUrl = "https://stagingapi.....";
  Map<String,String> headers = {'Content-Type':'application/json'};
  final body = jsonEncode({ "userName": username,
    "password": password});
  try {
    var response = await http.post(apiUrl, headers: headers, body: body);
    print(response.statusCode);
    if(response.statusCode == 201){
      final String responseString = response.body;

      return userFromJson(responseString);
    }else{
      return null;
    }
  } catch (error) {
    print('error- $error');
   
    }
  }
}

In both cases or if I try any post code method it throws the following error,

[VERBOSE-2:ui_dart_state.cc(177)] Unhandled Exception: 
#0      IOClient.send (package:http/src/io_client.dart:65:7)
<asynchronous suspension>
#1      BaseClient._sendUnstreamed (package:http/src/base_client.dart:176:38)
#2      BaseClient.post (package:http/src/base_client.dart:58:7)
#3      post.<anonymous closure> (package:http/http.dart:70:16)
#4      _withClient (package:http/http.dart:166:20)
#5      post (package:http/http.dart:69:5)
#6      _SelectDOBState.send (package:kash_app/SelectDOB.dart:99:29)
#7      _SelectDOBState.initState (package:kash_app/SelectDOB.dart:92:6)
#8      StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4812:57)
#9      ComponentElement.mount (package:flutter/src/widgets/framework.dart:4649:5)
#10     Element.inflateWidget (package:flutter/src/widgets/framework.dart:3615:14)
#11     Element.updateChild (package:flutter/src/widgets/framework.dart:3380:18)
#12     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:616<…>

Answer 1

The above code is working in other urls...I have resolved this issue, it was from our backend team made some changes to domain url by adding some configuration in IIS OR secure certificate related