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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  prob-
       lem 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_ERROR-
       BUFFER(3)  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 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)
              The server sent data libcurl couldn't parse. This error code  is
              used    for   more   than   just   FTP   and   is   aliased   as
              CURLE_WEIRD_SERVER_REPLY since 7.51.0.

       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 connec-
              tion 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 indicates that an unex-
              pected code was returned.

       CURLE_FTP_ACCEPT_TIMEOUT (12)
              During  an  active  FTP  session while waiting for the server to
              connect,  the  CURLOPT_ACCEPTTIMEOUT_MS(3)  (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_CANT_GET_HOST (15)
              An internal failure to lookup the host used for the new  connec-
              tion.

       CURLE_HTTP2 (16)
              A problem was detected in the HTTP2 framing layer. This is some-
              what generic and can be one out of  several  problems,  see  the
              error buffer for details.

       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  hap-
              pens  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(3) 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(3).

       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 confu-
              sion.

       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  outgoing  connections'
              source IP address with CURLOPT_INTERFACE(3).

       CURLE_TOO_MANY_REDIRECTS (47)
              Too  many  redirects.  When following redirects, libcurl hit the
              maximum amount.  Set your limit with CURLOPT_MAXREDIRS(3).

       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  circum-
              stances, 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 certifi-
              cates.

       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)
              The  FTP  server  does not understand the PRET command at all or
              does not support the given argument. Be careful when using  CUR-
              LOPT_CUSTOMREQUEST(3),  a  custom LIST command will be sent with
              PRET CMD before PASV as well. (Added in 7.20.0)

       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_NO_CONNECTION_AVAILABLE (89)
              (For internal use only, will never be returned  by  libcurl)  No
              connection  available,  the  session  will  be queued. (added in
              7.30.0)

       CURLE_SSL_PINNEDPUBKEYNOTMATCH (90)
              Failed to match the pinned key specified with CURLOPT_PINNEDPUB-
              LICKEY(3).

       CURLE_SSL_INVALIDCERTSTATUS (91)
              Status returned failure when asked  with  CURLOPT_SSL_VERIFYSTA-
       TUS(3).

       CURLE_HTTP2_STREAM (92)
              Stream error in the HTTP/2 framing layer.

       CURLE_RECURSIVE_API_CALL (93)
              An API function was called from inside a callback.

       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_strerror(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.  Before  version  7.20.0  this  could  be  returned  by
              curl_multi_perform(3), but in later versions this return code is
              never used.

       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)

       CURLM_ADDED_ALREADY (7)
              An easy handle already added to a multi handle was attempted  to
              get added a second time. (Added in 7.32.1)

       CURLM_RECURSIVE_API_CALL (8)
              An API function was called from inside a callback.


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


SEE ALSO

       curl_easy_strerror(3), curl_multi_strerror(3),  curl_share_strerror(3),
       CURLOPT_ERRORBUFFER(3), CURLOPT_VERBOSE(3), CURLOPT_DEBUGFUNCTION(3)



libcurl 7.59.0                 February 10, 2018             libcurl-errors(3)

curl 7.59.0 - Generated Sat Mar 17 08:47:12 CDT 2018
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