2024年4月15日发(作者：)

CURL错误代码及含义

NAME

libcurl-errors - error codes in libcurl

DESCRIPTION

This man page includes most, if not all, available error codes in libcurl. Why they occur and possibly what you can do to fix the problem are

also included.

CURLcode

Almost all "easy" interface functions return a CURLcode error code. No matter what, using the option CURLOPT_ERRORBUFFER is a

good idea as it will give you a human readable error string that may offer more details about the cause of the error than just the error

code. can be called to get an error string from a given CURLcode number.

CURLcode is one of the following:

CURLE_OK (0)

All fine. Proceed as usual.

CURLE_UNSUPPORTED_PROTOCOL (1)

The URL you passed to libcurl used a protocol that this libcurl does not support. The support might be a compile-time option that you didn't

use, it can be a misspelled protocol string or just a protocol libcurl has no code for.

CURLE_FAILED_INIT (2)

Very early initialization code failed. This is likely to be an internal error or problem, or a resource problem where something fundamental

couldn't get done at init time.

CURLE_URL_MALFORMAT (3)

The URL was not properly formatted.

CURLE_NOT_BUILT_IN (4)

A requested feature, protocol or option was not found built-in in this libcurl due to a build-time decision. This means that a feature or option

was not enabled or explicitly disabled when libcurl was built and in order to get it to function you have to get a rebuilt libcurl.

CURLE_COULDNT_RESOLVE_PROXY (5)

Couldn't resolve proxy. The given proxy host could not be resolved.

CURLE_COULDNT_RESOLVE_HOST (6)

Couldn't resolve host. The given remote host was not resolved.

CURLE_COULDNT_CONNECT (7)

Failed to connect() to host or proxy.

CURLE_FTP_WEIRD_SERVER_REPLY (8)

After connecting to a FTP server, libcurl expects to get a certain reply back. This error code implies that it got a strange or bad reply. The

given remote server is probably not an OK FTP server.

CURLE_REMOTE_ACCESS_DENIED (9)

We were denied access to the resource given in the URL. For FTP, this occurs while trying to change to the remote directory.

CURLE_FTP_WEIRD_PASS_REPLY (11)

After having sent the FTP password to the server, libcurl expects a proper reply. This error code indicates that an unexpected code was

returned.

CURLE_FTP_WEIRD_PASV_REPLY (13)

libcurl failed to get a sensible result back from the server as a response to either a PASV or a EPSV command. The server is flawed.

CURLE_FTP_WEIRD_227_FORMAT (14)

FTP servers return a 227-line as a response to a PASV command. If libcurl fails to parse that line, this return code is passed back.

CURLE_FTP_PRET_FAILED (84)

The FTP server does not understand the PRET command at all or does not support the given argument. Be careful when

using CURLOPT_CUSTOMREQUEST, a custom LIST command will be sent with PRET CMD before PASV as well. (Added in 7.20.0)

CURLE_FTP_CANT_GET_HOST (15)

An internal failure to lookup the host used for the new connection.

CURLE_FTP_COULDNT_SET_TYPE (17)

Received an error when trying to set the transfer mode to binary or ASCII.

CURLE_PARTIAL_FILE (18)

A file transfer was shorter or larger than expected. This happens when the server first reports an expected transfer size, and then delivers

data that doesn't match the previously given size.

CURLE_FTP_COULDNT_RETR_FILE (19)

This was either a weird reply to a 'RETR' command or a zero byte transfer complete.

CURLE_QUOTE_ERROR (21)

When sending custom "QUOTE" commands to the remote server, one of the commands returned an error code that was 400 or higher (for

FTP) or otherwise indicated unsuccessful completion of the command.

CURLE_HTTP_RETURNED_ERROR (22)

This is returned if CURLOPT_FAILONERROR is set TRUE and the HTTP server returns an error code that is >= 400.

CURLE_WRITE_ERROR (23)

An error occurred when writing received data to a local file, or an error was returned to libcurl from a write callback.

CURLE_UPLOAD_FAILED (25)

Failed starting the upload. For FTP, the server typically denied the STOR command. The error buffer usually contains the server's

explanation for this.

CURLE_READ_ERROR (26)

There was a problem reading a local file or an error returned by the read callback.

CURLE_OUT_OF_MEMORY (27)

A memory allocation request failed. This is serious badness and things are severely screwed up if this ever occurs.

CURLE_OPERATION_TIMEDOUT (28)

Operation timeout. The specified time-out period was reached according to the conditions.

CURLE_FTP_PORT_FAILED (30)

The FTP PORT command returned error. This mostly happens when you haven't specified a good enough address for libcurl to use.

See CURLOPT_FTPPORT.

CURLE_FTP_COULDNT_USE_REST (31)

The FTP REST command returned error. This should never happen if the server is sane.

CURLE_RANGE_ERROR (33)

The server does not support or accept range requests.

CURLE_HTTP_POST_ERROR (34)

This is an odd error that mainly occurs due to internal confusion.

CURLE_SSL_CONNECT_ERROR (35)

A problem occurred somewhere in the SSL/TLS handshake. You really want the error buffer and read the message there as it pinpoints the