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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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23 .TH libcurl-errors 3 "1 Jan 2010" "libcurl 7.20.0" "libcurl errors"
24 .SH NAME
25 libcurl-errors \- error codes in libcurl
26 .SH DESCRIPTION
27 This man page includes most, if not all, available error codes in libcurl.
28 Why they occur and possibly what you can do to fix the problem are also included.
29 .SH "CURLcode"
30 Almost all "easy" interface functions return a CURLcode error code. No matter
31 what, using the \fIcurl_easy_setopt(3)\fP option \fICURLOPT_ERRORBUFFER(3)\fP
32 is a good idea as it will give you a human readable error string that may
33 offer more details about the cause of the error than just the error code.
34 \fIcurl_easy_strerror(3)\fP can be called to get an error string from a given
35 CURLcode number.
36
37 CURLcode is one of the following:
38 .IP "CURLE_OK (0)"
39 All fine. Proceed as usual.
40 .IP "CURLE_UNSUPPORTED_PROTOCOL (1)"
41 The URL you passed to libcurl used a protocol that this libcurl does not
42 support. The support might be a compile-time option that you didn't use, it
43 can be a misspelled protocol string or just a protocol libcurl has no code
44 for.
45 .IP "CURLE_FAILED_INIT (2)"
46 Very early initialization code failed. This is likely to be an internal error
47 or problem, or a resource problem where something fundamental couldn't get
48 done at init time.
49 .IP "CURLE_URL_MALFORMAT (3)"
50 The URL was not properly formatted.
51 .IP "CURLE_NOT_BUILT_IN (4)"
52 A requested feature, protocol or option was not found built-in in this libcurl
53 due to a build-time decision. This means that a feature or option was not
54 enabled or explicitly disabled when libcurl was built and in order to get it
55 to function you have to get a rebuilt libcurl.
56 .IP "CURLE_COULDNT_RESOLVE_PROXY (5)"
57 Couldn't resolve proxy. The given proxy host could not be resolved.
58 .IP "CURLE_COULDNT_RESOLVE_HOST (6)"
59 Couldn't resolve host. The given remote host was not resolved.
60 .IP "CURLE_COULDNT_CONNECT (7)"
61 Failed to connect() to host or proxy.
62 .IP "CURLE_FTP_WEIRD_SERVER_REPLY (8)"
63 The server sent data libcurl couldn't parse. This error code is used for more
64 than just FTP and is aliased as \fICURLE_WEIRD_SERVER_REPLY\fP since 7.51.0.
65 .IP "CURLE_REMOTE_ACCESS_DENIED (9)"
66 We were denied access to the resource given in the URL. For FTP, this occurs
67 while trying to change to the remote directory.
68 .IP "CURLE_FTP_ACCEPT_FAILED (10)"
69 While waiting for the server to connect back when an active FTP session is
70 used, an error code was sent over the control connection or similar.
71 .IP "CURLE_FTP_WEIRD_PASS_REPLY (11)"
72 After having sent the FTP password to the server, libcurl expects a proper
73 reply. This error code indicates that an unexpected code was returned.
74 .IP "CURLE_FTP_ACCEPT_TIMEOUT (12)"
75 During an active FTP session while waiting for the server to connect, the
76 \fICURLOPT_ACCEPTTIMEOUT_MS(3)\fP (or the internal default) timeout expired.
77 .IP "CURLE_FTP_WEIRD_PASV_REPLY (13)"
78 libcurl failed to get a sensible result back from the server as a response to
79 either a PASV or a EPSV command. The server is flawed.
80 .IP "CURLE_FTP_WEIRD_227_FORMAT (14)"
81 FTP servers return a 227-line as a response to a PASV command. If libcurl
82 fails to parse that line, this return code is passed back.
83 .IP "CURLE_FTP_CANT_GET_HOST (15)"
84 An internal failure to lookup the host used for the new connection.
85 .IP "CURLE_HTTP2 (16)"
86 A problem was detected in the HTTP2 framing layer. This is somewhat generic
87 and can be one out of several problems, see the error buffer for details.
88 .IP "CURLE_FTP_COULDNT_SET_TYPE (17)"
89 Received an error when trying to set the transfer mode to binary or ASCII.
90 .IP "CURLE_PARTIAL_FILE (18)"
91 A file transfer was shorter or larger than expected. This happens when the
92 server first reports an expected transfer size, and then delivers data that
93 doesn't match the previously given size.
94 .IP "CURLE_FTP_COULDNT_RETR_FILE (19)"
95 This was either a weird reply to a 'RETR' command or a zero byte transfer
96 complete.
97 .IP "CURLE_QUOTE_ERROR (21)"
98 When sending custom "QUOTE" commands to the remote server, one of the commands
99 returned an error code that was 400 or higher (for FTP) or otherwise
100 indicated unsuccessful completion of the command.
101 .IP "CURLE_HTTP_RETURNED_ERROR (22)"
102 This is returned if \fICURLOPT_FAILONERROR(3)\fP is set TRUE and the HTTP
103 server returns an error code that is >= 400.
104 .IP "CURLE_WRITE_ERROR (23)"
105 An error occurred when writing received data to a local file, or an error was
106 returned to libcurl from a write callback.
107 .IP "CURLE_UPLOAD_FAILED (25)"
108 Failed starting the upload. For FTP, the server typically denied the STOR
109 command. The error buffer usually contains the server's explanation for this.
110 .IP "CURLE_READ_ERROR (26)"
111 There was a problem reading a local file or an error returned by the read
112 callback.
113 .IP "CURLE_OUT_OF_MEMORY (27)"
114 A memory allocation request failed. This is serious badness and
115 things are severely screwed up if this ever occurs.
116 .IP "CURLE_OPERATION_TIMEDOUT (28)"
117 Operation timeout. The specified time-out period was reached according to the
118 conditions.
119 .IP "CURLE_FTP_PORT_FAILED (30)"
120 The FTP PORT command returned error. This mostly happens when you haven't
121 specified a good enough address for libcurl to use. See
122 \fICURLOPT_FTPPORT(3)\fP.
123 .IP "CURLE_FTP_COULDNT_USE_REST (31)"
124 The FTP REST command returned error. This should never happen if the server is
125 sane.
126 .IP "CURLE_RANGE_ERROR (33)"
127 The server does not support or accept range requests.
128 .IP "CURLE_HTTP_POST_ERROR (34)"
129 This is an odd error that mainly occurs due to internal confusion.
130 .IP "CURLE_SSL_CONNECT_ERROR (35)"
131 A problem occurred somewhere in the SSL/TLS handshake. You really want the
132 error buffer and read the message there as it pinpoints the problem slightly
133 more. Could be certificates (file formats, paths, permissions), passwords, and
134 others.
135 .IP "CURLE_BAD_DOWNLOAD_RESUME (36)"
136 The download could not be resumed because the specified offset was out of the
137 file boundary.
138 .IP "CURLE_FILE_COULDNT_READ_FILE (37)"
139 A file given with FILE:// couldn't be opened. Most likely because the file
140 path doesn't identify an existing file. Did you check file permissions?
141 .IP "CURLE_LDAP_CANNOT_BIND (38)"
142 LDAP cannot bind. LDAP bind operation failed.
143 .IP "CURLE_LDAP_SEARCH_FAILED (39)"
144 LDAP search failed.
145 .IP "CURLE_FUNCTION_NOT_FOUND (41)"
146 Function not found. A required zlib function was not found.
147 .IP "CURLE_ABORTED_BY_CALLBACK (42)"
148 Aborted by callback. A callback returned "abort" to libcurl.
149 .IP "CURLE_BAD_FUNCTION_ARGUMENT (43)"
150 Internal error. A function was called with a bad parameter.
151 .IP "CURLE_INTERFACE_FAILED (45)"
152 Interface error. A specified outgoing interface could not be used. Set which
153 interface to use for outgoing connections' source IP address with
154 \fICURLOPT_INTERFACE(3)\fP.
155 .IP "CURLE_TOO_MANY_REDIRECTS (47)"
156 Too many redirects. When following redirects, libcurl hit the maximum amount.
157 Set your limit with \fICURLOPT_MAXREDIRS(3)\fP.
158 .IP "CURLE_UNKNOWN_OPTION (48)"
159 An option passed to libcurl is not recognized/known. Refer to the appropriate
160 documentation. This is most likely a problem in the program that uses
161 libcurl. The error buffer might contain more specific information about which
162 exact option it concerns.
163 .IP "CURLE_TELNET_OPTION_SYNTAX (49)"
164 A telnet option string was Illegally formatted.
165 .IP "CURLE_GOT_NOTHING (52)"
166 Nothing was returned from the server, and under the circumstances, getting
167 nothing is considered an error.
168 .IP "CURLE_SSL_ENGINE_NOTFOUND (53)"
169 The specified crypto engine wasn't found.
170 .IP "CURLE_SSL_ENGINE_SETFAILED (54)"
171 Failed setting the selected SSL crypto engine as default!
172 .IP "CURLE_SEND_ERROR (55)"
173 Failed sending network data.
174 .IP "CURLE_RECV_ERROR (56)"
175 Failure with receiving network data.
176 .IP "CURLE_SSL_CERTPROBLEM (58)"
177 problem with the local client certificate.
178 .IP "CURLE_SSL_CIPHER (59)"
179 Couldn't use specified cipher.
180 .IP "CURLE_PEER_FAILED_VERIFICATION (60)"
181 The remote server's SSL certificate or SSH md5 fingerprint was deemed not OK.
182 This error code has been unified with CURLE_SSL_CACERT since 7.62.0. Its
183 previous value was 51.
184 .IP "CURLE_BAD_CONTENT_ENCODING (61)"
185 Unrecognized transfer encoding.
186 .IP "CURLE_LDAP_INVALID_URL (62)"
187 Invalid LDAP URL.
188 .IP "CURLE_FILESIZE_EXCEEDED (63)"
189 Maximum file size exceeded.
190 .IP "CURLE_USE_SSL_FAILED (64)"
191 Requested FTP SSL level failed.
192 .IP "CURLE_SEND_FAIL_REWIND (65)"
193 When doing a send operation curl had to rewind the data to retransmit, but the
194 rewinding operation failed.
195 .IP "CURLE_SSL_ENGINE_INITFAILED (66)"
196 Initiating the SSL Engine failed.
197 .IP "CURLE_LOGIN_DENIED (67)"
198 The remote server denied curl to login (Added in 7.13.1)
199 .IP "CURLE_TFTP_NOTFOUND (68)"
200 File not found on TFTP server.
201 .IP "CURLE_TFTP_PERM (69)"
202 Permission problem on TFTP server.
203 .IP "CURLE_REMOTE_DISK_FULL (70)"
204 Out of disk space on the server.
205 .IP "CURLE_TFTP_ILLEGAL (71)"
206 Illegal TFTP operation.
207 .IP "CURLE_TFTP_UNKNOWNID (72)"
208 Unknown TFTP transfer ID.
209 .IP "CURLE_REMOTE_FILE_EXISTS (73)"
210 File already exists and will not be overwritten.
211 .IP "CURLE_TFTP_NOSUCHUSER (74)"
212 This error should never be returned by a properly functioning TFTP server.
213 .IP "CURLE_CONV_FAILED (75)"
214 Character conversion failed.
215 .IP "CURLE_CONV_REQD (76)"
216 Caller must register conversion callbacks.
217 .IP "CURLE_SSL_CACERT_BADFILE (77)"
218 Problem with reading the SSL CA cert (path? access rights?)
219 .IP "CURLE_REMOTE_FILE_NOT_FOUND (78)"
220 The resource referenced in the URL does not exist.
221 .IP "CURLE_SSH (79)"
222 An unspecified error occurred during the SSH session.
223 .IP "CURLE_SSL_SHUTDOWN_FAILED (80)"
224 Failed to shut down the SSL connection.
225 .IP "CURLE_AGAIN (81)"
226 Socket is not ready for send/recv wait till it's ready and try again. This
227 return code is only returned from \fIcurl_easy_recv(3)\fP and
228 \fIcurl_easy_send(3)\fP (Added in 7.18.2)
229 .IP "CURLE_SSL_CRL_BADFILE (82)"
230 Failed to load CRL file (Added in 7.19.0)
231 .IP "CURLE_SSL_ISSUER_ERROR (83)"
232 Issuer check failed (Added in 7.19.0)
233 .IP "CURLE_FTP_PRET_FAILED (84)"
234 The FTP server does not understand the PRET command at all or does not support
235 the given argument. Be careful when using \fICURLOPT_CUSTOMREQUEST(3)\fP, a
236 custom LIST command will be sent with PRET CMD before PASV as well. (Added in
237 7.20.0)
238 .IP "CURLE_RTSP_CSEQ_ERROR (85)"
239 Mismatch of RTSP CSeq numbers.
240 .IP "CURLE_RTSP_SESSION_ERROR (86)"
241 Mismatch of RTSP Session Identifiers.
242 .IP "CURLE_FTP_BAD_FILE_LIST (87)"
243 Unable to parse FTP file list (during FTP wildcard downloading).
244 .IP "CURLE_CHUNK_FAILED (88)"
245 Chunk callback reported error.
246 .IP "CURLE_NO_CONNECTION_AVAILABLE (89)"
247 (For internal use only, will never be returned by libcurl) No connection
248 available, the session will be queued. (added in 7.30.0)
249 .IP "CURLE_SSL_PINNEDPUBKEYNOTMATCH (90)"
250 Failed to match the pinned key specified with \fICURLOPT_PINNEDPUBLICKEY(3)\fP.
251 .IP "CURLE_SSL_INVALIDCERTSTATUS (91)"
252 Status returned failure when asked with \fICURLOPT_SSL_VERIFYSTATUS(3)\fP.
253 .IP "CURLE_HTTP2_STREAM (92)"
254 Stream error in the HTTP/2 framing layer.
255 .IP "CURLE_RECURSIVE_API_CALL (93)"
256 An API function was called from inside a callback.
257 .IP "CURLE_AUTH_ERROR (94)"
258 An authentication function returned an error.
259 .IP "CURLE_OBSOLETE*"
260 These error codes will never be returned. They were used in an old libcurl
261 version and are currently unused.
262 .SH "CURLMcode"
263 This is the generic return code used by functions in the libcurl multi
264 interface. Also consider \fIcurl_multi_strerror(3)\fP.
265 .IP "CURLM_CALL_MULTI_PERFORM (-1)"
266 This is not really an error. It means you should call
267 \fIcurl_multi_perform(3)\fP again without doing select() or similar in
268 between. Before version 7.20.0 this could be returned by
269 \fIcurl_multi_perform(3)\fP, but in later versions this return code is never
270 used.
271 .IP "CURLM_OK (0)"
272 Things are fine.
273 .IP "CURLM_BAD_HANDLE (1)"
274 The passed-in handle is not a valid CURLM handle.
275 .IP "CURLM_BAD_EASY_HANDLE (2)"
276 An easy handle was not good/valid. It could mean that it isn't an easy handle
277 at all, or possibly that the handle already is in used by this or another
278 multi handle.
279 .IP "CURLM_OUT_OF_MEMORY (3)"
280 You are doomed.
281 .IP "CURLM_INTERNAL_ERROR (4)"
282 This can only be returned if libcurl bugs. Please report it to us!
283 .IP "CURLM_BAD_SOCKET (5)"
284 The passed-in socket is not a valid one that libcurl already knows about.
285 (Added in 7.15.4)
286 .IP "CURLM_UNKNOWN_OPTION (6)"
287 curl_multi_setopt() with unsupported option
288 (Added in 7.15.4)
289 .IP "CURLM_ADDED_ALREADY (7)"
290 An easy handle already added to a multi handle was attempted to get added a
291 second time. (Added in 7.32.1)
292 .IP "CURLM_RECURSIVE_API_CALL (8)"
293 An API function was called from inside a callback.
294 .SH "CURLSHcode"
295 The "share" interface will return a CURLSHcode to indicate when an error has
296 occurred. Also consider \fIcurl_share_strerror(3)\fP.
297 .IP "CURLSHE_OK (0)"
298 All fine. Proceed as usual.
299 .IP "CURLSHE_BAD_OPTION (1)"
300 An invalid option was passed to the function.
301 .IP "CURLSHE_IN_USE (2)"
302 The share object is currently in use.
303 .IP "CURLSHE_INVALID (3)"
304 An invalid share object was passed to the function.
305 .IP "CURLSHE_NOMEM (4)"
306 Not enough memory was available.
307 (Added in 7.12.0)
308 .IP "CURLSHE_NOT_BUILT_IN (5)"
309 The requested sharing could not be done because the library you use don't have
310 that particular feature enabled. (Added in 7.23.0)
311 .SH "CURLUcode"
312 .IP "CURLUE_BAD_HANDLE (1)"
313 An argument that should be a CURLU pointer was passed in as a NULL.
314 .IP "CURLUE_BAD_PARTPOINTER (2)"
315 A NULL pointer was passed to the 'part' argument of \fIcurl_url_get(3)\fP.
316 .IP "CURLUE_MALFORMED_INPUT (3)"
317 A malformed input was passed to a URL API function.
318 .IP "CURLUE_BAD_PORT_NUMBER (4)"
319 The port number was not a decimal number between 0 and 65535.
320 .IP "CURLUE_UNSUPPORTED_SCHEME (5)"
321 This libcurl build doesn't support the given URL scheme.
322 .IP "CURLUE_URLDECODE (6)"
323 URL decode error, most likely because of rubbish in the input.
324 .IP "CURLUE_OUT_OF_MEMORY (7)"
325 A memory function failed.
326 .IP "CURLUE_USER_NOT_ALLOWED (8)"
327 Credentials was passed in the URL when prohibited.
328 .IP "CURLUE_UNKNOWN_PART (9)"
329 An unknown part ID was passed to a URL API function.
330 .IP "CURLUE_NO_SCHEME (10)"
331 There is no scheme part in the URL.
332 .IP "CURLUE_NO_USER (11)"
333 There is no user part in the URL.
334 .IP "CURLUE_NO_PASSWORD (12)"
335 There is no password part in the URL.
336 .IP "CURLUE_NO_OPTIONS (13)"
337 There is no options part in the URL.
338 .IP "CURLUE_NO_HOST (14)"
339 There is no host part in the URL.
340 .IP "CURLUE_NO_PORT (15)"
341 There is no port part in the URL.
342 .IP "CURLUE_NO_QUERY (16)"
343 There is no query part in the URL.
344 .IP "CURLUE_NO_FRAGMENT (17)"
345 There is no fragment part in the URL.
346 .SH "SEE ALSO"
347 .BR curl_easy_strerror "(3), " curl_multi_strerror "(3), "
348 .BR curl_share_strerror "(3), " CURLOPT_ERRORBUFFER "(3), "
349 .BR CURLOPT_VERBOSE "(3), " CURLOPT_DEBUGFUNCTION "(3) "