Using WKWebView does not work

[nadinasovaiala]

Hi Adam, The connection does not succeed when using WKWebView instead of UIWebView. The log shows "Disconnected" right after "Start" is called (no matter how many times I try). I am using Swift 2.0 and I tried on simulator and also on multiple devices. The transport method is WebSockets (I also tried with Auto). Is this a known issue? Are you able to replicate it? Thanks.

[adamhartford]

But UIWebView does work for you? No issues connecting with WKWebView that I know of. What version of iOS are you trying with?

[nadinasovaiala]

Yes, UIWebView works fine. I tried using iOS 8.1 and 9.0

[adamhartford]

Are you using cookies for authentication by any chance?

[nadinasovaiala]

No cookies, no headers

[adamhartford]

When you're running the app, use the Safari developer tools to watch the JavaScript console for your app. Do you see any errors when you try to connect?

[nadinasovaiala]

I do get an error: [Error] XMLHttpRequest cannot load http://<url_here>/signalr/signalr/negotiate?clientProtocol=1.5&connectionData=%5B%7B%22name%22%3A%22hub%22%7D%5D&_=1447840328641. Origin null is not allowed by Access-Control-Allow-Origin.

[adamhartford]

Did you enable CORS on your server? Usually that looks like this:

public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        app.UseCors (CorsOptions.AllowAll); // <-- This is the important part.
        app.MapSignalR ();
    }
}

UIWebView does not respect CORS, but WKWebView does. I should probably mention this in the README. It would explain why UIWebView works for you, but WKWebView does not.

[nadinasovaiala]

You were right, it worked after updating the server. Thanks!