如何将 badCertificateCallback 添加到 http.BaseClient [Flutter, Dart]

Question

我正在使用 signalr_core 连接到 signalr。我创建了如下代码，这个连接没有问题。

  SignalRNotification() {
    if (this._hubConnection == null) {
      var options =
          IOClient(HttpClient()..badCertificateCallback = (x, y, z) => true);
      this._hubConnection = HubConnectionBuilder()
          .withUrl(serverUrl, options)
          .withAutomaticReconnect()
          .build();
    }

    this._initHub();
  }

我想修改选项里的header信息

我添加了一个 header 引用 this article. 但是，出现 CERTIFICATE_VERIFY_FAILED 错误。

E/flutter ( 2902): [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: HandshakeException: Handshake error in client (OS Error: 
E/flutter ( 2902):  CERTIFICATE_VERIFY_FAILED: unable to get local issuer certificate(handshake.cc:354))

这是我的代码。

import 'dart:io';
import 'package:http/io_client.dart';
import 'package:signalr_core/signalr_core.dart';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'package:flutter/foundation.dart';
import '../resources/common.dart';

class _HttpClient extends http.BaseClient {
  final _httpClient = http.Client();

  final Map<String, String> defaultHeaders;

  _HttpClient({@required this.defaultHeaders});

  @override
  Future<http.StreamedResponse> send(http.BaseRequest request) {
    request.headers.addAll(defaultHeaders);
    return _httpClient.send(request);
  }
}

class SignalRNotification {
  static String serverUrl = SignalRURL;
  HubConnection _hubConnection;
  NotificationManager notificationManager = NotificationManager();
  final httpClient = _HttpClient(defaultHeaders: {
    "X-Api-Key": "key",
    "X-Client-Id": "id",
  });

  SignalRNotification() {
    if (this._hubConnection == null) {
      this._hubConnection = HubConnectionBuilder()
          .withUrl(serverUrl, HttpConnectionOptions(client: httpClient))
          .withAutomaticReconnect()
          .build();
    }

    this._initHub();
  }

我认为出现这个问题是因为_HttpClient中没有badCertificateCallback

我也参考了this article，但是没用。我想知道解决方案。

Answer 1

来自 dart:io 的

HttpClient（我将其称为 io.HttpClient）提供了 badCertificateCallback setter 但 package:http 的 BaseClient 确实没有。

但是，package:http 为其 BaseClient class 提供了几种实现。其中之一是 IOClient（我将其称为 http.IOClient），它由 io.HttpClient.

支持

因此，您应该能够将 http.IOClient 与按您希望的方式配置的 io.HttpClient 一起使用，例如：

import 'dart:io' as io;
import 'package:http/http.dart' as http;
import 'package:http/io_client.dart' as http;

class _HttpClient extends http.BaseClient {
  final io.HttpClient _ioHttpClient;
  final http.IOClient _httpClient;

  final Map<String, String> defaultHeaders;

  _HttpClient({@required this.defaultHeaders})
     : _ioHttpClient = io.HttpClient() {
    _httpClient = http.IOClient(_ioHttpClient);
  }

  void set badCertificateCallback(BadCertificateCallback callback) =>
    _ioHttpClient.badCertificateCallback = callback;

  @override
  Future<http.StreamedResponse> send(http.BaseRequest request) {
    request.headers.addAll(defaultHeaders);
    return _httpClient.send(request);
  }
}

如何将 badCertificateCallback 添加到 http.BaseClient [Flutter, Dart]

How to add badCertificateCallback to the http.BaseClient [Flutter, Dart]

signalr

dart

flutter