Hello Folks I have a Custom UrlSessionDeleagte which is checking server authentication by overriding method func urlSession(_ session: URLSession, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Swift.Void) { if (challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust) { let serverTrust = challenge.protectionSpace.serverTrust // Applying additional validations. if(validated) { completionHandler(.useCredential, URLCredential(trust:serverTrust)) } } else { completionHandler(.performDefaultHandling, nil) } Initialized URL Session as below and reusing it in subsequent requests. if(urlSession != nil) { urlSession = URLSession(configuration: URLSessionConfiguration.Default, delegate: customURLSessionDelegate, delegateQueue : nil) } Now the issue is the uncertainty in response time First request - say took approx 11 secs. Second request if send immediately (< 2 secs difference from last call) - took only 0.2 secs or 1.2 secs. Third request if send after >20 secs - took again 12 secs. I want to know whether it is an implementation issue, or iOS behavior of handling the Server trust Authentication process in this way? Because the time it took after initializing a DataTask to checking server Auth differes. Also when call is sent immdiately it does not checkk Authentication again, but when send a after ~20 secs debugger fall on the Authentication method again, even if the URlsession instance was same.

I want to get the system trust store in iOS which has trusted root certificates embedded in iOS. From other posts, I learned that we can anchor root certificates manually in SecTrust. But not finding a way to get the default trust object. Please help!