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如何解决执行POST请求时出现的CERTIFICATE_VERIFY_FAILED错误？

问题内容：

我正在Dart中发送发帖请求。当我在Postman等API测试工具上进行测试时，它会给出响应。但是当我运行该应用程序时。它给了我以下错误：

E/flutter ( 6264): HandshakeException: Handshake error in client (OS Error: E/flutter ( 6264):  CERTIFICATE_VERIFY_FAILED: unable to get local issuer certificate(handshake.cc:363))

这是我的函数代码-

Future getAccessToken(String url) async {

    try {
      http.post('url',
          body: {
            "email": "xyz@xyz.com",
            "password": "1234"
          }).then((response) {
        print("Reponse status : ${response.statusCode}");
        print("Response body : ${response.body}");
        var myresponse = jsonDecode(response.body);
        String token = myresponse["token"];
      });
    } catch (e) {
      print(e.toString());
    }

这是完整的错误正文：

E/flutter ( 6264): [ERROR:flutter/shell/common/shell.cc(184)] Dart Error: Unhandled exception: E/flutter ( 6264): HandshakeException: Handshake error in client (OS Error: E/flutter ( 6264):   CERTIFICATE_VERIFY_FAILED: unable to get local issuer certificate(handshake.cc:363)) E/flutter ( 6264): #0      IOClient.send (package:http/src/io_client.dart:33:23) E/flutter ( 6264): <asynchronous suspension> E/flutter ( 6264): #1      BaseClient._sendUnstreamed (package:http/src/base_client.dart:169:38) E/flutter ( 6264): <asynchronous suspension> E/flutter ( 6264): #2     BaseClient.post (package:http/src/base_client.dart:54:7) E/flutter ( 6264): #3      post.<anonymous closure> (package:http/http.dart:70:16) E/flutter ( 6264): #4      _withClient (package:http/http.dart:166:20) E/flutter ( 6264): <asynchronous suspension> E/flutter ( 6264): #5     post (package:http/http.dart:69:5) E/flutter ( 6264): #6     
_MyLoginFormState.getAccessToken (package:chart/main.dart:74:7) E/flutter ( 6264): <asynchronous suspension> E/flutter ( 6264): #7    
_MyLoginFormState.build.<anonymous closure> (package:chart/main.dart:64:29)

问题答案：

我发现正确的方法（但很糟糕）是允许所有证书。

HttpClient client = new HttpClient();
client.badCertificateCallback = ((X509Certificate cert, String host, int port) => true);

String url ='xyz@xyz.com';

Map map = { 
     "email" : "email" , 
     "password" : "password"
};

HttpClientRequest request = await client.postUrl(Uri.parse(url));

request.headers.set('content-type', 'application/json');

request.add(utf8.encode(json.encode(map)));

HttpClientResponse response = await request.close();

String reply = await response.transform(utf8.decoder).join();

print(reply);