【iOS开发】HTTP请求错误码 ？ CodeType

NS_ENUM(NSInteger)
{
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,
NSURLErrorAppTransportSecurityRequiresSecureConnection NS_ENUM_AVAILABLE(10_11, 9_0) = -1022,
NSURLErrorFileDoesNotExist =        -1100,
NSURLErrorFileIsDirectory =        -1101,
NSURLErrorNoPermissionsToReadFile =    -1102,
NSURLErrorDataLengthExceedsMaximum NS_ENUM_AVAILABLE(10_5, 2_0) =  -1103,

// 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,

NSURLErrorInternationalRoamingOff NS_ENUM_AVAILABLE(10_7, 3_0) =        -1018,
NSURLErrorCallIsActive NS_ENUM_AVAILABLE(10_7, 3_0) =                    -1019,
NSURLErrorDataNotAllowed NS_ENUM_AVAILABLE(10_7, 3_0) =                  -1020,
NSURLErrorRequestBodyStreamExhausted NS_ENUM_AVAILABLE(10_7, 3_0) =      -1021,

NSURLErrorBackgroundSessionRequiresSharedContainer NS_ENUM_AVAILABLE(10_10, 8_0) = -995,
NSURLErrorBackgroundSessionInUseByAnotherProcess NS_ENUM_AVAILABLE(10_10, 8_0) = -996,
NSURLErrorBackgroundSessionWasDisconnected NS_ENUM_AVAILABLE(10_10, 8_0)= -997,
};