iOS 网络请求（AFNetworking）失败的错误码分析

NSError codes in the Cocoa error domain.

enum {
   NSFileNoSuchFileError = 4,
   NSFileLockingError = 255,
   NSFileReadUnknownError = 256,
   NSFileReadNoPermissionError = 257,
   NSFileReadInvalidFileNameError = 258,
   NSFileReadCorruptFileError = 259,
   NSFileReadNoSuchFileError = 260,
   NSFileReadInapplicableStringEncodingError = 261,
   NSFileReadUnsupportedSchemeError = 262,
   NSFileReadTooLargeError = 263,
   NSFileReadUnknownStringEncodingError = 264,
   NSFileWriteUnknownError = 512,
   NSFileWriteNoPermissionError = 513,
   NSFileWriteInvalidFileNameError = 514,
   NSFileWriteInapplicableStringEncodingError = 517,
   NSFileWriteUnsupportedSchemeError = 518,
   NSFileWriteOutOfSpaceError = 640,
   NSFileWriteVolumeReadOnlyError = 642m
   NSKeyValueValidationError = 1024,
   NSFormattingError = 2048,
   NSUserCancelledError = 3072,
   
   NSFileErrorMinimum = 0,
   NSFileErrorMaximum = 1023,
   NSValidationErrorMinimum = 1024,
   NSValidationErrorMaximum = 2047,
   NSFormattingErrorMinimum = 2048,
   NSFormattingErrorMaximum = 2559,
   
   NSPropertyListReadCorruptError = 3840,
   NSPropertyListReadUnknownVersionError = 3841,
   NSPropertyListReadStreamError = 3842,
   NSPropertyListWriteStreamError = 3851,
   NSPropertyListErrorMinimum = 3840,
   NSPropertyListErrorMaximum = 4095
   
   NSExecutableErrorMinimum = 3584,
   NSExecutableNotLoadableError = 3584,
   NSExecutableArchitectureMismatchError = 3585,
   NSExecutableRuntimeMismatchError = 3586,
   NSExecutableLoadError = 3587,
   NSExecutableLinkError = 3588,
   NSExecutableErrorMaximum = 3839,
   
}

URL Loading System Error Codes

These values are returned as the error code property of an NSError object with the domain “NSURLErrorDomain”.

typedef enum
{
   NSURLErrorUnknown = -1,
   NSURLErrorCancelled = -999,
   NSURLErrorBadURL = -1000,
   NSURLErrorTimedOut = -1001,
   NSURLErrorUnsupportedURL = -1002,
   NSURLErrorCannotFindHost = -1003,
   NSURLErrorCannotConnectToHost = -1004,
   NSURLErrorDataLengthExceedsMaximum = -1103,
   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,
   NSURLErrorFileDoesNotExist = -1100,
   NSURLErrorFileIsDirectory = -1101,
   NSURLErrorNoPermissionsToReadFile = -1102,
   NSURLErrorSecureConnectionFailed = -1200,
   NSURLErrorServerCertificateHasBadDate = -1201,
   NSURLErrorServerCertificateUntrusted = -1202,
   NSURLErrorServerCertificateHasUnknownRoot = -1203,
   NSURLErrorServerCertificateNotYetValid = -1204,
   NSURLErrorClientCertificateRejected = -1205,
   NSURLErrorClientCertificateRequired = -1206,
   NSURLErrorCannotLoadFromNetwork = -2000,
   NSURLErrorCannotCreateFile = -3000,
   NSURLErrorCannotOpenFile = -3001,
   NSURLErrorCannotCloseFile = -3002,
   NSURLErrorCannotWriteToFile = -3003,
   NSURLErrorCannotRemoveFile = -3004,
   NSURLErrorCannotMoveFile = -3005,
   NSURLErrorDownloadDecodingFailedMidStream = -3006,
   NSURLErrorDownloadDecodingFailedToComplete = -3007
}