Error: A value of type 'RequestOptions' can't be assigned to a variable of type 'Future<dynamic>'

Question

I got below error when I compiling a flutter project downloaded from github .

here is the code:

import 'package:dio/dio.dart';

class HeaderInterceptors extends InterceptorsWrapper {
  @override
  onRequest(RequestOptions options) {
    // 超时
    options.connectTimeout = 15000;
    return options;
  }
}

and here is the mistake :

lib/common/service/interceptors/header_interceptor.dart:8:12: Error: A value of type 'RequestOptions' can't be assigned to a variable of type 'Future<dynamic>'.
 - 'RequestOptions' is from 'package:dio/src/options.dart' ('/D:/intellij/flutter_windows_1.22.5-stable/flutter/.pub-cache/hosted/pub.flutter-io.cn/dio-3.0.10/lib/src/options.dart').
 - 'Future' is from 'dart:async'.
    return options;
           ^

any idea?

Answer 1

InterceptorsWrapper.onRequest() is a void. To modify connectionTimeout, you can call RequestInterceptorHandler.next(RequestOptions) to update the config.

@override
void onRequest(RequestOptions options, RequestInterceptorHandler handler) {
  options.connectTimeout = 15000;
  handler.next(options);
}