I don't know where the problem is with my code. After handler.reslove(res), the return value of the original request is always empty.

[jackie-weiwei]

Request Statement

import 'dart:io';
import 'package:dio/dio.dart';
import 'package:dio/io.dart';
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
class RestApi {
  late Dio _dio;
  late Dio _dio2;
  late String _token;
  late String _token2;
  get dio => _dio;
  static final RestApi _instance = RestApi._interal();
  factory RestApi() => _instance;
  RestApi._interal() {
    _dio = Dio();
    _dio2 = Dio();
  }
  void readToken() async {
    SharedPreferences pref = await SharedPreferences.getInstance();
    String? token = pref.getString("token");
    String? token2 = pref.getString("token2");
    if (token == null) {
      _token = "";
    }
    if (token2 == null) {
      _token2 = "";
    }
  }
  void saveToken() async {
    SharedPreferences pref = await SharedPreferences.getInstance();
    pref.setString("token", _token);
    pref.setString("token2", _token2);
  }
  init(
      {String? baseUrl,
      int? connectTmo,
      int? receiveTmo,
      int? sendTmo,
      String? pem}) async {
    readToken();
    baseUrl = baseUrl ?? "";
    connectTmo = connectTmo ?? 0;
    receiveTmo = receiveTmo ?? 0;
    sendTmo = sendTmo ?? 0;
    BaseOptions option = BaseOptions(
        baseUrl: baseUrl,
        connectTimeout: Duration(seconds: connectTmo),
        receiveTimeout: Duration(seconds: receiveTmo),
        sendTimeout: Duration(seconds: sendTmo));
    _dio = Dio(option);
    _dio2 = Dio(option);
    if (pem != null) {
      _dio.httpClientAdapter = IOHttpClientAdapter(
        createHttpClient: () {
          final client = HttpClient(
            context: SecurityContext(withTrustedRoots: false),
          );
          client.badCertificateCallback = (cert, host, port) => true;
          return client;
        },
        validateCertificate: (cert, host, port) {
          if (cert == null) return false;
          return cert.pem == pem;
        },
      );
      _dio2.httpClientAdapter = IOHttpClientAdapter(
        createHttpClient: () {
          final client = HttpClient(
            context: SecurityContext(withTrustedRoots: false),
          );
          client.badCertificateCallback = (cert, host, port) => true;
          return client;
        },
        validateCertificate: (cert, host, port) {
          if (cert == null) return false;
          return cert.pem == pem;
        },
      );
    }
    _dio.interceptors.add(QueuedInterceptorsWrapper(
      onRequest: (options, handler) async {
        options.headers["access"] = _token;
        return handler.next(options); //continue
      },
      onResponse: (response, handler) {
        debugPrint(response.requestOptions.path);
        String path = response.requestOptions.path;
        if (path.contains("login")) {
          _token = response.data["accessToken"];
          _token2 = response.data["refreshToken"];

          debugPrint(response.data);
        }
        return handler.next(response); // continue
      },
      onError: (error, handler) async {
        if (error.response?.statusCode == 401) {
          bool bSucc = await refreshToken();
          if (bSucc) {
            var res = await _dio.fetch(error.response!.requestOptions);
            handler.resolve(res); //continue
          } else {
            handler.next(error);
          }
        } else {
          handler.next(error);
        }
      },
    ));
  }

  Future post({
    required String path,
    dynamic data,
    Map<String, dynamic>? queryParameters,
  }) {
    Options options = Options(
      method: "post",
    );
    return _dio.request(
      path,
      data: data,
      queryParameters: queryParameters,
      options: options,
    );
  }
  Future<bool> refreshToken() async {
    Options options = Options(
      method: "post",
      headers: {"refresh": _token2},
    );
    Response response = await _dio2.request(
      "/refresh_token/refresh",
      data: {"mobile": "138999999999"},
      options: options,
    );
    _token = response.data["access"];
    return true;
    // try {} on DioException catch (_) {
    //   return false;
    // } finally {}
  }
}

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[jackie-weiwei]

[jackie-weiwei]

I'm at my wits' end, please help.

[AlexV525]

Please provide a minimal reproducible example rather than nested implementations, and use discussions for general issues. Also the template is for feature requests.