CFNetwork的错误代码参考

 所有的错误代码是在对“CFNetwork的错误代码参考” 小提取CFURL和CFURLConnection错误：

 kCFURLErrorUnknown = -998,
 kCFURLErrorCancelled = -999,
 kCFURLErrorBadURL = -1000,
 kCFURLErrorTimedOut = -1001,
 kCFURLErrorUnsupportedURL = -1002,
 kCFURLErrorCannotFindHost = -1003,
 kCFURLErrorCannotConnectToHost = -1004,
 kCFURLErrorNetworkConnectionLost = -1005,
 kCFURLErrorDNSLookupFailed  = -1006,
 kCFURLErrorHTTPTooManyRedirects = -1007,
 kCFURLErrorResourceUnavailable = -1008,
 kCFURLErrorNotConnectedToInternet = -1009,
 kCFURLErrorRedirectToNonExistentLocation = -1010,
 kCFURLErrorBadServerResponse    = -1011,
 kCFURLErrorUserCancelledAuthentication = -1012,
 kCFURLErrorUserAuthenticationRequired = -1013,
 kCFURLErrorZeroByteResource  = -1014,
 kCFURLErrorCannotDecodeRawData  = -1015,
 kCFURLErrorCannotDecodeContentData = -1016,
 kCFURLErrorCannotParseResponse  = -1017,
 kCFURLErrorInternationalRoamingOff = -1018,
 kCFURLErrorCallIsActive    = -1019,
 kCFURLErrorDataNotAllowed    = -1020,
 kCFURLErrorRequestBodyStreamExhausted = -1021,
 kCFURLErrorFileDoesNotExist   = -1100,
 kCFURLErrorFileIsDirectory   = -1101,
 kCFURLErrorNoPermissionsToReadFile = -1102,
 kCFURLErrorDataLengthExceedsMaximum = -1103,