iOS Error Code=-1003 "A server with the specified hostname could not be found."

Question

I am trying to load image from URL on the iphone, image is there and I can open it in safari with same link, but not in the app:

Error Domain=NSURLErrorDomain Code=-1003 "A server with the specified hostname  could not be found." UserInfo={NSUnderlyingError=0x17024f810  {Error Domain=kCFErrorDomainCFNetwork Code=-1003 "(null)"  UserInfo={_kCFStreamErrorCodeKey=50331647, _kCFStreamErrorDomainKey=6147928288}},  NSErrorFailingURLStringKey=https://........, NSErrorFailingURLKey=https://......... 

Code of request:

func downloadImage(userEmail: String, onCompletion: @escaping (UIImage) -> Void) {     print("Download Started")     let route = "\(baseURL as String)\(userEmail as String)\(baseURLparameters as String)"     let url = URL(string: route)      getDataFromUrl(url: url!) { (data, response, error)  in         guard let data = data, error == nil else {             print("===failed:", error ?? "dunno")             print("===url:", url?.absoluteString ?? "dunno")             return         }         print(response?.suggestedFilename ?? url!.lastPathComponent )         print("Download Finished")         DispatchQueue.main.async() { () -> Void in             onCompletion(UIImage(data: data)!)         }     }  } 

Answer 1

In my case, when I connect the signing team account to Xcode it was automatically switch on the App Sandbox in Capabilities. When I turn off it I could do server request without any problems.

Answer 2

Slight improvement over Udaya Sri's answer:

Explicitly allow for network connections while keeping the sandbox enabled like so: