Handshake Exception Handshake error in client (OS Error: Certificate Verify Failed Application Verification Failure Handshake.cc:393)

[AmmarMohamed21]

I have a flutter app which works well for many users Android and iOS
A single user receives this exception while sending a post request

Handshake Exception Handshake error in client (OS Error: Certificate Verify Failed Application Verification Failure Handshake.cc:393)

his device is iPad 6, iOS 14.8.1

what could be the problem?

[hurkanugur]

If you use HTTPS and receive this error, you must make your HTTP client trust the server you wish to send requests.
To do this:

1. You need to download the web certificate and put it in the assets folder
2. Read the web certificate and set it as a trusted certificate
3. Inject it into your HTTP client

Example Code:

// Load from assets
final ByteData certificateData = await rootBundle.load('assets/my_certificate.cer');

// Make the SecurityContext.defaultContext trust your certificate
SecurityContext.defaultContext.setTrustedCertificatesBytes(certificateData.buffer.asUint8List());

// Inject SecurityContext.defaultContext into your HTTP client
final http.Client client = http.Client();
final HttpClient httpClient = HttpClient(context: SecurityContext.defaultContext);
final http.Client clientWithHttpClient = http.Client(
  httpClient: httpClient,
);

Note that I don't use this http client (I'm using Dio package for this).
So I don't know whether the last part of the code works or not.
I hope it works for you!

[deezaster]

What happens when the certificate after expiring is refreshed? Do I have do donwload the certificate again?

[natebosch]

Closing since there aren't any changes we can make in this package to impact security behavior. See comments for dart:io usable workarounds.

Questions about specific implementation patterns are best asked in places like stack overflow or the flutter discord.

[devDawata]

Any solution for this