Allow unverified ssl certificates in WKWebView

Question

I'm trying to load a HTTPS url with an self-signed certificate in a WKWebView for iOS 8 and it keeps failing. The workaround used with UIWebView (using setAllowsAnyHTTPSCertificate from NSUrlRequest) doesn't seem to work. Does anyone know of any workaround?

I do not need a solution that is valid for AppStore, as I only need to access self-signed certificate sites on development phases, not on production, but it's really a problem for development and testing server instances.

Thank you in advance.

Answer 1

This is fixed in iOS 9! WKWebView finally makes calls to webView(_:didReceiveAuthenticationChallenge:completionHandler:) on WKNavigationDelegate. Unfortunately this does not work if you run code built in Xcode 7 on iOS 8 devices (at least not in my initial testing).

In my example below, I'm not actually doing anything with the cert and just letting it pass through without doing any further validation (obviously a bad plan for production code). See Apple's docs (Listing 3) for more details of what they want you to do here.

Swift:

func webView(webView: WKWebView, didReceiveAuthenticationChallenge challenge: NSURLAuthenticationChallenge,
    completionHandler: (NSURLSessionAuthChallengeDisposition, NSURLCredential?) -> Void) {
        let cred = NSURLCredential.init(forTrust: challenge.protectionSpace.serverTrust!)
        completionHandler(.UseCredential, cred)
}

Swift 3:

let cred = URLCredential(trust: challenge.protectionSpace.serverTrust!)
completionHandler(.useCredential, cred)

Swift 4:

func webView(_ webView: WKWebView, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
    let cred = URLCredential(trust: challenge.protectionSpace.serverTrust!)
    completionHandler(.useCredential, cred)
}

Objective-C

NSURLCredential * credential = [[NSURLCredential alloc] initWithTrust:[challenge protectionSpace].serverTrust];
completionHandler(NSURLSessionAuthChallengeUseCredential, credential);