Annotation of embedaddon/curl/docs/libcurl/libcurl-errors.3, revision 1.1.1.1
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23: .TH libcurl-errors 3 "March 23, 2020" "libcurl 7.70.0" "libcurl errors"
24:
25: .SH NAME
26: libcurl-errors \- error codes in libcurl
27: .SH DESCRIPTION
28: This man page includes most, if not all, available error codes in libcurl.
29: Why they occur and possibly what you can do to fix the problem are also included.
30: .SH "CURLcode"
31: Almost all "easy" interface functions return a CURLcode error code. No matter
32: what, using the \fIcurl_easy_setopt(3)\fP option \fICURLOPT_ERRORBUFFER(3)\fP
33: is a good idea as it will give you a human readable error string that may
34: offer more details about the cause of the error than just the error code.
35: \fIcurl_easy_strerror(3)\fP can be called to get an error string from a given
36: CURLcode number.
37:
38: CURLcode is one of the following:
39: .IP "CURLE_OK (0)"
40: All fine. Proceed as usual.
41: .IP "CURLE_UNSUPPORTED_PROTOCOL (1)"
42: The URL you passed to libcurl used a protocol that this libcurl does not
43: support. The support might be a compile-time option that you didn't use, it
44: can be a misspelled protocol string or just a protocol libcurl has no code
45: for.
46: .IP "CURLE_FAILED_INIT (2)"
47: Very early initialization code failed. This is likely to be an internal error
48: or problem, or a resource problem where something fundamental couldn't get
49: done at init time.
50: .IP "CURLE_URL_MALFORMAT (3)"
51: The URL was not properly formatted.
52: .IP "CURLE_NOT_BUILT_IN (4)"
53: A requested feature, protocol or option was not found built-in in this libcurl
54: due to a build-time decision. This means that a feature or option was not
55: enabled or explicitly disabled when libcurl was built and in order to get it
56: to function you have to get a rebuilt libcurl.
57: .IP "CURLE_COULDNT_RESOLVE_PROXY (5)"
58: Couldn't resolve proxy. The given proxy host could not be resolved.
59: .IP "CURLE_COULDNT_RESOLVE_HOST (6)"
60: Couldn't resolve host. The given remote host was not resolved.
61: .IP "CURLE_COULDNT_CONNECT (7)"
62: Failed to connect() to host or proxy.
63: .IP "CURLE_WEIRD_SERVER_REPLY (8)"
64: The server sent data libcurl couldn't parse. This error code was known as as
65: \fICURLE_FTP_WEIRD_SERVER_REPLY\fP before 7.51.0.
66: .IP "CURLE_REMOTE_ACCESS_DENIED (9)"
67: We were denied access to the resource given in the URL. For FTP, this occurs
68: while trying to change to the remote directory.
69: .IP "CURLE_FTP_ACCEPT_FAILED (10)"
70: While waiting for the server to connect back when an active FTP session is
71: used, an error code was sent over the control connection or similar.
72: .IP "CURLE_FTP_WEIRD_PASS_REPLY (11)"
73: After having sent the FTP password to the server, libcurl expects a proper
74: reply. This error code indicates that an unexpected code was returned.
75: .IP "CURLE_FTP_ACCEPT_TIMEOUT (12)"
76: During an active FTP session while waiting for the server to connect, the
77: \fICURLOPT_ACCEPTTIMEOUT_MS(3)\fP (or the internal default) timeout expired.
78: .IP "CURLE_FTP_WEIRD_PASV_REPLY (13)"
79: libcurl failed to get a sensible result back from the server as a response to
80: either a PASV or a EPSV command. The server is flawed.
81: .IP "CURLE_FTP_WEIRD_227_FORMAT (14)"
82: FTP servers return a 227-line as a response to a PASV command. If libcurl
83: fails to parse that line, this return code is passed back.
84: .IP "CURLE_FTP_CANT_GET_HOST (15)"
85: An internal failure to lookup the host used for the new connection.
86: .IP "CURLE_HTTP2 (16)"
87: A problem was detected in the HTTP2 framing layer. This is somewhat generic
88: and can be one out of several problems, see the error buffer for details.
89: .IP "CURLE_FTP_COULDNT_SET_TYPE (17)"
90: Received an error when trying to set the transfer mode to binary or ASCII.
91: .IP "CURLE_PARTIAL_FILE (18)"
92: A file transfer was shorter or larger than expected. This happens when the
93: server first reports an expected transfer size, and then delivers data that
94: doesn't match the previously given size.
95: .IP "CURLE_FTP_COULDNT_RETR_FILE (19)"
96: This was either a weird reply to a 'RETR' command or a zero byte transfer
97: complete.
98: .IP "CURLE_QUOTE_ERROR (21)"
99: When sending custom "QUOTE" commands to the remote server, one of the commands
100: returned an error code that was 400 or higher (for FTP) or otherwise
101: indicated unsuccessful completion of the command.
102: .IP "CURLE_HTTP_RETURNED_ERROR (22)"
103: This is returned if \fICURLOPT_FAILONERROR(3)\fP is set TRUE and the HTTP
104: server returns an error code that is >= 400.
105: .IP "CURLE_WRITE_ERROR (23)"
106: An error occurred when writing received data to a local file, or an error was
107: returned to libcurl from a write callback.
108: .IP "CURLE_UPLOAD_FAILED (25)"
109: Failed starting the upload. For FTP, the server typically denied the STOR
110: command. The error buffer usually contains the server's explanation for this.
111: .IP "CURLE_READ_ERROR (26)"
112: There was a problem reading a local file or an error returned by the read
113: callback.
114: .IP "CURLE_OUT_OF_MEMORY (27)"
115: A memory allocation request failed. This is serious badness and
116: things are severely screwed up if this ever occurs.
117: .IP "CURLE_OPERATION_TIMEDOUT (28)"
118: Operation timeout. The specified time-out period was reached according to the
119: conditions.
120: .IP "CURLE_FTP_PORT_FAILED (30)"
121: The FTP PORT command returned error. This mostly happens when you haven't
122: specified a good enough address for libcurl to use. See
123: \fICURLOPT_FTPPORT(3)\fP.
124: .IP "CURLE_FTP_COULDNT_USE_REST (31)"
125: The FTP REST command returned error. This should never happen if the server is
126: sane.
127: .IP "CURLE_RANGE_ERROR (33)"
128: The server does not support or accept range requests.
129: .IP "CURLE_HTTP_POST_ERROR (34)"
130: This is an odd error that mainly occurs due to internal confusion.
131: .IP "CURLE_SSL_CONNECT_ERROR (35)"
132: A problem occurred somewhere in the SSL/TLS handshake. You really want the
133: error buffer and read the message there as it pinpoints the problem slightly
134: more. Could be certificates (file formats, paths, permissions), passwords, and
135: others.
136: .IP "CURLE_BAD_DOWNLOAD_RESUME (36)"
137: The download could not be resumed because the specified offset was out of the
138: file boundary.
139: .IP "CURLE_FILE_COULDNT_READ_FILE (37)"
140: A file given with FILE:// couldn't be opened. Most likely because the file
141: path doesn't identify an existing file. Did you check file permissions?
142: .IP "CURLE_LDAP_CANNOT_BIND (38)"
143: LDAP cannot bind. LDAP bind operation failed.
144: .IP "CURLE_LDAP_SEARCH_FAILED (39)"
145: LDAP search failed.
146: .IP "CURLE_FUNCTION_NOT_FOUND (41)"
147: Function not found. A required zlib function was not found.
148: .IP "CURLE_ABORTED_BY_CALLBACK (42)"
149: Aborted by callback. A callback returned "abort" to libcurl.
150: .IP "CURLE_BAD_FUNCTION_ARGUMENT (43)"
151: A function was called with a bad parameter.
152: .IP "CURLE_INTERFACE_FAILED (45)"
153: Interface error. A specified outgoing interface could not be used. Set which
154: interface to use for outgoing connections' source IP address with
155: \fICURLOPT_INTERFACE(3)\fP.
156: .IP "CURLE_TOO_MANY_REDIRECTS (47)"
157: Too many redirects. When following redirects, libcurl hit the maximum amount.
158: Set your limit with \fICURLOPT_MAXREDIRS(3)\fP.
159: .IP "CURLE_UNKNOWN_OPTION (48)"
160: An option passed to libcurl is not recognized/known. Refer to the appropriate
161: documentation. This is most likely a problem in the program that uses
162: libcurl. The error buffer might contain more specific information about which
163: exact option it concerns.
164: .IP "CURLE_TELNET_OPTION_SYNTAX (49)"
165: A telnet option string was Illegally formatted.
166: .IP "CURLE_GOT_NOTHING (52)"
167: Nothing was returned from the server, and under the circumstances, getting
168: nothing is considered an error.
169: .IP "CURLE_SSL_ENGINE_NOTFOUND (53)"
170: The specified crypto engine wasn't found.
171: .IP "CURLE_SSL_ENGINE_SETFAILED (54)"
172: Failed setting the selected SSL crypto engine as default!
173: .IP "CURLE_SEND_ERROR (55)"
174: Failed sending network data.
175: .IP "CURLE_RECV_ERROR (56)"
176: Failure with receiving network data.
177: .IP "CURLE_SSL_CERTPROBLEM (58)"
178: problem with the local client certificate.
179: .IP "CURLE_SSL_CIPHER (59)"
180: Couldn't use specified cipher.
181: .IP "CURLE_PEER_FAILED_VERIFICATION (60)"
182: The remote server's SSL certificate or SSH md5 fingerprint was deemed not OK.
183: This error code has been unified with CURLE_SSL_CACERT since 7.62.0. Its
184: previous value was 51.
185: .IP "CURLE_BAD_CONTENT_ENCODING (61)"
186: Unrecognized transfer encoding.
187: .IP "CURLE_LDAP_INVALID_URL (62)"
188: Invalid LDAP URL.
189: .IP "CURLE_FILESIZE_EXCEEDED (63)"
190: Maximum file size exceeded.
191: .IP "CURLE_USE_SSL_FAILED (64)"
192: Requested FTP SSL level failed.
193: .IP "CURLE_SEND_FAIL_REWIND (65)"
194: When doing a send operation curl had to rewind the data to retransmit, but the
195: rewinding operation failed.
196: .IP "CURLE_SSL_ENGINE_INITFAILED (66)"
197: Initiating the SSL Engine failed.
198: .IP "CURLE_LOGIN_DENIED (67)"
199: The remote server denied curl to login (Added in 7.13.1)
200: .IP "CURLE_TFTP_NOTFOUND (68)"
201: File not found on TFTP server.
202: .IP "CURLE_TFTP_PERM (69)"
203: Permission problem on TFTP server.
204: .IP "CURLE_REMOTE_DISK_FULL (70)"
205: Out of disk space on the server.
206: .IP "CURLE_TFTP_ILLEGAL (71)"
207: Illegal TFTP operation.
208: .IP "CURLE_TFTP_UNKNOWNID (72)"
209: Unknown TFTP transfer ID.
210: .IP "CURLE_REMOTE_FILE_EXISTS (73)"
211: File already exists and will not be overwritten.
212: .IP "CURLE_TFTP_NOSUCHUSER (74)"
213: This error should never be returned by a properly functioning TFTP server.
214: .IP "CURLE_CONV_FAILED (75)"
215: Character conversion failed.
216: .IP "CURLE_CONV_REQD (76)"
217: Caller must register conversion callbacks.
218: .IP "CURLE_SSL_CACERT_BADFILE (77)"
219: Problem with reading the SSL CA cert (path? access rights?)
220: .IP "CURLE_REMOTE_FILE_NOT_FOUND (78)"
221: The resource referenced in the URL does not exist.
222: .IP "CURLE_SSH (79)"
223: An unspecified error occurred during the SSH session.
224: .IP "CURLE_SSL_SHUTDOWN_FAILED (80)"
225: Failed to shut down the SSL connection.
226: .IP "CURLE_AGAIN (81)"
227: Socket is not ready for send/recv wait till it's ready and try again. This
228: return code is only returned from \fIcurl_easy_recv(3)\fP and
229: \fIcurl_easy_send(3)\fP (Added in 7.18.2)
230: .IP "CURLE_SSL_CRL_BADFILE (82)"
231: Failed to load CRL file (Added in 7.19.0)
232: .IP "CURLE_SSL_ISSUER_ERROR (83)"
233: Issuer check failed (Added in 7.19.0)
234: .IP "CURLE_FTP_PRET_FAILED (84)"
235: The FTP server does not understand the PRET command at all or does not support
236: the given argument. Be careful when using \fICURLOPT_CUSTOMREQUEST(3)\fP, a
237: custom LIST command will be sent with PRET CMD before PASV as well. (Added in
238: 7.20.0)
239: .IP "CURLE_RTSP_CSEQ_ERROR (85)"
240: Mismatch of RTSP CSeq numbers.
241: .IP "CURLE_RTSP_SESSION_ERROR (86)"
242: Mismatch of RTSP Session Identifiers.
243: .IP "CURLE_FTP_BAD_FILE_LIST (87)"
244: Unable to parse FTP file list (during FTP wildcard downloading).
245: .IP "CURLE_CHUNK_FAILED (88)"
246: Chunk callback reported error.
247: .IP "CURLE_NO_CONNECTION_AVAILABLE (89)"
248: (For internal use only, will never be returned by libcurl) No connection
249: available, the session will be queued. (added in 7.30.0)
250: .IP "CURLE_SSL_PINNEDPUBKEYNOTMATCH (90)"
251: Failed to match the pinned key specified with \fICURLOPT_PINNEDPUBLICKEY(3)\fP.
252: .IP "CURLE_SSL_INVALIDCERTSTATUS (91)"
253: Status returned failure when asked with \fICURLOPT_SSL_VERIFYSTATUS(3)\fP.
254: .IP "CURLE_HTTP2_STREAM (92)"
255: Stream error in the HTTP/2 framing layer.
256: .IP "CURLE_RECURSIVE_API_CALL (93)"
257: An API function was called from inside a callback.
258: .IP "CURLE_AUTH_ERROR (94)"
259: An authentication function returned an error.
260: .IP "CURLE_HTTP3 (95)"
261: A problem was detected in the HTTP/3 layer. This is somewhat generic and can
262: be one out of several problems, see the error buffer for details.
263: .IP "CURLE_QUIC_CONNECT_ERROR (96)"
264: QUIC connection error. This error may be caused by an SSL library error. QUIC
265: is the protocol used for HTTP/3 transfers.
266: .IP "CURLE_OBSOLETE*"
267: These error codes will never be returned. They were used in an old libcurl
268: version and are currently unused.
269: .SH "CURLMcode"
270: This is the generic return code used by functions in the libcurl multi
271: interface. Also consider \fIcurl_multi_strerror(3)\fP.
272: .IP "CURLM_CALL_MULTI_PERFORM (-1)"
273: This is not really an error. It means you should call
274: \fIcurl_multi_perform(3)\fP again without doing select() or similar in
275: between. Before version 7.20.0 this could be returned by
276: \fIcurl_multi_perform(3)\fP, but in later versions this return code is never
277: used.
278: .IP "CURLM_CALL_MULTI_SOCKET (-1)"
279: An alias for CURLM_CALL_MULTI_PERFORM. Never returned by modern libcurl
280: versions.
281: .IP "CURLM_OK (0)"
282: Things are fine.
283: .IP "CURLM_BAD_HANDLE (1)"
284: The passed-in handle is not a valid CURLM handle.
285: .IP "CURLM_BAD_EASY_HANDLE (2)"
286: An easy handle was not good/valid. It could mean that it isn't an easy handle
287: at all, or possibly that the handle already is in use by this or another multi
288: handle.
289: .IP "CURLM_OUT_OF_MEMORY (3)"
290: You are doomed.
291: .IP "CURLM_INTERNAL_ERROR (4)"
292: This can only be returned if libcurl bugs. Please report it to us!
293: .IP "CURLM_BAD_SOCKET (5)"
294: The passed-in socket is not a valid one that libcurl already knows about.
295: (Added in 7.15.4)
296: .IP "CURLM_UNKNOWN_OPTION (6)"
297: curl_multi_setopt() with unsupported option
298: (Added in 7.15.4)
299: .IP "CURLM_ADDED_ALREADY (7)"
300: An easy handle already added to a multi handle was attempted to get added a
301: second time. (Added in 7.32.1)
302: .IP "CURLM_RECURSIVE_API_CALL (8)"
303: An API function was called from inside a callback.
304: .IP "CURLM_WAKEUP_FAILURE (9)"
305: Wakeup is unavailable or failed.
306: .IP "CURLM_BAD_FUNCTION_ARGUMENT (10)"
307: A function was called with a bad parameter.
308: .SH "CURLSHcode"
309: The "share" interface will return a CURLSHcode to indicate when an error has
310: occurred. Also consider \fIcurl_share_strerror(3)\fP.
311: .IP "CURLSHE_OK (0)"
312: All fine. Proceed as usual.
313: .IP "CURLSHE_BAD_OPTION (1)"
314: An invalid option was passed to the function.
315: .IP "CURLSHE_IN_USE (2)"
316: The share object is currently in use.
317: .IP "CURLSHE_INVALID (3)"
318: An invalid share object was passed to the function.
319: .IP "CURLSHE_NOMEM (4)"
320: Not enough memory was available.
321: (Added in 7.12.0)
322: .IP "CURLSHE_NOT_BUILT_IN (5)"
323: The requested sharing could not be done because the library you use don't have
324: that particular feature enabled. (Added in 7.23.0)
325: .SH "CURLUcode"
326: .IP "CURLUE_BAD_HANDLE (1)"
327: An argument that should be a CURLU pointer was passed in as a NULL.
328: .IP "CURLUE_BAD_PARTPOINTER (2)"
329: A NULL pointer was passed to the 'part' argument of \fIcurl_url_get(3)\fP.
330: .IP "CURLUE_MALFORMED_INPUT (3)"
331: A malformed input was passed to a URL API function.
332: .IP "CURLUE_BAD_PORT_NUMBER (4)"
333: The port number was not a decimal number between 0 and 65535.
334: .IP "CURLUE_UNSUPPORTED_SCHEME (5)"
335: This libcurl build doesn't support the given URL scheme.
336: .IP "CURLUE_URLDECODE (6)"
337: URL decode error, most likely because of rubbish in the input.
338: .IP "CURLUE_OUT_OF_MEMORY (7)"
339: A memory function failed.
340: .IP "CURLUE_USER_NOT_ALLOWED (8)"
341: Credentials was passed in the URL when prohibited.
342: .IP "CURLUE_UNKNOWN_PART (9)"
343: An unknown part ID was passed to a URL API function.
344: .IP "CURLUE_NO_SCHEME (10)"
345: There is no scheme part in the URL.
346: .IP "CURLUE_NO_USER (11)"
347: There is no user part in the URL.
348: .IP "CURLUE_NO_PASSWORD (12)"
349: There is no password part in the URL.
350: .IP "CURLUE_NO_OPTIONS (13)"
351: There is no options part in the URL.
352: .IP "CURLUE_NO_HOST (14)"
353: There is no host part in the URL.
354: .IP "CURLUE_NO_PORT (15)"
355: There is no port part in the URL.
356: .IP "CURLUE_NO_QUERY (16)"
357: There is no query part in the URL.
358: .IP "CURLUE_NO_FRAGMENT (17)"
359: There is no fragment part in the URL.
360: .SH "SEE ALSO"
361: .BR curl_easy_strerror "(3), " curl_multi_strerror "(3), "
362: .BR curl_share_strerror "(3), " CURLOPT_ERRORBUFFER "(3), "
363: .BR CURLOPT_VERBOSE "(3), " CURLOPT_DEBUGFUNCTION "(3) "
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