flutter_inappwebview 本地 https 连接在 flutter 应用中被拒绝

Question

我正在尝试通过 https 提供资产中的本地内容，以便访问需要 ssl 的 webrtc 等功能。

由于 flutter_inappwebview 中提供了本地应用服务器不处理 ssl 连接，我用 InAppLocalHostSecureServer 替换了 InAppLocalHostServer class，代码如下：

import 'dart:io';
import 'dart:async';

import 'package:flutter/services.dart' show rootBundle;
import 'package:mime/mime.dart';

class InAppLocalHostSecureServer {
  HttpServer _server;
  int _port = 8443;

  InAppLocalHostSecureServer({int port = 8443}) {
    this._port = port;
  }

  ///Starts a server on http://localhost:[port]/.
  ///
  ///**NOTE for iOS**: For the iOS Platform, you need to add the `NSAllowsLocalNetworking` key with `true` in the `Info.plist` file (See [ATS Configuration Basics](https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html#//apple_ref/doc/uid/TP40009251-SW35)):
  ///```xml
  ///<key>NSAppTransportSecurity</key>
  ///<dict>
  ///    <key>NSAllowsLocalNetworking</key>
  ///    <true/>
  ///</dict>
  ///```
  ///The `NSAllowsLocalNetworking` key is available since **iOS 10**.
  Future<void> start() async {
    if (this._server != null) {
      throw Exception('Server already started on https://localhost:$_port');
    }

    var completer = Completer();

    runZoned(() async {
      SecurityContext context = new SecurityContext();
      var chain = await rootBundle.load('assets/certificates/cert.pem');
      var key = await rootBundle.load('assets/certificates/key.pem');
      context.useCertificateChainBytes(chain.buffer.asInt8List());
      context.usePrivateKeyBytes(key.buffer.asInt8List(), password: 'dartdart');

      HttpServer.bindSecure('127.0.0.1', _port, context).then((server) {
        print('Server running on https://localhost:' + _port.toString());

        this._server = server;

        server.listen((HttpRequest request) async {
          print(request);
          var body = List<int>();
          var path = request.requestedUri.path;
          path = (path.startsWith('/')) ? path.substring(1) : path;
          path += (path.endsWith('/')) ? 'index.html' : '';

          try {
            body = (await rootBundle.load(path)).buffer.asUint8List();
          } catch (e) {
            print(e.toString());
            request.response.close();
            return;
          }

          var contentType = ['text', 'html'];
          if (!request.requestedUri.path.endsWith('/') &&
              request.requestedUri.pathSegments.isNotEmpty) {
            var mimeType =
                lookupMimeType(request.requestedUri.path, headerBytes: body);
            if (mimeType != null) {
              contentType = mimeType.split('/');
            }
          }

          request.response.headers.contentType =
              ContentType(contentType[0], contentType[1], charset: 'utf-8');
          request.response.add(body);
          request.response.close();
        });

        completer.complete();
      });
    }, onError: (e, stackTrace) {
      print('Error: $e $stackTrace');
    });

    return completer.future;
  }

  ///Closes the server.
  Future<void> close() async {
    if (this._server != null) {
      await this._server.close(force: true);
      print('Server running on http://localhost:$_port closed');
      this._server = null;
    }
  }
}

大部分代码是原始代码的复制粘贴class。

我改变的是我调用 HttpServer.bindSecure 而不是 HttpServer.bind 并且我提供 openssl 证书和密钥。

服务器似乎启动时没有在控制台中记录错误，但我无法访问它。

这是尝试访问本地 url 的客户端代码：


import 'package:flutter/material.dart';
import 'package:flutter_inappwebview/flutter_inappwebview.dart';
import 'InAppLocalHostSecureServer.dart';

class WebAudioTest extends StatefulWidget {
  @override
  _WebAudioTestState createState() => _WebAudioTestState();
}

class _WebAudioTestState extends State<WebAudioTest> {
  InAppWebViewController webView;
  InAppLocalHostSecureServer localhostServer;
  String url = "https://127.0.0.1:8443/assets/web/index.html";

  @override
  void initState() {
    super.initState();
    this.init();
  }

  void init() async {
    this.localhostServer = new InAppLocalHostSecureServer();
    await localhostServer.start();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Web Audio Test'),
      ),
      body: InAppWebView(
        initialUrl: url,
        initialHeaders: {},
        initialOptions: InAppWebViewGroupOptions(
            crossPlatform: InAppWebViewOptions(
          debuggingEnabled: true,
        )),
        onWebViewCreated: (InAppWebViewController c) {
          webView = c;
        },
        onConsoleMessage: (controller, consoleMessage) {
          print("CONSOLE MESSAGE: " + consoleMessage.message);
        },
      ),
    );
  }
}

console没有报错但是flutter页面报错如下：

网络::ERR_CONNECTION_REFUSED

欢迎任何帮助。

Answer 1

好的，回答我自己的问题：

我遇到的问题很简单，我过早地构建了 InAppWebView，在服务器完成启动之前。解决办法很简单，只要在服务器启动时设置一个标志为真，只有当标志为真时才创建 InAppWebView。

除此之外，WebRTC 在本地主机上无需 https 即可运行，我在 Android 和 iOS 上对其进行了测试。因此，此用例不需要本地 https。

但是无论如何，如果出于任何其他原因有人需要提供 https 本地内容，此 post 中的代码可以作为其基础。

flutter_inappwebview 本地 https 连接在 flutter 应用中被拒绝

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