I am use URLSession to "POST" request, but sometimes when request on a road I get error code with difference error, more often: "Time out" This is example of error message that I saw in console "Error Domain=NSURLErrorDomain Code=-1009 "The Internet connection appears to be offline.""
But I can't catch this error in code, what I am do wrong?, also I get another code errors but it does not change situation.
Error message:
2020-11-25 09:52:07.456207+0200 TestApp[40176:2305710] Connection 4: received failure notification
2020-11-25 09:52:07.456344+0200 TestApp[40176:2305710] Connection 4: failed to connect 1:50, reason -1
2020-11-25 09:52:07.456771+0200 TestApp[40176:2305710] Connection 4: encountered error(1:50)
2020-11-25 09:52:07.459696+0200 TestApp[40176:2305710] Task <888AA895-677A-403B-A436-599FF55DB3BB>.<1> HTTP load failed, 0/0 bytes (error code: -1009 [1:50])
2020-11-25 09:52:07.460557+0200 Venom[40176:2305710] Task <888AA895-677A-403B-A436-599FF55DB3BB>.<1> finished with error [-1009]
Error Domain=NSURLErrorDomain Code=-1009 "The Internet connection appears to be offline." UserInfo={_kCFStreamErrorCodeKey=50, NSUnderlyingError=0x600000116880
{Error Domain=kCFErrorDomainCFNetwork Code=-1009 "(null)" UserInfo={_kCFStreamErrorCodeKey=50, _kCFStreamErrorDomainKey=1}}, _NSURLErrorFailingURLSessionTaskErrorKey=LocalDataTask
<888AA895-677A-403B-A436-599FF55DB3BB>.<1>, _NSURLErrorRelatedURLSessionTaskErrorKey=(
"LocalDataTask <888AA895-677A-403B-A436-599FF55DB3BB>.<1>"
), NSLocalizedDescription=The Internet connection appears to be offline.,
NSErrorFailingURLStringKey=https://link_to_my_request, NSErrorFailingURLKey=https://link_to_my_request, _kCFStreamErrorDomainKey=1}
My code:
func addPlayer(playerCode: String, completion: @escaping (Error?) -> ()) {
guard let url = URL(string: "\(url)") else { return }
var urlRequest = URLRequest(url: url)
urlRequest.httpMethod = "POST"
let playerCode = [playerCode]
let params = ["players": playerCode]
do {
let data = try JSONSerialization.data(withJSONObject: params, options: .init())
urlRequest.httpBody = data
urlRequest.setValue("application/json", forHTTPHeaderField: "content-type")
let sessionConfig = URLSessionConfiguration.default
sessionConfig.timeoutIntervalForRequest = 5.0
DispatchQueue.global(qos: .background).async {
URLSession(configuration: sessionConfig).dataTask(with: urlRequest) { (data, resp, err) in
guard let data = data else { return }
guard let resp = resp else { return }
print(data)
print(resp)
if (err as? URLError)?.code == .timedOut {
// Handle session timeout
// THIS PIACE OF CODE DOES NOT EXECUTED
print("Oops, what is going on")
}
guard let response = resp as? HTTPURLResponse, (200 ..< 530) ~= response.statusCode else {
print("Error: HTTP request failed")
return
}
if response.statusCode == 200 {
print("Status code is 200")
do {
let json = try JSONDecoder().decode(ListOfPlayers.self, from: data)
// I am do what I am want
} catch let jsonError {
print("Error json serialization \(jsonError)")
}
completion(nil)
} else if response.statusCode == 422 {
print("Status code is 422")
completion(nil)
return
}
}.resume()
}
} catch {
}
}
Printing the rawValues of all the possible URLError codes:
unknown: -1 cancelled: -999 badURL: -1000 timedOut: -1001 unsupportedURL: -1002 cannotFindHost: -1003 cannotConnectToHost: -1004 networkConnectionLost: -1005 dnsLookupFailed: -1006 httpTooManyRedirects: -1007 resourceUnavailable: -1008 notConnectedToInternet: -1009 redirectToNonExistentLocation: -1010 badServerResponse: -1011 userCancelledAuthentication: -1012 userAuthenticationRequired: -1013 zeroByteResource: -1014 cannotDecodeRawData: -1015 cannotDecodeContentData: -1016 cannotParseResponse: -1017 appTransportSecurityRequiresSecureConnection: -1022 fileDoesNotExist: -1100 fileIsDirectory: -1101 noPermissionsToReadFile: -1102 dataLengthExceedsMaximum: -1103 secureConnectionFailed: -1200 serverCertificateHasBadDate: -1201 serverCertificateUntrusted: -1202 serverCertificateHasUnknownRoot: -1203 serverCertificateNotYetValid: -1204 clientCertificateRejected: -1205 clientCertificateRequired: -1206 cannotLoadFromNetwork: -2000 cannotCreateFile: -3000 cannotOpenFile: -3001 cannotCloseFile: -3002 cannotWriteToFile: -3003 cannotRemoveFile: -3004 cannotMoveFile: -3005 downloadDecodingFailedMidStream: -3006 downloadDecodingFailedToComplete: -3007 internationalRoamingOff: -1018 callIsActive: -1019 dataNotAllowed: -1020 requestBodyStreamExhausted: -1021 backgroundSessionRequiresSharedContainer: -995 backgroundSessionInUseByAnotherProcess: -996 backgroundSessionWasDisconnected: -997
You can see that you are looking for notConnectedToInternet code. (the one with rawValue -1009)
So, your code might look like this:
switch (err as? URLError)?.code {
case .some(.timedOut):
// Handle session timeout
case .some(.notConnectedToInternet):
// Handle not connected to internet
default: break
}