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

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!