UnityWebRequest SSL/TLS certificate validation?

Unity Engine
1

I am developing a WEBGL app which needs to interact with a REST API via https where the server certificate is untrusted. Since I cannot use System.Net on WebGL I tried to use the new UnityWebRequest but I found nothing where to handle certificates.
In System.Net I would do something like this:

ServicePointManager.ServerCertificateValidationCallback += (sender, certificate, chain, errors) => true;

When I try a simple “POST” I always get “Unknown Error” and responseCode == 0;

    IEnumerator Authentification()
    {
        var fu = @"{""data1"": ""fudata"",""data2"": ""fudata2""}";
        byte[] payload = new byte[fu.Length * sizeof(char)];

        System.Buffer.BlockCopy(fu.ToCharArray(),0,payload,0, payload.Length);

        UploadHandler upload = new UploadHandlerRaw(payload);
        upload.contentType = "application/json";
       
        UnityWebRequest request = new UnityWebRequest("https://someSide.com/PostRequest");
        request.uploadHandler = upload;

        yield return request.Send();

        if(request.isError)
        {
            Debug.Log(request.error + request.errorCode);
        }
        else
        {
            Debug.Log(request.downloadHandler.text);
        }
    }

If something like this is not possible, is there some kind of workaround?

1 Like
2

I have the same problem. I’m so glad I found your post, @zlSimon . It helped me realize the https in my url was causing my “Unknown Error.”

3

Some way to handle certificate validation would be handy… any word on this?

4

Same problem on my side. Any news about that?

5

Hello guys!
Check my plugin for Unity, working with promises is better!
GitHub - proyecto26/RestClient: 🦄 A Promise based REST and HTTP client for Unity 🎮 (Supported all platforms)
Also you can see the demo, it’s very easy!
Let me know what you think, Nicholls

6

Still searching for a solution to this issue…

7

Custom TLS certificate validation is supported since Unity 2018.1 (currently beta).