List of CURL status codes (details)

This article provides a detailed analysis of the CURL status code list. For more information, see

CURL status code list
Status Code	Status reason	Explanation
0	Normal access
1	Incorrect protocol	Unsupported protocol. This version of cURL does not support this protocol.
2	Initialization code failed	Initialization failed.
3	The URL format is incorrect.	URL format error. Incorrect syntax.
4	Request protocol error
5	Unable to parse proxy	The proxy cannot be resolved. The specified proxy Host cannot be parsed.
6	Unable to resolve host address	The host cannot be parsed. The specified remote host cannot be parsed.
7	Unable to connect to host	Unable to connect to the host.
8	Remote server unavailable	An abnormal FTP server responds. CURL cannot parse the data sent by the server.
9	Resource Access error	FTP access is denied. The server refuses to log on or cannot obtain the desired resource or directory. Most available You can try to enter a directory that does not exist on this server.
11	Incorrect FTP password	FTP abnormal PASS reply. CURL cannot parse the response sent to the PASS request.
13	Incorrect result	If FTP does not respond to an abnormal PASV, cURL cannot parse the response sent to the PASV request.
14	FTP responds to the PASV command	The FTP format is 227. CURL cannot resolve the 227 rows sent by the server.
15	Internal fault	FTP cannot connect to the host. The host IP address obtained in row 3 cannot be parsed.
17	Set the transmission mode to binary	FTP cannot be set to binary transmission. You cannot change the transmission mode to binary.
18	The file transfer is short or later than expected	Some files. Only some files are transmitted.
19	RETR command transmission completed	The RETR (or similar) command fails when FTP cannot download/access the specified file.
21	Command completed successfully	FTP quote error. Quote command returns an error from the server.
22	Return normal	The webpage cannot be found in HTTP. The requested URL cannot be found or another HTTP 400 or later error is returned. The returned code only appears after the-f/-- fail option is used.
23	Data writing failed	Write error. CURL cannot write data to a local file system or for similar purposes.
25	Unable to Start Upload	FTP cannot STOR files. The server rejects the STOR operation for FTP upload.
26	Callback error	Read error. Read problems.
27	Memory allocation request failed	Insufficient memory. Memory allocation request failed.
28	Access timeout	Operation timeout. The specified timeout period is reached.
30	FTP port error	Ftp port failure. PORT command failed. Not all FTP servers support PORT commands. please Try to use passive (PASV) transmission instead!
31	FTP error	FTP cannot use the REST command. The REST command fails. This command is used to recover FTP transfers.
33	Request not supported	HTTP range error. The range "command" does not work.
34	Internal error	Http post error. Internal POST request error.
35	SSL/TLS handshake failed	SSL connection error. SSL Handshake failed.
36	Download cannot be recovered	FTP resume is damaged. You cannot continue the download that was aborted earlier.
37	File permission error	The file cannot be read. The file cannot be opened. Permission problems?
38	LDAP is not binding.	LDAP cannot be bound. The LDAP binding (bind) operation failed.
39	LDAP Search failed	LDAP search failed.
41	Function not found	Function cannot be found. You cannot find the required LDAP functions.
42	Aborted callback	Terminated by callback. The application notifies cURL of terminating the operation.
43	Internal error	Internal error. The function is called by an incorrect parameter.
45	Interface error	Interface error. The specified outbound interface is unavailable.
47	Excessive redirection	Excessive redirection. CURL has reached the maximum limit set by following redirection
48	Unrecognized option	The unknown TELNET Option is specified.
49	TELNET format error	Invalid telnet Options.
51	SSL certificate for remote servers	The peer's SSL certificate or the MD5 fingerprint of SSH are not determined.
52	No content returned by the server	The server does not receive any response, which is considered an error here.
53	Encryption Engine not found	The SSL encryption engine cannot be found.
54	Failed to set default SSL encryption	The SSL encryption engine cannot be set to the default value.
55	Unable to send network data	Failed to send network data.
56	Failure to receive network data	Failed to receive network data.
57
58	Local client certificate	There is a problem with the local certificate.
59	Password unavailable	The specified SSL password cannot be used.
60	The credential cannot be verified.	Peer certificates cannot be verified by known CA certificates.
61	Unrecognized transfer encoding	Unrecognized transfer encoding.
62	Invalid LDAP URL	Invalid ldap url.
63	The maximum file size is exceeded.	Exceeds the maximum file size.
64	FTP failed	The required ftp ssl level fails.
65	An error occurred while performing the rewind operation.	The volume (rewind) required to send this data failed.
66	SSL engine failure	An error occurred while initializing the SSL engine.
67	Login denied on the server	The user name, password, or similar information is not accepted, and cURL logon fails.
68	File Not Found	The file cannot be found on the TFTP server.
69	No permission	The TFTP server permission is incorrect.
70	Exceeds server disk space	The disk space of the TFTP server is insufficient.
71	Illegal TFTP operation	Illegal TFTP operation.
72	Unknown TFTP transfer ID	Unknown TFTP transfer number (ID ).
73	File already exists	The file already exists (TFTP ).
74	Error TFTP server	This user does not exist (TFTP ).
75	Character conversion failed	Character conversion failed.
76	Callback must be recorded	Character conversion is required.
77	CA certificate permission	An error occurred while reading the SSL certificate (path? Access permission? ).
78	The referenced resource in the URL does not exist.	The referenced resource in the URL does not exist.
79	The error occurs in the SSH session.	An unknown error occurs during an SSH session.
80	Unable to close SSL connection	Failed to close the SSL connection.
81	Service not prepared
82	Cannot load CRL file	Cannot load CRL files, lost or incorrectly formatted (added in version 7.19.0 ).
83	Issuer check failed	Issue check failed (added in version 7.19.0 ).