<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="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_ACCEPTTIMOUT_MS</span> (or the internal default) timeout expired.
+<p class="level1">During an active FTP session while waiting for the server to connect, the <span Class="emphasis">CURLOPT_ACCEPTTIMOUT_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="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="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="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">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="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">(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. Before version 7.20.0 this could be returned by <a class="emphasis" href="./curl_multi_perform.html">curl_multi_perform(3)</a>, but in later versions this return code is never used.
+<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="CURLSHENOMEM"></a><span class="nroffip">CURLSHE_NOMEM (4)</span>
<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) <p class="roffit">
+<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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