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<p class="level0"><a name="NAME"></a><h2 class="nroffsh">NAME</h2>
<p class="level0">libcurl-errors - error codes in libcurl <a name="DESCRIPTION"></a><h2 class="nroffsh">DESCRIPTION</h2>
<p class="level0">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. <a name="CURLcode"></a><h2 class="nroffsh">CURLcode</h2>
-<p class="level0">Almost all "easy" interface functions return a CURLcode error code. No matter what, using the <a class="emphasis" href="./curl_easy_setopt.html">curl_easy_setopt(3)</a> option <span Class="emphasis">CURLOPT_ERRORBUFFER</span> 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. <a class="emphasis" href="./curl_easy_strerror.html">curl_easy_strerror(3)</a> can be called to get an error string from a given CURLcode number.
+<p class="level0">Almost all "easy" interface functions return a CURLcode error code. No matter what, using the <a Class="emphasis" href="./curl_easy_setopt.html">curl_easy_setopt</a> option <span Class="emphasis">CURLOPT_ERRORBUFFER(3)</span> 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. <a Class="emphasis" href="./curl_easy_strerror.html">curl_easy_strerror</a> can be called to get an error string from a given CURLcode number.
<p class="level0">CURLcode is one of the following:
<p class="level0"><a name="CURLEOK"></a><span class="nroffip">CURLE_OK (0)</span>
<p class="level1">All fine. Proceed as usual.
<p class="level0"><a name="CURLEUNSUPPORTEDPROTOCOL"></a><span class="nroffip">CURLE_UNSUPPORTED_PROTOCOL (1)</span>
<p class="level1">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.
<p class="level0"><a name="CURLEFAILEDINIT"></a><span class="nroffip">CURLE_FAILED_INIT (2)</span>
-<p class="level1">Very early initialization code failed. This is likely to be an internal error or problem.
+<p class="level1">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.
<p class="level0"><a name="CURLEURLMALFORMAT"></a><span class="nroffip">CURLE_URL_MALFORMAT (3)</span>
<p class="level1">The URL was not properly formatted.
+<p class="level0"><a name="CURLENOTBUILTIN"></a><span class="nroffip">CURLE_NOT_BUILT_IN (4)</span>
+<p class="level1">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.
<p class="level0"><a name="CURLECOULDNTRESOLVEPROXY"></a><span class="nroffip">CURLE_COULDNT_RESOLVE_PROXY (5)</span>
<p class="level1">Couldn't resolve proxy. The given proxy host could not be resolved.
<p class="level0"><a name="CURLECOULDNTRESOLVEHOST"></a><span class="nroffip">CURLE_COULDNT_RESOLVE_HOST (6)</span>
<p class="level1">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.
<p class="level0"><a name="CURLEREMOTEACCESSDENIED"></a><span class="nroffip">CURLE_REMOTE_ACCESS_DENIED (9)</span>
<p class="level1">We were denied access to the resource given in the URL. For FTP, this occurs while trying to change to the remote directory.
+<p class="level0"><a name="CURLEFTPACCEPTFAILED"></a><span class="nroffip">CURLE_FTP_ACCEPT_FAILED (10)</span>
+<p class="level1">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.
<p class="level0"><a name="CURLEFTPWEIRDPASSREPLY"></a><span class="nroffip">CURLE_FTP_WEIRD_PASS_REPLY (11)</span>
<p class="level1">After having sent the FTP password to the server, libcurl expects a proper reply. This error code indicates that an unexpected code was returned.
+<p class="level0"><a name="CURLEFTPACCEPTTIMEOUT"></a><span class="nroffip">CURLE_FTP_ACCEPT_TIMEOUT (12)</span>
+<p class="level1">During an active FTP session while waiting for the server to connect, the <span Class="emphasis">CURLOPT_ACCEPTTIMEOUT_MS(3)</span> (or the internal default) timeout expired.
<p class="level0"><a name="CURLEFTPWEIRDPASVREPLY"></a><span class="nroffip">CURLE_FTP_WEIRD_PASV_REPLY (13)</span>
<p class="level1">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.
<p class="level0"><a name="CURLEFTPWEIRD227FORMAT"></a><span class="nroffip">CURLE_FTP_WEIRD_227_FORMAT (14)</span>
<p class="level1">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.
-<p class="level0"><a name="CURLEFTPPRETFAILED"></a><span class="nroffip">CURLE_FTP_PRET_FAILED (84)</span>
-<p class="level1">The FTP server does not understand the PRET command at all or does not support the given argument. Be careful when using <span Class="emphasis">CURLOPT_CUSTOMREQUEST</span>, a custom LIST command will be sent with PRET CMD before PASV as well. (Added in 7.20.0)
<p class="level0"><a name="CURLEFTPCANTGETHOST"></a><span class="nroffip">CURLE_FTP_CANT_GET_HOST (15)</span>
<p class="level1">An internal failure to lookup the host used for the new connection.
+<p class="level0"><a name="CURLEHTTP2"></a><span class="nroffip">CURLE_HTTP2 (16)</span>
+<p class="level1">A problem was detected in the HTTP2 framing layer. This is somewhat generic and can be one out of several problems, see the error buffer for details.
<p class="level0"><a name="CURLEFTPCOULDNTSETTYPE"></a><span class="nroffip">CURLE_FTP_COULDNT_SET_TYPE (17)</span>
<p class="level1">Received an error when trying to set the transfer mode to binary or ASCII.
<p class="level0"><a name="CURLEPARTIALFILE"></a><span class="nroffip">CURLE_PARTIAL_FILE (18)</span>
<p class="level0"><a name="CURLEQUOTEERROR"></a><span class="nroffip">CURLE_QUOTE_ERROR (21)</span>
<p class="level1">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.
<p class="level0"><a name="CURLEHTTPRETURNEDERROR"></a><span class="nroffip">CURLE_HTTP_RETURNED_ERROR (22)</span>
-<p class="level1">This is returned if CURLOPT_FAILONERROR is set TRUE and the HTTP server returns an error code that is >= 400.
+<p class="level1">This is returned if <span Class="emphasis">CURLOPT_FAILONERROR(3)</span> is set TRUE and the HTTP server returns an error code that is >= 400.
<p class="level0"><a name="CURLEWRITEERROR"></a><span class="nroffip">CURLE_WRITE_ERROR (23)</span>
<p class="level1">An error occurred when writing received data to a local file, or an error was returned to libcurl from a write callback.
<p class="level0"><a name="CURLEUPLOADFAILED"></a><span class="nroffip">CURLE_UPLOAD_FAILED (25)</span>
<p class="level0"><a name="CURLEOPERATIONTIMEDOUT"></a><span class="nroffip">CURLE_OPERATION_TIMEDOUT (28)</span>
<p class="level1">Operation timeout. The specified time-out period was reached according to the conditions.
<p class="level0"><a name="CURLEFTPPORTFAILED"></a><span class="nroffip">CURLE_FTP_PORT_FAILED (30)</span>
-<p class="level1">The FTP PORT command returned error. This mostly happens when you haven't specified a good enough address for libcurl to use. See <span Class="emphasis">CURLOPT_FTPPORT</span>.
+<p class="level1">The FTP PORT command returned error. This mostly happens when you haven't specified a good enough address for libcurl to use. See <span Class="emphasis">CURLOPT_FTPPORT(3)</span>.
<p class="level0"><a name="CURLEFTPCOULDNTUSEREST"></a><span class="nroffip">CURLE_FTP_COULDNT_USE_REST (31)</span>
<p class="level1">The FTP REST command returned error. This should never happen if the server is sane.
<p class="level0"><a name="CURLERANGEERROR"></a><span class="nroffip">CURLE_RANGE_ERROR (33)</span>
<p class="level0"><a name="CURLEBADFUNCTIONARGUMENT"></a><span class="nroffip">CURLE_BAD_FUNCTION_ARGUMENT (43)</span>
<p class="level1">Internal error. A function was called with a bad parameter.
<p class="level0"><a name="CURLEINTERFACEFAILED"></a><span class="nroffip">CURLE_INTERFACE_FAILED (45)</span>
-<p class="level1">Interface error. A specified outgoing interface could not be used. Set which interface to use for outgoing connections' source IP address with CURLOPT_INTERFACE.
+<p class="level1">Interface error. A specified outgoing interface could not be used. Set which interface to use for outgoing connections' source IP address with <span Class="emphasis">CURLOPT_INTERFACE(3)</span>.
<p class="level0"><a name="CURLETOOMANYREDIRECTS"></a><span class="nroffip">CURLE_TOO_MANY_REDIRECTS (47)</span>
-<p class="level1">Too many redirects. When following redirects, libcurl hit the maximum amount. Set your limit with CURLOPT_MAXREDIRS.
-<p class="level0"><a name="CURLEUNKNOWNTELNETOPTION"></a><span class="nroffip">CURLE_UNKNOWN_TELNET_OPTION (48)</span>
-<p class="level1">An option set with CURLOPT_TELNETOPTIONS was not recognized/known. Refer to the appropriate documentation.
+<p class="level1">Too many redirects. When following redirects, libcurl hit the maximum amount. Set your limit with <span Class="emphasis">CURLOPT_MAXREDIRS(3)</span>.
+<p class="level0"><a name="CURLEUNKNOWNOPTION"></a><span class="nroffip">CURLE_UNKNOWN_OPTION (48)</span>
+<p class="level1">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.
<p class="level0"><a name="CURLETELNETOPTIONSYNTAX"></a><span class="nroffip">CURLE_TELNET_OPTION_SYNTAX (49)</span>
<p class="level1">A telnet option string was Illegally formatted.
<p class="level0"><a name="CURLEPEERFAILEDVERIFICATION"></a><span class="nroffip">CURLE_PEER_FAILED_VERIFICATION (51)</span>
<p class="level0"><a name="CURLESSLSHUTDOWNFAILED"></a><span class="nroffip">CURLE_SSL_SHUTDOWN_FAILED (80)</span>
<p class="level1">Failed to shut down the SSL connection.
<p class="level0"><a name="CURLEAGAIN"></a><span class="nroffip">CURLE_AGAIN (81)</span>
-<p class="level1">Socket is not ready for send/recv wait till it's ready and try again. This return code is only returned from <a class="emphasis" href="./curl_easy_recv.html">curl_easy_recv(3)</a> and <a class="emphasis" href="./curl_easy_send.html">curl_easy_send(3)</a> (Added in 7.18.2)
+<p class="level1">Socket is not ready for send/recv wait till it's ready and try again. This return code is only returned from <a Class="emphasis" href="./curl_easy_recv.html">curl_easy_recv</a> and <a Class="emphasis" href="./curl_easy_send.html">curl_easy_send</a> (Added in 7.18.2)
<p class="level0"><a name="CURLESSLCRLBADFILE"></a><span class="nroffip">CURLE_SSL_CRL_BADFILE (82)</span>
<p class="level1">Failed to load CRL file (Added in 7.19.0)
<p class="level0"><a name="CURLESSLISSUERERROR"></a><span class="nroffip">CURLE_SSL_ISSUER_ERROR (83)</span>
<p class="level1">Issuer check failed (Added in 7.19.0)
<p class="level0"><a name="CURLEFTPPRETFAILED"></a><span class="nroffip">CURLE_FTP_PRET_FAILED (84)</span>
-<p class="level1">PRET command failed
+<p class="level1">The FTP server does not understand the PRET command at all or does not support the given argument. Be careful when using <span Class="emphasis">CURLOPT_CUSTOMREQUEST(3)</span>, a custom LIST command will be sent with PRET CMD before PASV as well. (Added in 7.20.0)
<p class="level0"><a name="CURLERTSPCSEQERROR"></a><span class="nroffip">CURLE_RTSP_CSEQ_ERROR (85)</span>
<p class="level1">Mismatch of RTSP CSeq numbers.
<p class="level0"><a name="CURLERTSPSESSIONERROR"></a><span class="nroffip">CURLE_RTSP_SESSION_ERROR (86)</span>
<p class="level1">Unable to parse FTP file list (during FTP wildcard downloading).
<p class="level0"><a name="CURLECHUNKFAILED"></a><span class="nroffip">CURLE_CHUNK_FAILED (88)</span>
<p class="level1">Chunk callback reported error.
+<p class="level0"><a name="CURLENOCONNECTIONAVAILABLE"></a><span class="nroffip">CURLE_NO_CONNECTION_AVAILABLE (89)</span>
+<p class="level1">(For internal use only, will never be returned by libcurl) No connection available, the session will be queued. (added in 7.30.0)
<p class="level0"><a name="CURLEOBSOLETE"></a><span class="nroffip">CURLE_OBSOLETE*</span>
<p class="level1">These error codes will never be returned. They were used in an old libcurl version and are currently unused. <a name="CURLMcode"></a><h2 class="nroffsh">CURLMcode</h2>
-<p class="level0">This is the generic return code used by functions in the libcurl multi interface. Also consider <a class="emphasis" href="./curl_multi_strerror.html">curl_multi_strerror(3)</a>.
+<p class="level0">This is the generic return code used by functions in the libcurl multi interface. Also consider <a Class="emphasis" href="./curl_multi_strerror.html">curl_multi_strerror</a>.
<p class="level0"><a name="CURLMCALLMULTIPERFORM"></a><span class="nroffip">CURLM_CALL_MULTI_PERFORM (-1)</span>
-<p class="level1">This is not really an error. It means you should call <a class="emphasis" href="./curl_multi_perform.html">curl_multi_perform(3)</a> again without doing select() or similar in between.
+<p class="level1">This is not really an error. It means you should call <a Class="emphasis" href="./curl_multi_perform.html">curl_multi_perform</a> again without doing select() or similar in between. Before version 7.20.0 this could be returned by <a Class="emphasis" href="./curl_multi_perform.html">curl_multi_perform</a>, but in later versions this return code is never used.
<p class="level0"><a name="CURLMOK"></a><span class="nroffip">CURLM_OK (0)</span>
<p class="level1">Things are fine.
<p class="level0"><a name="CURLMBADHANDLE"></a><span class="nroffip">CURLM_BAD_HANDLE (1)</span>
<p class="level0"><a name="CURLMBADSOCKET"></a><span class="nroffip">CURLM_BAD_SOCKET (5)</span>
<p class="level1">The passed-in socket is not a valid one that libcurl already knows about. (Added in 7.15.4)
<p class="level0"><a name="CURLMUNKNOWNOPTION"></a><span class="nroffip">CURLM_UNKNOWN_OPTION (6)</span>
-<p class="level1">curl_multi_setopt() with unsupported option (Added in 7.15.4) <a name="CURLSHcode"></a><h2 class="nroffsh">CURLSHcode</h2>
-<p class="level0">The "share" interface will return a CURLSHcode to indicate when an error has occurred. Also consider <a class="emphasis" href="./curl_share_strerror.html">curl_share_strerror(3)</a>.
+<p class="level1">curl_multi_setopt() with unsupported option (Added in 7.15.4)
+<p class="level0"><a name="CURLMADDEDALREADY"></a><span class="nroffip">CURLM_ADDED_ALREADY (7)</span>
+<p class="level1">An easy handle already added to a multi handle was attempted to get added a second time. (Added in 7.32.1) <a name="CURLSHcode"></a><h2 class="nroffsh">CURLSHcode</h2>
+<p class="level0">The "share" interface will return a CURLSHcode to indicate when an error has occurred. Also consider <a Class="emphasis" href="./curl_share_strerror.html">curl_share_strerror</a>.
<p class="level0"><a name="CURLSHEOK"></a><span class="nroffip">CURLSHE_OK (0)</span>
<p class="level1">All fine. Proceed as usual.
<p class="level0"><a name="CURLSHEBADOPTION"></a><span class="nroffip">CURLSHE_BAD_OPTION (1)</span>
<p class="level0"><a name="CURLSHEINVALID"></a><span class="nroffip">CURLSHE_INVALID (3)</span>
<p class="level1">An invalid share object was passed to the function.
<p class="level0"><a name="CURLSHENOMEM"></a><span class="nroffip">CURLSHE_NOMEM (4)</span>
-<p class="level1">Not enough memory was available. (Added in 7.12.0) <p class="roffit">
+<p class="level1">Not enough memory was available. (Added in 7.12.0)
+<p class="level0"><a name="CURLSHENOTBUILTIN"></a><span class="nroffip">CURLSHE_NOT_BUILT_IN (5)</span>
+<p class="level1">The requested sharing could not be done because the library you use don't have that particular feature enabled. (Added in 7.23.0) <a name="SEE"></a><h2 class="nroffsh">SEE ALSO</h2>
+<p class="level0"><a Class="manpage" href="./curl_easy_strerror.html">curl_easy_strerror</a>, <a Class="manpage" href="./curl_multi_strerror.html">curl_multi_strerror</a>, <span Class="manpage"> </span> <a Class="manpage" href="./curl_share_strerror.html">curl_share_strerror</a>, <span Class="manpage"> CURLOPT_ERRORBUFFER (3)</span> <span Class="manpage"> </span> <span Class="manpage">CURLOPT_VERBOSE (3)</span> <span Class="manpage"> CURLOPT_DEBUGFUNCTION (3) </span> <p class="roffit">
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