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Hi, I implemented the NSPinnedDomains according to https://developer.apple.com/news/?id=g9ejcf8y "Identity Pinning: How to configure server certificates for your app". This is my config (I added a wrong SHA256 hash so I can test if it works): keyNSAppTransportSecurity/key dict     keyNSPinnedDomains/key     dict         keyjsonplaceholder.typicode.com/key         dict             keyNSPinnedCAIdentities/key             array                 dict                     keySPKI-SHA256-BASE64/key                     stringr/mIkG3eEpVdm+u/ko/cwxzOMo1bk4TyHIlByibiA5E=/string                 /dict             /array             keyNSIncludesSubdomains/key             true/         /dict     /dict /dict With NSURLSessions it properly fails when I try to load https://jsonplaceholder.typicode.com/todos/2 it prints following error: An SSL error has occurred and a secure connection to the server cannot be made But when I try to load the URL from JavaScript in WKWebView, it succeeds. Is WKWebView not supported? Or am I doing something wrong? Thanks and kind regards, Mika Objc code: NSString *urlString = @"https://jsonplaceholder.typicode.com/todos/2"; NSURL *url = [NSURL URLWithString:urlString]; NSURLSessionDataTask *downloadTask = [[NSURLSession sharedSession] dataTaskWithURL:url completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { }]; [downloadTask resume]; Web code (can be included in any html page inside WKWebView): script document.addEventListener("DOMContentLoaded", () = { fetch("https://jsonplaceholder.typicode.com/todos/2") .then(res = res.json()) .then(res = console.log(res)); }); /script