Alamofire 4 FAILURE: Error Domain=NSURLErrorDomain Code=-999 "cancelled" - ios

Question

Hi I am try to use Alamofire for my project but the error come out.
Here is my requesting code
//Google testing
Alamofire.request("http://google.com").responseString{
response in
debugPrint(response)
}.session.invalidateAndCancel()
Result]: FAILURE: Error Domain=NSURLErrorDomain Code=-999 "cancelled"
UserInfo={NSErrorFailingURLKey=http://google.com/,
NSLocalizedDescription=cancelled,
NSErrorFailingURLStringKey=http://google.com/}
//Own server testing
Alamofire.request("https://10.68.24.127:4533").responseString{
response in
debugPrint(response)
}.session.invalidateAndCancel()
same result
class NetworkManager {
var manager: SessionManager?
init() {
let serverTrustPolicies: [String: ServerTrustPolicy] = [
"https://10.68.24.127:4533" : .disableEvaluation
]
let configuration = URLSessionConfiguration.default
manager = Alamofire.SessionManager(
configuration: configuration,
serverTrustPolicyManager :ServerTrustPolicyManager(policies: serverTrustPolicies)
)
}
}
I set the NSAllowsArbitraryLoads to true and NSExceptionDomains.
Where is the problem?

Answer 1

There could be a lot of reason to why your requests "cancelled".
If you are facing that a request cancels immediately you can refer to this issue in Alamofire repository issues
jshier commented on Oct 10, 2016
An unexpected error -999 almost always means your SessionManager was
deallocated, cancelling any ongoing requests. I suggest you create a
singleton value for your custom SessionManager, or perhaps just
reevaluate if you really need one.
if you create a singleton value for your object it remains in memory and prevent from deallocate
and another thing that i avoid is to name your variables diffrent, a sessionManager is in Alamofire and your variable is also called sessionManager.
Alamofire 4.7 , Swift 4
import Alamofire
class Networking {
public static let sharedManager: SessionManager = {
let configuration = URLSessionConfiguration.default
configuration.timeoutIntervalForRequest=20
let manager = Alamofire.SessionManager(configuration: configuration, delegate: SessionManager.default.delegate)
return manager
}()
}
Alamofire 5.4.4 , Siwft 5.2
import Alamofire
class Networking {
static let APIManager: Session = {
let configuration = URLSessionConfiguration.default
configuration.timeoutIntervalForRequest = 20
let delegate = Session.default.delegate
let manager = Session.init(configuration: configuration,
delegate: delegate,
startRequestsImmediately: true,
cachedResponseHandler: nil)
return manager
}()
}

Answer 2

Check this documentation from Alamofire app-transport-security
try to add the following in your .plist file
<key>NSAppTransportSecurity</key><dict>
<key>NSExceptionDomains</key>
<dict>
<key>url.com</key>
<dict>
<key>NSExceptionAllowsInsecureHTTPLoads</key>
<true/>
<key>NSExceptionRequiresForwardSecrecy</key>
<false/>
<key>NSIncludesSubdomains</key>
<true/>
</dict>
</dict>

Answer 3

Most likely you should be checking if there is an implementation of authentication challenge delegate method and check if its calling NSURLSessionAuthChallengeCancelAuthenticationChallenge.
- (void)URLSession:(NSURLSession *)session didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge
completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential * _Nullable credential))completionHandler