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libcurl-errors(3)               libcurl errors               libcurl-errors(3)



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
       curl_easy_setopt(3) 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.   curl_easy_strerror(3)  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 deci-
              sion.  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_ACCEPT_FAILED (10)
              While waiting for the server to connect back when an active FTP session is used, an error code was  sent
              over the control connection or similar.

       CURLE_FTP_WEIRD_PASS_REPLY (11)
              After  having sent the FTP password to the server, libcurl expects a proper reply. This error code indi-
              cates that an unexpected code was returned.

       CURLE_FTP_ACCEPT_TIMEOUT (12)
              During an active FTP session while waiting for the server to connect,  the  CURLOPT_ACCEPTTIMOUT_MS  (or
              the internal default) timeout expired.

       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 usu-
              ally 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 problem slightly more. Could be certificates (file formats, paths,
              permissions), passwords, and others.

       CURLE_BAD_DOWNLOAD_RESUME (36)
              The download could not be resumed because the specified offset was out of the file boundary.

       CURLE_FILE_COULDNT_READ_FILE (37)
              A file given with FILE:// couldn't be opened. Most likely because the  file  path  doesn't  identify  an
              existing file. Did you check file permissions?

       CURLE_LDAP_CANNOT_BIND (38)
              LDAP cannot bind. LDAP bind operation failed.

       CURLE_LDAP_SEARCH_FAILED (39)
              LDAP search failed.

       CURLE_FUNCTION_NOT_FOUND (41)
              Function not found. A required zlib function was not found.

       CURLE_ABORTED_BY_CALLBACK (42)
              Aborted by callback. A callback returned "abort" to libcurl.

       CURLE_BAD_FUNCTION_ARGUMENT (43)
              Internal error. A function was called with a bad parameter.

       CURLE_INTERFACE_FAILED (45)
              Interface error. A specified outgoing interface could not be used. Set which interface to use for outgo-
              ing connections' source IP address with CURLOPT_INTERFACE.

       CURLE_TOO_MANY_REDIRECTS (47)
              Too many redirects. When following redirects, libcurl hit the maximum amount.  Set your limit with  CUR-
              LOPT_MAXREDIRS.

       CURLE_UNKNOWN_OPTION (48)
              An  option  passed  to  libcurl is not recognized/known. Refer to the appropriate documentation. This is
              most likely a problem in the program that uses libcurl. The error buffer  might  contain  more  specific
              information about which exact option it concerns.

       CURLE_TELNET_OPTION_SYNTAX (49)
              A telnet option string was Illegally formatted.

       CURLE_PEER_FAILED_VERIFICATION (51)
              The remote server's SSL certificate or SSH md5 fingerprint was deemed not OK.

       CURLE_GOT_NOTHING (52)
              Nothing  was  returned  from  the  server, and under the circumstances, getting nothing is considered an
              error.

       CURLE_SSL_ENGINE_NOTFOUND (53)
              The specified crypto engine wasn't found.

       CURLE_SSL_ENGINE_SETFAILED (54)
              Failed setting the selected SSL crypto engine as default!

       CURLE_SEND_ERROR (55)
              Failed sending network data.

       CURLE_RECV_ERROR (56)
              Failure with receiving network data.

       CURLE_SSL_CERTPROBLEM (58)
              problem with the local client certificate.

       CURLE_SSL_CIPHER (59)
              Couldn't use specified cipher.

       CURLE_SSL_CACERT (60)
              Peer certificate cannot be authenticated with known CA certificates.

       CURLE_BAD_CONTENT_ENCODING (61)
              Unrecognized transfer encoding.

       CURLE_LDAP_INVALID_URL (62)
              Invalid LDAP URL.

       CURLE_FILESIZE_EXCEEDED (63)
              Maximum file size exceeded.

       CURLE_USE_SSL_FAILED (64)
              Requested FTP SSL level failed.

       CURLE_SEND_FAIL_REWIND (65)
              When doing a send operation curl had to rewind the data  to  retransmit,  but  the  rewinding  operation
              failed.

       CURLE_SSL_ENGINE_INITFAILED (66)
              Initiating the SSL Engine failed.

       CURLE_LOGIN_DENIED (67)
              The remote server denied curl to login (Added in 7.13.1)

       CURLE_TFTP_NOTFOUND (68)
              File not found on TFTP server.

       CURLE_TFTP_PERM (69)
              Permission problem on TFTP server.

       CURLE_REMOTE_DISK_FULL (70)
              Out of disk space on the server.

       CURLE_TFTP_ILLEGAL (71)
              Illegal TFTP operation.

       CURLE_TFTP_UNKNOWNID (72)
              Unknown TFTP transfer ID.

       CURLE_REMOTE_FILE_EXISTS (73)
              File already exists and will not be overwritten.

       CURLE_TFTP_NOSUCHUSER (74)
              This error should never be returned by a properly functioning TFTP server.

       CURLE_CONV_FAILED (75)
              Character conversion failed.

       CURLE_CONV_REQD (76)
              Caller must register conversion callbacks.

       CURLE_SSL_CACERT_BADFILE (77)
              Problem with reading the SSL CA cert (path? access rights?)

       CURLE_REMOTE_FILE_NOT_FOUND (78)
              The resource referenced in the URL does not exist.

       CURLE_SSH (79)
              An unspecified error occurred during the SSH session.

       CURLE_SSL_SHUTDOWN_FAILED (80)
              Failed to shut down the SSL connection.

       CURLE_AGAIN (81)
              Socket  is not ready for send/recv wait till it's ready and try again. This return code is only returned
              from curl_easy_recv(3) and curl_easy_send(3) (Added in 7.18.2)

       CURLE_SSL_CRL_BADFILE (82)
              Failed to load CRL file (Added in 7.19.0)

       CURLE_SSL_ISSUER_ERROR (83)
              Issuer check failed (Added in 7.19.0)

       CURLE_FTP_PRET_FAILED (84)
              PRET command failed

       CURLE_RTSP_CSEQ_ERROR (85)
              Mismatch of RTSP CSeq numbers.

       CURLE_RTSP_SESSION_ERROR (86)
              Mismatch of RTSP Session Identifiers.

       CURLE_FTP_BAD_FILE_LIST (87)
              Unable to parse FTP file list (during FTP wildcard downloading).

       CURLE_CHUNK_FAILED (88)
              Chunk callback reported error.

       CURLE_OBSOLETE*
              These error codes will never be returned. They were used in an old libcurl  version  and  are  currently
              unused.

CURLMcode
       This is the generic return code used by functions in the libcurl multi interface. Also consider curl_multi_str-
       error(3).

       CURLM_CALL_MULTI_PERFORM (-1)
              This is not really an error. It means you should call curl_multi_perform(3) again without doing select()
              or similar in between.

       CURLM_OK (0)
              Things are fine.

       CURLM_BAD_HANDLE (1)
              The passed-in handle is not a valid CURLM handle.

       CURLM_BAD_EASY_HANDLE (2)
              An  easy  handle was not good/valid. It could mean that it isn't an easy handle at all, or possibly that
              the handle already is in used by this or another multi handle.

       CURLM_OUT_OF_MEMORY (3)
              You are doomed.

       CURLM_INTERNAL_ERROR (4)
              This can only be returned if libcurl bugs. Please report it to us!

       CURLM_BAD_SOCKET (5)
              The passed-in socket is not a valid one that libcurl already knows about.  (Added in 7.15.4)

       CURLM_UNKNOWN_OPTION (6)
              curl_multi_setopt() with unsupported option (Added in 7.15.4)

CURLSHcode
       The "share" interface will return a  CURLSHcode  to  indicate  when  an  error  has  occurred.   Also  consider
       curl_share_strerror(3).

       CURLSHE_OK (0)
              All fine. Proceed as usual.

       CURLSHE_BAD_OPTION (1)
              An invalid option was passed to the function.

       CURLSHE_IN_USE (2)
              The share object is currently in use.

       CURLSHE_INVALID (3)
              An invalid share object was passed to the function.

       CURLSHE_NOMEM (4)
              Not enough memory was available.  (Added in 7.12.0)

       CURLSHE_NOT_BUILT_IN (5)
              The  requsted  sharing  could not be done because the library you use don't have that particular feature
              enabled. (Added in 7.23.0)



libcurl 7.20.0                    1 Jan 2010                 libcurl-errors(3)