NS_ERROR_ENUM(NSURLErrorDomain)

{

    NSURLErrorUnknown = -1,

    NSURLErrorCancelled = -999,

    NSURLErrorBadURL = -1000,

    NSURLErrorTimedOut = -1001,

    NSURLErrorUnsupportedURL = -1002,

    NSURLErrorCannotFindHost = -1003,

    NSURLErrorCannotConnectToHost = -1004,

    NSURLErrorNetworkConnectionLost = -1005,

    NSURLErrorDNSLookupFailed = -1006,

    NSURLErrorHTTPTooManyRedirects = -1007,

    NSURLErrorResourceUnavailable = -1008,

    NSURLErrorNotConnectedToInternet = -1009,

    NSURLErrorRedirectToNonExistentLocation = -1010,

    NSURLErrorBadServerResponse = -1011,

    NSURLErrorUserCancelledAuthentication = -1012,

    NSURLErrorUserAuthenticationRequired = -1013,

    NSURLErrorZeroByteResource = -1014,

    NSURLErrorCannotDecodeRawData =            -1015,

    NSURLErrorCannotDecodeContentData =        -1016,

    NSURLErrorCannotParseResponse =            -1017,

    NSURLErrorAppTransportSecurityRequiresSecureConnectionAPI_AVAILABLE(macos(10.11), ios(9.0), watchos(2.0), tvos(9.0)) = -1022,

    NSURLErrorFileDoesNotExist = -1100,

    NSURLErrorFileIsDirectory = -1101,

    NSURLErrorNoPermissionsToReadFile = -1102,

    NSURLErrorDataLengthExceedsMaximumAPI_AVAILABLE(macos(10.5), ios(2.0), watchos(2.0), tvos(9.0)) = -1103,

    NSURLErrorFileOutsideSafeAreaAPI_AVAILABLE(macos(10.12.4), ios(10.3), watchos(3.2), tvos(10.2)) = -1104,

    // SSL errors

    NSURLErrorSecureConnectionFailed = -1200,

    NSURLErrorServerCertificateHasBadDate = -1201,

    NSURLErrorServerCertificateUntrusted = -1202,

    NSURLErrorServerCertificateHasUnknownRoot = -1203,

    NSURLErrorServerCertificateNotYetValid = -1204,

    NSURLErrorClientCertificateRejected = -1205,

    NSURLErrorClientCertificateRequired = -1206,

    NSURLErrorCannotLoadFromNetwork = -2000,

    // Download and file I/O errors

    NSURLErrorCannotCreateFile = -3000,

    NSURLErrorCannotOpenFile = -3001,

    NSURLErrorCannotCloseFile = -3002,

    NSURLErrorCannotWriteToFile = -3003,

    NSURLErrorCannotRemoveFile = -3004,

    NSURLErrorCannotMoveFile = -3005,

    NSURLErrorDownloadDecodingFailedMidStream = -3006,

    NSURLErrorDownloadDecodingFailedToComplete =-3007,

    NSURLErrorInternationalRoamingOffAPI_AVAILABLE(macos(10.7), ios(3.0), watchos(2.0), tvos(9.0)) =        -1018,

    NSURLErrorCallIsActiveAPI_AVAILABLE(macos(10.7), ios(3.0), watchos(2.0), tvos(9.0)) =                    -1019,

    NSURLErrorDataNotAllowedAPI_AVAILABLE(macos(10.7), ios(3.0), watchos(2.0), tvos(9.0)) =                  -1020,

    NSURLErrorRequestBodyStreamExhaustedAPI_AVAILABLE(macos(10.7), ios(3.0), watchos(2.0), tvos(9.0)) =      -1021,

    NSURLErrorBackgroundSessionRequiresSharedContainerAPI_AVAILABLE(macos(10.10), ios(8.0), watchos(2.0), tvos(9.0)) = -995,

    NSURLErrorBackgroundSessionInUseByAnotherProcessAPI_AVAILABLE(macos(10.10), ios(8.0), watchos(2.0), tvos(9.0)) = -996,

    NSURLErrorBackgroundSessionWasDisconnectedAPI_AVAILABLE(macos(10.10), ios(8.0), watchos(2.0), tvos(9.0))= -997,

};