how to solve flutter CERTIFICATE_VERIFY_FAILED error while performing a POST request?

Question

I am sending a post request in Dart. It is giving a response when I test it on API testing tools such as Postman. But when I run the app. It gives me the following error:- <

Answer 1

Just for the sake of clarity specially for the new comers to flutter/dart, here is what you need to do in order to enable this option globally in your project:

1. In your main.dart file, add or import the following class:

 class MyHttpOverrides extends HttpOverrides{
  @override
  HttpClient createHttpClient(SecurityContext context){
    return super.createHttpClient(context)
      ..badCertificateCallback = (X509Certificate cert, String host, int port)=> true;
  }
}

2. In your main function, add the following line after function definition:

HttpOverrides.global = new MyHttpOverrides();

This comment was very helpful to pass through this matter

Answer 2

I specifically needed to use lib/client.dart Client interface for http calls (i.e. http.Client instead of HttpClient) . This was required by ChopperClient (link).

So I could not pass HttpClient from lib/_http/http.dart directly to Chopper. ChopperClient can receive HttpClient in the constructor wrapped in ioclient.IOClient.

HttpClient webHttpClient = new HttpClient();
webHttpClient.badCertificateCallback = ((X509Certificate cert, String host, int port) => true);
dynamic ioClient = new ioclient.IOClient(webHttpClient);
final chopper = ChopperClient(
  baseUrl: "https://example.com",
  client: ioClient,
  services: [
    MfService.create()
  ],
  converter: JsonConverter(),
);
final mfService = MfService.create(chopper);

This way you can temporarily ignore CERTIFICATE_VERIFY_FAILED error in your calls. Remember - that's only for development purposes. Don't use this in production environment!