aboutsummaryrefslogtreecommitdiff
path: root/docs/libcurl/curl_easy_setopt.3
blob: fc361d80c47f0a27d97d6d88fb6317186980d08e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
.\" **************************************************************************
.\" *                                  _   _ ____  _
.\" *  Project                     ___| | | |  _ \| |
.\" *                             / __| | | | |_) | |
.\" *                            | (__| |_| |  _ <| |___
.\" *                             \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
.\" *
.\" * This software is licensed as described in the file COPYING, which
.\" * you should have received as part of this distribution. The terms
.\" * are also available at https://curl.haxx.se/docs/copyright.html.
.\" *
.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
.\" * copies of the Software, and permit persons to whom the Software is
.\" * furnished to do so, under the terms of the COPYING file.
.\" *
.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
.\" * KIND, either express or implied.
.\" *
.\" **************************************************************************
.\"
.TH curl_easy_setopt 3 "25 Jun 2014" "libcurl 7.38.0" "libcurl Manual"
.SH NAME
curl_easy_setopt \- set options for a curl easy handle
.SH SYNOPSIS
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLoption option, parameter);
.SH DESCRIPTION
\fIcurl_easy_setopt(3)\fP is used to tell libcurl how to behave. By setting
the appropriate options, the application can change libcurl's behavior.  All
options are set with an \fIoption\fP followed by a \fIparameter\fP. That
parameter can be a \fBlong\fP, a \fBfunction pointer\fP, an \fBobject
pointer\fP or a \fBcurl_off_t\fP, depending on what the specific option
expects. Read this manual carefully as bad input values may cause libcurl to
behave badly!  You can only set one option in each function call. A typical
application uses many \fIcurl_easy_setopt(3)\fP calls in the setup phase.

Options set with this function call are valid for all forthcoming transfers
performed using this \fIhandle\fP.  The options are not in any way reset
between transfers, so if you want subsequent transfers with different options,
you must change them between the transfers. You can optionally reset all
options back to internal default with \fIcurl_easy_reset(3)\fP.

Strings passed to libcurl as 'char *' arguments, are copied by the library;
thus the string storage associated to the pointer argument may be overwritten
after \fIcurl_easy_setopt(3)\fP returns. The only exception to this rule is
really \fICURLOPT_POSTFIELDS(3)\fP, but the alternative that copies the string
\fICURLOPT_COPYPOSTFIELDS(3)\fP has some usage characteristics you need to
read up on.

The order in which the options are set does not matter.

Before version 7.17.0, strings were not copied. Instead the user was forced
keep them available until libcurl no longer needed them.

The \fIhandle\fP is the return code from a \fIcurl_easy_init(3)\fP or
\fIcurl_easy_duphandle(3)\fP call.
.SH BEHAVIOR OPTIONS
.IP CURLOPT_VERBOSE
Display verbose information. See \fICURLOPT_VERBOSE(3)\fP
.IP CURLOPT_HEADER
Include the header in the body output. See \fICURLOPT_HEADER(3)\fP
.IP CURLOPT_NOPROGRESS
Shut off the progress meter. See \fICURLOPT_NOPROGRESS(3)\fP
.IP CURLOPT_NOSIGNAL
Do not install signal handlers. See \fICURLOPT_NOSIGNAL(3)\fP
.IP CURLOPT_WILDCARDMATCH
Transfer multiple files according to a file name pattern. See \fICURLOPT_WILDCARDMATCH(3)\fP
.SH CALLBACK OPTIONS
.IP CURLOPT_WRITEFUNCTION
Callback for writing data. See \fICURLOPT_WRITEFUNCTION(3)\fP
.IP CURLOPT_WRITEDATA
Data pointer to pass to the write callback. See \fICURLOPT_WRITEDATA(3)\fP
.IP CURLOPT_READFUNCTION
Callback for reading data. See \fICURLOPT_READFUNCTION(3)\fP
.IP CURLOPT_READDATA
Data pointer to pass to the read callback. See \fICURLOPT_READDATA(3)\fP
.IP CURLOPT_IOCTLFUNCTION
Callback for I/O operations. See \fICURLOPT_IOCTLFUNCTION(3)\fP
.IP CURLOPT_IOCTLDATA
Data pointer to pass to the I/O callback. See \fICURLOPT_IOCTLDATA(3)\fP
.IP CURLOPT_SEEKFUNCTION
Callback for seek operations. See \fICURLOPT_SEEKFUNCTION(3)\fP
.IP CURLOPT_SEEKDATA
Data pointer to pass to the seek callback. See \fICURLOPT_SEEKDATA(3)\fP
.IP CURLOPT_SOCKOPTFUNCTION
Callback for sockopt operations. See \fICURLOPT_SOCKOPTFUNCTION(3)\fP
.IP CURLOPT_SOCKOPTDATA
Data pointer to pass to the sockopt callback. See \fICURLOPT_SOCKOPTDATA(3)\fP
.IP CURLOPT_OPENSOCKETFUNCTION
Callback for socket creation. See \fICURLOPT_OPENSOCKETFUNCTION(3)\fP
.IP CURLOPT_OPENSOCKETDATA
Data pointer to pass to the open socket callback. See \fICURLOPT_OPENSOCKETDATA(3)\fP
.IP CURLOPT_CLOSESOCKETFUNCTION
Callback for closing socket. See \fICURLOPT_CLOSESOCKETFUNCTION(3)\fP
.IP CURLOPT_CLOSESOCKETDATA
Data pointer to pass to the close socket callback. See \fICURLOPT_CLOSESOCKETDATA(3)\fP
.IP CURLOPT_PROGRESSFUNCTION
OBSOLETE callback for progress meter. See \fICURLOPT_PROGRESSFUNCTION(3)\fP
.IP CURLOPT_PROGRESSDATA
Data pointer to pass to the progress meter callback. See \fICURLOPT_PROGRESSDATA(3)\fP
.IP CURLOPT_XFERINFOFUNCTION
Callback for progress meter. See \fICURLOPT_XFERINFOFUNCTION(3)\fP
.IP CURLOPT_XFERINFODATA
Data pointer to pass to the progress meter callback. See \fICURLOPT_XFERINFODATA(3)\fP
.IP CURLOPT_HEADERFUNCTION
Callback for writing received headers. See \fICURLOPT_HEADERFUNCTION(3)\fP
.IP CURLOPT_HEADERDATA
Data pointer to pass to the header callback. See \fICURLOPT_HEADERDATA(3)\fP
.IP CURLOPT_DEBUGFUNCTION
Callback for debug information. See \fICURLOPT_DEBUGFUNCTION(3)\fP
.IP CURLOPT_DEBUGDATA
Data pointer to pass to the debug callback. See \fICURLOPT_DEBUGDATA(3)\fP
.IP CURLOPT_SSL_CTX_FUNCTION
Callback for SSL context logic. See \fICURLOPT_SSL_CTX_FUNCTION(3)\fP
.IP CURLOPT_SSL_CTX_DATA
Data pointer to pass to the SSL context callback. See \fICURLOPT_SSL_CTX_DATA(3)\fP
.IP CURLOPT_CONV_TO_NETWORK_FUNCTION
Callback for code base conversion. See \fICURLOPT_CONV_TO_NETWORK_FUNCTION(3)\fP
.IP CURLOPT_CONV_FROM_NETWORK_FUNCTION
Callback for code base conversion. See \fICURLOPT_CONV_FROM_NETWORK_FUNCTION(3)\fP
.IP CURLOPT_CONV_FROM_UTF8_FUNCTION
Callback for code base conversion. See \fICURLOPT_CONV_FROM_UTF8_FUNCTION(3)\fP
.IP CURLOPT_INTERLEAVEFUNCTION
Callback for RTSP interleaved data. See \fICURLOPT_INTERLEAVEFUNCTION(3)\fP
.IP CURLOPT_INTERLEAVEDATA
Data pointer to pass to the RTSP interleave callback. See \fICURLOPT_INTERLEAVEDATA(3)\fP
.IP CURLOPT_CHUNK_BGN_FUNCTION
Callback for wildcard download start of chunk. See \fICURLOPT_CHUNK_BGN_FUNCTION(3)\fP
.IP CURLOPT_CHUNK_END_FUNCTION
Callback for wildcard download end of chunk. See \fICURLOPT_CHUNK_END_FUNCTION(3)\fP
.IP CURLOPT_CHUNK_DATA
Data pointer to pass to the chunk callbacks. See \fICURLOPT_CHUNK_DATA(3)\fP
.IP CURLOPT_FNMATCH_FUNCTION
Callback for wildcard matching. See \fICURLOPT_FNMATCH_FUNCTION(3)\fP
.IP CURLOPT_FNMATCH_DATA
Data pointer to pass to the wildcard matching callback. See \fICURLOPT_FNMATCH_DATA(3)\fP
.IP CURLOPT_SUPPRESS_CONNECT_HEADERS
Suppress proxy CONNECT response headers from user callbacks. See \fICURLOPT_SUPPRESS_CONNECT_HEADERS(3)\fP
.IP CURLOPT_RESOLVER_START_FUNCTION
Callback to be called before a new resolve request is started. See \fICURLOPT_RESOLVER_START_FUNCTION(3)\fP
.IP CURLOPT_RESOLVER_START_DATA
Data pointer to pass to resolver start callback. See \fICURLOPT_RESOLVER_START_DATA(3)\fP
.SH ERROR OPTIONS
.IP CURLOPT_ERRORBUFFER
Error message buffer. See \fICURLOPT_ERRORBUFFER(3)\fP
.IP CURLOPT_STDERR
stderr replacement stream. See \fICURLOPT_STDERR(3)\fP
.IP CURLOPT_FAILONERROR
Fail on HTTP 4xx errors. \fICURLOPT_FAILONERROR(3)\fP
.IP CURLOPT_KEEP_SENDING_ON_ERROR
Keep sending on HTTP >= 300 errors. \fICURLOPT_KEEP_SENDING_ON_ERROR(3)\fP
.SH NETWORK OPTIONS
.IP CURLOPT_URL
URL to work on. See \fICURLOPT_URL(3)\fP
.IP CURLOPT_PATH_AS_IS
Disable squashing /../ and /./ sequences in the path. See \fICURLOPT_PATH_AS_IS(3)\fP
.IP CURLOPT_PROTOCOLS
Allowed protocols. See \fICURLOPT_PROTOCOLS(3)\fP
.IP CURLOPT_REDIR_PROTOCOLS
Protocols to allow redirects to. See \fICURLOPT_REDIR_PROTOCOLS(3)\fP
.IP CURLOPT_DEFAULT_PROTOCOL
Default protocol. See \fICURLOPT_DEFAULT_PROTOCOL(3)\fP
.IP CURLOPT_PROXY
Proxy to use. See \fICURLOPT_PROXY(3)\fP
.IP CURLOPT_PRE_PROXY
Socks proxy to use. See \fICURLOPT_PRE_PROXY(3)\fP
.IP CURLOPT_PROXYPORT
Proxy port to use. See \fICURLOPT_PROXYPORT(3)\fP
.IP CURLOPT_PROXYTYPE
Proxy type. See \fICURLOPT_PROXYTYPE(3)\fP
.IP CURLOPT_NOPROXY
Filter out hosts from proxy use. \fICURLOPT_NOPROXY(3)\fP
.IP CURLOPT_HTTPPROXYTUNNEL
Tunnel through the HTTP proxy. \fICURLOPT_HTTPPROXYTUNNEL(3)\fP
.IP CURLOPT_CONNECT_TO
Connect to a specific host and port. See \fICURLOPT_CONNECT_TO(3)\fP
.IP CURLOPT_SOCKS5_AUTH
Socks5 authentication methods. See \fICURLOPT_SOCKS5_AUTH(3)\fP
.IP CURLOPT_SOCKS5_GSSAPI_SERVICE
Socks5 GSSAPI service name. \fICURLOPT_SOCKS5_GSSAPI_SERVICE(3)\fP
.IP CURLOPT_SOCKS5_GSSAPI_NEC
Socks5 GSSAPI NEC mode. See \fICURLOPT_SOCKS5_GSSAPI_NEC(3)\fP
.IP CURLOPT_PROXY_SERVICE_NAME
Proxy authentication service name. \fICURLOPT_PROXY_SERVICE_NAME(3)\fP
.IP CURLOPT_HAPROXYPROTOCOL
Send an HAProxy PROXY protocol v1 header. See \fICURLOPT_HAPROXYPROTOCOL(3)\fP
.IP CURLOPT_SERVICE_NAME
Authentication service name. \fICURLOPT_SERVICE_NAME(3)\fP
.IP CURLOPT_INTERFACE
Bind connection locally to this. See \fICURLOPT_INTERFACE(3)\fP
.IP CURLOPT_LOCALPORT
Bind connection locally to this port. See \fICURLOPT_LOCALPORT(3)\fP
.IP CURLOPT_LOCALPORTRANGE
Bind connection locally to port range. See \fICURLOPT_LOCALPORTRANGE(3)\fP
.IP CURLOPT_DNS_CACHE_TIMEOUT
Timeout for DNS cache. See \fICURLOPT_DNS_CACHE_TIMEOUT(3)\fP
.IP CURLOPT_DNS_USE_GLOBAL_CACHE
OBSOLETE Enable global DNS cache. See \fICURLOPT_DNS_USE_GLOBAL_CACHE(3)\fP
.IP CURLOPT_DOH_URL
Use this DOH server for name resolves. See \fICURLOPT_DOH_URL(3)\fP
.IP CURLOPT_BUFFERSIZE
Ask for alternate buffer size. See \fICURLOPT_BUFFERSIZE(3)\fP
.IP CURLOPT_PORT
Port number to connect to. See \fICURLOPT_PORT(3)\fP
.IP CURLOPT_TCP_FASTOPEN
Enable TFO, TCP Fast Open. See \fICURLOPT_TCP_FASTOPEN(3)\fP
.IP CURLOPT_TCP_NODELAY
Disable the Nagle algorithm. See \fICURLOPT_TCP_NODELAY(3)\fP
.IP CURLOPT_ADDRESS_SCOPE
IPv6 scope for local addresses. See \fICURLOPT_ADDRESS_SCOPE(3)\fP
.IP CURLOPT_TCP_KEEPALIVE
Enable TCP keep-alive. See \fICURLOPT_TCP_KEEPALIVE(3)\fP
.IP CURLOPT_TCP_KEEPIDLE
Idle time before sending keep-alive. See \fICURLOPT_TCP_KEEPIDLE(3)\fP
.IP CURLOPT_TCP_KEEPINTVL
Interval between keep-alive probes. See \fICURLOPT_TCP_KEEPINTVL(3)\fP
.IP CURLOPT_UNIX_SOCKET_PATH
Path to a Unix domain socket. See \fICURLOPT_UNIX_SOCKET_PATH(3)\fP
.IP CURLOPT_ABSTRACT_UNIX_SOCKET
Path to an abstract Unix domain socket. See \fICURLOPT_ABSTRACT_UNIX_SOCKET(3)\fP
.SH NAMES and PASSWORDS OPTIONS (Authentication)
.IP CURLOPT_NETRC
Enable .netrc parsing. See \fICURLOPT_NETRC(3)\fP
.IP CURLOPT_NETRC_FILE
\&.netrc file name. See \fICURLOPT_NETRC_FILE(3)\fP
.IP CURLOPT_USERPWD
User name and password. See \fICURLOPT_USERPWD(3)\fP
.IP CURLOPT_PROXYUSERPWD
Proxy user name and password. See \fICURLOPT_PROXYUSERPWD(3)\fP
.IP CURLOPT_USERNAME
User name. See \fICURLOPT_USERNAME(3)\fP
.IP CURLOPT_PASSWORD
Password. See \fICURLOPT_PASSWORD(3)\fP
.IP CURLOPT_LOGIN_OPTIONS
Login options. See \fICURLOPT_LOGIN_OPTIONS(3)\fP
.IP CURLOPT_PROXYUSERNAME
Proxy user name. See \fICURLOPT_PROXYUSERNAME(3)\fP
.IP CURLOPT_PROXYPASSWORD
Proxy password. See \fICURLOPT_PROXYPASSWORD(3)\fP
.IP CURLOPT_HTTPAUTH
HTTP server authentication methods. See \fICURLOPT_HTTPAUTH(3)\fP
.IP CURLOPT_TLSAUTH_USERNAME
TLS authentication user name. See \fICURLOPT_TLSAUTH_USERNAME(3)\fP
.IP CURLOPT_PROXY_TLSAUTH_USERNAME
Proxy TLS authentication user name. See \fICURLOPT_PROXY_TLSAUTH_USERNAME(3)\fP
.IP CURLOPT_TLSAUTH_PASSWORD
TLS authentication password. See \fICURLOPT_TLSAUTH_PASSWORD(3)\fP
.IP CURLOPT_PROXY_TLSAUTH_PASSWORD
Proxy TLS authentication password. See \fICURLOPT_PROXY_TLSAUTH_PASSWORD(3)\fP
.IP CURLOPT_TLSAUTH_TYPE
TLS authentication methods. See \fICURLOPT_TLSAUTH_TYPE(3)\fP
.IP CURLOPT_PROXY_TLSAUTH_TYPE
Proxy TLS authentication methods. See \fICURLOPT_PROXY_TLSAUTH_TYPE(3)\fP
.IP CURLOPT_PROXYAUTH
HTTP proxy authentication methods. See \fICURLOPT_PROXYAUTH(3)\fP
.IP CURLOPT_SASL_IR
Enable SASL initial response. See \fICURLOPT_SASL_IR(3)\fP
.IP CURLOPT_XOAUTH2_BEARER
OAuth2 bearer token. See \fICURLOPT_XOAUTH2_BEARER(3)\fP
.IP CURLOPT_DISALLOW_USERNAME_IN_URL
Don't allow username in URL. See \fICURLOPT_DISALLOW_USERNAME_IN_URL(3)\fP
.SH HTTP OPTIONS
.IP CURLOPT_AUTOREFERER
Automatically set Referer: header. See \fICURLOPT_AUTOREFERER(3)\fP
.IP CURLOPT_ACCEPT_ENCODING
Accept-Encoding and automatic decompressing data. See \fICURLOPT_ACCEPT_ENCODING(3)\fP
.IP CURLOPT_TRANSFER_ENCODING
Request Transfer-Encoding. See \fICURLOPT_TRANSFER_ENCODING(3)\fP
.IP CURLOPT_FOLLOWLOCATION
Follow HTTP redirects. See \fICURLOPT_FOLLOWLOCATION(3)\fP
.IP CURLOPT_UNRESTRICTED_AUTH
Do not restrict authentication to original host. \fICURLOPT_UNRESTRICTED_AUTH(3)\fP
.IP CURLOPT_MAXREDIRS
Maximum number of redirects to follow. See \fICURLOPT_MAXREDIRS(3)\fP
.IP CURLOPT_POSTREDIR
How to act on redirects after POST. See \fICURLOPT_POSTREDIR(3)\fP
.IP CURLOPT_PUT
Issue an HTTP PUT request. See \fICURLOPT_PUT(3)\fP
.IP CURLOPT_POST
Issue an HTTP POST request. See \fICURLOPT_POST(3)\fP
.IP CURLOPT_POSTFIELDS
Send a POST with this data. See \fICURLOPT_POSTFIELDS(3)\fP
.IP CURLOPT_POSTFIELDSIZE
The POST data is this big. See \fICURLOPT_POSTFIELDSIZE(3)\fP
.IP CURLOPT_POSTFIELDSIZE_LARGE
The POST data is this big. See \fICURLOPT_POSTFIELDSIZE_LARGE(3)\fP
.IP CURLOPT_COPYPOSTFIELDS
Send a POST with this data - and copy it. See \fICURLOPT_COPYPOSTFIELDS(3)\fP
.IP CURLOPT_HTTPPOST
Multipart formpost HTTP POST. See \fICURLOPT_HTTPPOST(3)\fP
.IP CURLOPT_REFERER
Referer: header. See \fICURLOPT_REFERER(3)\fP
.IP CURLOPT_USERAGENT
User-Agent: header. See \fICURLOPT_USERAGENT(3)\fP
.IP CURLOPT_HTTPHEADER
Custom HTTP headers. See \fICURLOPT_HTTPHEADER(3)\fP
.IP CURLOPT_HEADEROPT
Control custom headers. See \fICURLOPT_HEADEROPT(3)\fP
.IP CURLOPT_PROXYHEADER
Custom HTTP headers sent to proxy. See \fICURLOPT_PROXYHEADER(3)\fP
.IP CURLOPT_HTTP200ALIASES
Alternative versions of 200 OK. See \fICURLOPT_HTTP200ALIASES(3)\fP
.IP CURLOPT_COOKIE
Cookie(s) to send. See \fICURLOPT_COOKIE(3)\fP
.IP CURLOPT_COOKIEFILE
File to read cookies from. See \fICURLOPT_COOKIEFILE(3)\fP
.IP CURLOPT_COOKIEJAR
File to write cookies to. See \fICURLOPT_COOKIEJAR(3)\fP
.IP CURLOPT_COOKIESESSION
Start a new cookie session. See \fICURLOPT_COOKIESESSION(3)\fP
.IP CURLOPT_COOKIELIST
Add or control cookies. See \fICURLOPT_COOKIELIST(3)\fP
.IP CURLOPT_ALTSVC
Specify the Alt-Svc: cache file name. See \fICURLOPT_ALTSVC(3)\fP
.IP CURLOPT_ALTSVC_CTRL
Enable and configure Alt-Svc: treatment. See \fICURLOPT_ALTSVC_CTRL(3)\fP
.IP CURLOPT_HTTPGET
Do an HTTP GET request. See \fICURLOPT_HTTPGET(3)\fP
.IP CURLOPT_REQUEST_TARGET
Set the request target. \fICURLOPT_REQUEST_TARGET(3)\fP
.IP CURLOPT_HTTP_VERSION
HTTP version to use. \fICURLOPT_HTTP_VERSION(3)\fP
.IP CURLOPT_HTTP09_ALLOWED
Allow HTTP/0.9 responses. \fICURLOPT_HTTP09_ALLOWED(3)\fP
.IP CURLOPT_IGNORE_CONTENT_LENGTH
Ignore Content-Length. See \fICURLOPT_IGNORE_CONTENT_LENGTH(3)\fP
.IP CURLOPT_HTTP_CONTENT_DECODING
Disable Content decoding. See \fICURLOPT_HTTP_CONTENT_DECODING(3)\fP
.IP CURLOPT_HTTP_TRANSFER_DECODING
Disable Transfer decoding. See \fICURLOPT_HTTP_TRANSFER_DECODING(3)\fP
.IP CURLOPT_EXPECT_100_TIMEOUT_MS
100-continue timeout. See \fICURLOPT_EXPECT_100_TIMEOUT_MS(3)\fP
.IP CURLOPT_TRAILERFUNCTION
Set callback for sending trailing headers. See
\fICURLOPT_TRAILERFUNCTION(3)\fP
.IP CURLOPT_TRAILERDATA
Custom pointer passed to the trailing headers callback. See
\fICURLOPT_TRAILERDATA(3)\fP
.IP CURLOPT_PIPEWAIT
Wait on connection to pipeline on it. See \fICURLOPT_PIPEWAIT(3)\fP
.IP CURLOPT_STREAM_DEPENDS
This HTTP/2 stream depends on another. See \fICURLOPT_STREAM_DEPENDS(3)\fP
.IP CURLOPT_STREAM_DEPENDS_E
This HTTP/2 stream depends on another exclusively. See
\fICURLOPT_STREAM_DEPENDS_E(3)\fP
.IP CURLOPT_STREAM_WEIGHT
Set this HTTP/2 stream's weight. See \fICURLOPT_STREAM_WEIGHT(3)\fP
.SH SMTP OPTIONS
.IP CURLOPT_MAIL_FROM
Address of the sender. See \fICURLOPT_MAIL_FROM(3)\fP
.IP CURLOPT_MAIL_RCPT
Address of the recipients. See \fICURLOPT_MAIL_RCPT(3)\fP
.IP CURLOPT_MAIL_AUTH
Authentication address. See \fICURLOPT_MAIL_AUTH(3)\fP
.SH TFTP OPTIONS
.IP CURLOPT_TFTP_BLKSIZE
TFTP block size. See \fICURLOPT_TFTP_BLKSIZE(3)\fP
.IP CURLOPT_TFTP_NO_OPTIONS
Do not send TFTP options requests. See \fICURLOPT_TFTP_NO_OPTIONS(3)\fP
.SH FTP OPTIONS
.IP CURLOPT_FTPPORT
Use active FTP. See \fICURLOPT_FTPPORT(3)\fP
.IP CURLOPT_QUOTE
Commands to run before transfer. See \fICURLOPT_QUOTE(3)\fP
.IP CURLOPT_POSTQUOTE
Commands to run after transfer. See \fICURLOPT_POSTQUOTE(3)\fP
.IP CURLOPT_PREQUOTE
Commands to run just before transfer. See \fICURLOPT_PREQUOTE(3)\fP
.IP CURLOPT_APPEND
Append to remote file. See \fICURLOPT_APPEND(3)\fP
.IP CURLOPT_FTP_USE_EPRT
Use EPTR. See \fICURLOPT_FTP_USE_EPRT(3)\fP
.IP CURLOPT_FTP_USE_EPSV
Use EPSV. See \fICURLOPT_FTP_USE_EPSV(3)\fP
.IP CURLOPT_FTP_USE_PRET
Use PRET. See \fICURLOPT_FTP_USE_PRET(3)\fP
.IP CURLOPT_FTP_CREATE_MISSING_DIRS
Create missing directories on the remote server. See \fICURLOPT_FTP_CREATE_MISSING_DIRS(3)\fP
.IP CURLOPT_FTP_RESPONSE_TIMEOUT
Timeout for FTP responses. See \fICURLOPT_FTP_RESPONSE_TIMEOUT(3)\fP
.IP CURLOPT_FTP_ALTERNATIVE_TO_USER
Alternative to USER. See \fICURLOPT_FTP_ALTERNATIVE_TO_USER(3)\fP
.IP CURLOPT_FTP_SKIP_PASV_IP
Ignore the IP address in the PASV response. See \fICURLOPT_FTP_SKIP_PASV_IP(3)\fP
.IP CURLOPT_FTPSSLAUTH
Control how to do TLS. See \fICURLOPT_FTPSSLAUTH(3)\fP
.IP CURLOPT_FTP_SSL_CCC
Back to non-TLS again after authentication. See \fICURLOPT_FTP_SSL_CCC(3)\fP
.IP CURLOPT_FTP_ACCOUNT
Send ACCT command. See \fICURLOPT_FTP_ACCOUNT(3)\fP
.IP CURLOPT_FTP_FILEMETHOD
Specify how to reach files. See \fICURLOPT_FTP_FILEMETHOD(3)\fP
.SH RTSP OPTIONS
.IP CURLOPT_RTSP_REQUEST
RTSP request. See \fICURLOPT_RTSP_REQUEST(3)\fP
.IP CURLOPT_RTSP_SESSION_ID
RTSP session-id. See \fICURLOPT_RTSP_SESSION_ID(3)\fP
.IP CURLOPT_RTSP_STREAM_URI
RTSP stream URI. See \fICURLOPT_RTSP_STREAM_URI(3)\fP
.IP CURLOPT_RTSP_TRANSPORT
RTSP Transport: header. See \fICURLOPT_RTSP_TRANSPORT(3)\fP
.IP CURLOPT_RTSP_CLIENT_CSEQ
Client CSEQ number. See \fICURLOPT_RTSP_CLIENT_CSEQ(3)\fP
.IP CURLOPT_RTSP_SERVER_CSEQ
CSEQ number for RTSP Server->Client request. See \fICURLOPT_RTSP_SERVER_CSEQ(3)\fP
.SH PROTOCOL OPTIONS
.IP CURLOPT_TRANSFERTEXT
Use text transfer. See \fICURLOPT_TRANSFERTEXT(3)\fP
.IP CURLOPT_PROXY_TRANSFER_MODE
Add transfer mode to URL over proxy. See \fICURLOPT_PROXY_TRANSFER_MODE(3)\fP
.IP CURLOPT_CRLF
Convert newlines. See \fICURLOPT_CRLF(3)\fP
.IP CURLOPT_RANGE
Range requests. See \fICURLOPT_RANGE(3)\fP
.IP CURLOPT_RESUME_FROM
Resume a transfer. See \fICURLOPT_RESUME_FROM(3)\fP
.IP CURLOPT_RESUME_FROM_LARGE
Resume a transfer. See \fICURLOPT_RESUME_FROM_LARGE(3)\fP
.IP CURLOPT_CURLU
Set URL to work on with CURLU *. See \fICURLOPT_CURLU(3)\fP
.IP CURLOPT_CUSTOMREQUEST
Custom request/method. See \fICURLOPT_CUSTOMREQUEST(3)\fP
.IP CURLOPT_FILETIME
Request file modification date and time. See \fICURLOPT_FILETIME(3)\fP
.IP CURLOPT_DIRLISTONLY
List only. See \fICURLOPT_DIRLISTONLY(3)\fP
.IP CURLOPT_NOBODY
Do not get the body contents. See \fICURLOPT_NOBODY(3)\fP
.IP CURLOPT_INFILESIZE
Size of file to send. \fICURLOPT_INFILESIZE(3)\fP
.IP CURLOPT_INFILESIZE_LARGE
Size of file to send. \fICURLOPT_INFILESIZE_LARGE(3)\fP
.IP CURLOPT_UPLOAD
Upload data. See \fICURLOPT_UPLOAD(3)\fP
.IP CURLOPT_UPLOAD_BUFFERSIZE
Set upload buffer size. See \fICURLOPT_UPLOAD_BUFFERSIZE(3)\fP
.IP CURLOPT_MIMEPOST
Post/send MIME data. See \fICURLOPT_MIMEPOST(3)\fP
.IP CURLOPT_MAXFILESIZE
Maximum file size to get. See \fICURLOPT_MAXFILESIZE(3)\fP
.IP CURLOPT_MAXFILESIZE_LARGE
Maximum file size to get. See \fICURLOPT_MAXFILESIZE_LARGE(3)\fP
.IP CURLOPT_TIMECONDITION
Make a time conditional request. See \fICURLOPT_TIMECONDITION(3)\fP
.IP CURLOPT_TIMEVALUE
Time value for the time conditional request. See \fICURLOPT_TIMEVALUE(3)\fP
.IP CURLOPT_TIMEVALUE_LARGE
Time value for the time conditional request. See \fICURLOPT_TIMEVALUE_LARGE(3)\fP
.SH CONNECTION OPTIONS
.IP CURLOPT_TIMEOUT
Timeout for the entire request. See \fICURLOPT_TIMEOUT(3)\fP
.IP CURLOPT_TIMEOUT_MS
Millisecond timeout for the entire request. See \fICURLOPT_TIMEOUT_MS(3)\fP
.IP CURLOPT_LOW_SPEED_LIMIT
Low speed limit to abort transfer. See \fICURLOPT_LOW_SPEED_LIMIT(3)\fP
.IP CURLOPT_LOW_SPEED_TIME
Time to be below the speed to trigger low speed abort. See \fICURLOPT_LOW_SPEED_TIME(3)\fP
.IP CURLOPT_MAX_SEND_SPEED_LARGE
Cap the upload speed to this. See \fICURLOPT_MAX_SEND_SPEED_LARGE(3)\fP
.IP CURLOPT_MAX_RECV_SPEED_LARGE
Cap the download speed to this. See \fICURLOPT_MAX_RECV_SPEED_LARGE(3)\fP
.IP CURLOPT_MAXCONNECTS
Maximum number of connections in the connection pool. See \fICURLOPT_MAXCONNECTS(3)\fP
.IP CURLOPT_FRESH_CONNECT
Use a new connection. \fICURLOPT_FRESH_CONNECT(3)\fP
.IP CURLOPT_FORBID_REUSE
Prevent subsequent connections from re-using this. See \fICURLOPT_FORBID_REUSE(3)\fP
.IP CURLOPT_CONNECTTIMEOUT
Timeout for the connection phase. See \fICURLOPT_CONNECTTIMEOUT(3)\fP
.IP CURLOPT_CONNECTTIMEOUT_MS
Millisecond timeout for the connection phase. See \fICURLOPT_CONNECTTIMEOUT_MS(3)\fP
.IP CURLOPT_IPRESOLVE
IP version to resolve to. See \fICURLOPT_IPRESOLVE(3)\fP
.IP CURLOPT_CONNECT_ONLY
Only connect, nothing else. See \fICURLOPT_CONNECT_ONLY(3)\fP
.IP CURLOPT_USE_SSL
Use TLS/SSL. See \fICURLOPT_USE_SSL(3)\fP
.IP CURLOPT_RESOLVE
Provide fixed/fake name resolves. See \fICURLOPT_RESOLVE(3)\fP
.IP CURLOPT_DNS_INTERFACE
Bind name resolves to this interface. See \fICURLOPT_DNS_INTERFACE(3)\fP
.IP CURLOPT_DNS_LOCAL_IP4
Bind name resolves to this IP4 address. See \fICURLOPT_DNS_LOCAL_IP4(3)\fP
.IP CURLOPT_DNS_LOCAL_IP6
Bind name resolves to this IP6 address. See \fICURLOPT_DNS_LOCAL_IP6(3)\fP
.IP CURLOPT_DNS_SERVERS
Preferred DNS servers. See \fICURLOPT_DNS_SERVERS(3)\fP
.IP CURLOPT_DNS_SHUFFLE_ADDRESSES
Shuffle addresses before use. See \fICURLOPT_DNS_SHUFFLE_ADDRESSES(3)\fP
.IP CURLOPT_ACCEPTTIMEOUT_MS
Timeout for waiting for the server's connect back to be accepted. See \fICURLOPT_ACCEPTTIMEOUT_MS(3)\fP
.IP CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS
Timeout for happy eyeballs. See \fICURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS(3)\fP
.IP CURLOPT_UPKEEP_INTERVAL_MS
Sets the interval at which connection upkeep are performed. See
\fICURLOPT_UPKEEP_INTERVAL_MS(3)\fP
.SH SSL and SECURITY OPTIONS
.IP CURLOPT_SSLCERT
Client cert. See \fICURLOPT_SSLCERT(3)\fP
.IP CURLOPT_PROXY_SSLCERT
Proxy client cert. See \fICURLOPT_PROXY_SSLCERT(3)\fP
.IP CURLOPT_SSLCERTTYPE
Client cert type.  See \fICURLOPT_SSLCERTTYPE(3)\fP
.IP CURLOPT_PROXY_SSLCERTTYPE
Proxy client cert type.  See \fICURLOPT_PROXY_SSLCERTTYPE(3)\fP
.IP CURLOPT_SSLKEY
Client key. See \fICURLOPT_SSLKEY(3)\fP
.IP CURLOPT_PROXY_SSLKEY
Proxy client key. See \fICURLOPT_PROXY_SSLKEY(3)\fP
.IP CURLOPT_SSLKEYTYPE
Client key type. See \fICURLOPT_SSLKEYTYPE(3)\fP
.IP CURLOPT_PROXY_SSLKEYTYPE
Proxy client key type. See \fICURLOPT_PROXY_SSLKEYTYPE(3)\fP
.IP CURLOPT_KEYPASSWD
Client key password. See \fICURLOPT_KEYPASSWD(3)\fP
.IP CURLOPT_PROXY_KEYPASSWD
Proxy client key password. See \fICURLOPT_PROXY_KEYPASSWD(3)\fP
.IP CURLOPT_SSL_ENABLE_ALPN
Enable use of ALPN. See \fICURLOPT_SSL_ENABLE_ALPN(3)\fP
.IP CURLOPT_SSL_ENABLE_NPN
Enable use of NPN. See \fICURLOPT_SSL_ENABLE_NPN(3)\fP
.IP CURLOPT_SSLENGINE
Use identifier with SSL engine. See \fICURLOPT_SSLENGINE(3)\fP
.IP CURLOPT_SSLENGINE_DEFAULT
Default SSL engine. See \fICURLOPT_SSLENGINE_DEFAULT(3)\fP
.IP CURLOPT_SSL_FALSESTART
Enable TLS False Start. See \fICURLOPT_SSL_FALSESTART(3)\fP
.IP CURLOPT_SSLVERSION
SSL version to use. See \fICURLOPT_SSLVERSION(3)\fP
.IP CURLOPT_PROXY_SSLVERSION
Proxy SSL version to use. See \fICURLOPT_PROXY_SSLVERSION(3)\fP
.IP CURLOPT_SSL_VERIFYHOST
Verify the host name in the SSL certificate. See \fICURLOPT_SSL_VERIFYHOST(3)\fP
.IP CURLOPT_PROXY_SSL_VERIFYHOST
Verify the host name in the proxy SSL certificate. See \fICURLOPT_PROXY_SSL_VERIFYHOST(3)\fP
.IP CURLOPT_SSL_VERIFYPEER
Verify the SSL certificate. See \fICURLOPT_SSL_VERIFYPEER(3)\fP
.IP CURLOPT_PROXY_SSL_VERIFYPEER
Verify the proxy SSL certificate. See \fICURLOPT_PROXY_SSL_VERIFYPEER(3)\fP
.IP CURLOPT_SSL_VERIFYSTATUS
Verify the SSL certificate's status. See \fICURLOPT_SSL_VERIFYSTATUS(3)\fP
.IP CURLOPT_CAINFO
CA cert bundle. See \fICURLOPT_CAINFO(3)\fP
.IP CURLOPT_PROXY_CAINFO
Proxy CA cert bundle. See \fICURLOPT_PROXY_CAINFO(3)\fP
.IP CURLOPT_ISSUERCERT
Issuer certificate. See \fICURLOPT_ISSUERCERT(3)\fP
.IP CURLOPT_CAPATH
Path to CA cert bundle. See \fICURLOPT_CAPATH(3)\fP
.IP CURLOPT_PROXY_CAPATH
Path to proxy CA cert bundle. See \fICURLOPT_PROXY_CAPATH(3)\fP
.IP CURLOPT_CRLFILE
Certificate Revocation List. See \fICURLOPT_CRLFILE(3)\fP
.IP CURLOPT_PROXY_CRLFILE
Proxy Certificate Revocation List. See \fICURLOPT_PROXY_CRLFILE(3)\fP
.IP CURLOPT_CERTINFO
Extract certificate info. See \fICURLOPT_CERTINFO(3)\fP
.IP CURLOPT_PINNEDPUBLICKEY
Set pinned SSL public key . See \fICURLOPT_PINNEDPUBLICKEY(3)\fP
.IP CURLOPT_PROXY_PINNEDPUBLICKEY
Set the proxy's pinned SSL public key. See
\fICURLOPT_PROXY_PINNEDPUBLICKEY(3)\fP
.IP CURLOPT_RANDOM_FILE
Provide source for entropy random data. See \fICURLOPT_RANDOM_FILE(3)\fP
.IP CURLOPT_EGDSOCKET
Identify EGD socket for entropy. See \fICURLOPT_EGDSOCKET(3)\fP
.IP CURLOPT_SSL_CIPHER_LIST
Ciphers to use. See \fICURLOPT_SSL_CIPHER_LIST(3)\fP
.IP CURLOPT_PROXY_SSL_CIPHER_LIST
Proxy ciphers to use. See \fICURLOPT_PROXY_SSL_CIPHER_LIST(3)\fP
.IP CURLOPT_TLS13_CIPHERS
TLS 1.3 cipher suites to use. See \fICURLOPT_TLS13_CIPHERS(3)\fP
.IP CURLOPT_PROXY_TLS13_CIPHERS
Proxy TLS 1.3 cipher suites to use. See \fICURLOPT_PROXY_TLS13_CIPHERS(3)\fP
.IP CURLOPT_SSL_SESSIONID_CACHE
Disable SSL session-id cache. See \fICURLOPT_SSL_SESSIONID_CACHE(3)\fP
.IP CURLOPT_SSL_OPTIONS
Control SSL behavior. See \fICURLOPT_SSL_OPTIONS(3)\fP
.IP CURLOPT_PROXY_SSL_OPTIONS
Control proxy SSL behavior. See \fICURLOPT_PROXY_SSL_OPTIONS(3)\fP
.IP CURLOPT_KRBLEVEL
Kerberos security level. See \fICURLOPT_KRBLEVEL(3)\fP
.IP CURLOPT_GSSAPI_DELEGATION
Disable GSS-API delegation. See \fICURLOPT_GSSAPI_DELEGATION(3)\fP
.SH SSH OPTIONS
.IP CURLOPT_SSH_AUTH_TYPES
SSH authentication types. See \fICURLOPT_SSH_AUTH_TYPES(3)\fP
.IP CURLOPT_SSH_COMPRESSION
Enable SSH compression. See \fICURLOPT_SSH_COMPRESSION(3)\fP
.IP CURLOPT_SSH_HOST_PUBLIC_KEY_MD5
MD5 of host's public key. See \fICURLOPT_SSH_HOST_PUBLIC_KEY_MD5(3)\fP
.IP CURLOPT_SSH_PUBLIC_KEYFILE
File name of public key. See \fICURLOPT_SSH_PUBLIC_KEYFILE(3)\fP
.IP CURLOPT_SSH_PRIVATE_KEYFILE
File name of private key. See \fICURLOPT_SSH_PRIVATE_KEYFILE(3)\fP
.IP CURLOPT_SSH_KNOWNHOSTS
File name with known hosts. See \fICURLOPT_SSH_KNOWNHOSTS(3)\fP
.IP CURLOPT_SSH_KEYFUNCTION
Callback for known hosts handling. See \fICURLOPT_SSH_KEYFUNCTION(3)\fP
.IP CURLOPT_SSH_KEYDATA
Custom pointer to pass to ssh key callback. See \fICURLOPT_SSH_KEYDATA(3)\fP
.SH OTHER OPTIONS
.IP CURLOPT_PRIVATE
Private pointer to store. See \fICURLOPT_PRIVATE(3)\fP
.IP CURLOPT_SHARE
Share object to use. See \fICURLOPT_SHARE(3)\fP
.IP CURLOPT_NEW_FILE_PERMS
Mode for creating new remote files. See \fICURLOPT_NEW_FILE_PERMS(3)\fP
.IP CURLOPT_NEW_DIRECTORY_PERMS
Mode for creating new remote directories. See \fICURLOPT_NEW_DIRECTORY_PERMS(3)\fP
.SH TELNET OPTIONS
.IP CURLOPT_TELNETOPTIONS
TELNET options. See \fICURLOPT_TELNETOPTIONS(3)\fP
.SH RETURN VALUE
\fICURLE_OK\fP (zero) means that the option was set properly, non-zero means an
error occurred as \fI<curl/curl.h>\fP defines. See the \fIlibcurl-errors(3)\fP
man page for the full list with descriptions.

If you try to set an option that libcurl doesn't know about, perhaps because
the library is too old to support it or the option was removed in a recent
version, this function will return \fICURLE_UNKNOWN_OPTION\fP. If support for
the option was disabled at compile-time, it will return
\fICURLE_NOT_BUILT_IN\fP.
.SH EXAMPLE
.nf
CURL *curl = curl_easy_init();
if(curl) {
  CURLcode res;
  curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
  res = curl_easy_perform(curl);
  curl_easy_cleanup(curl);
}
.fi
.SH "SEE ALSO"
.BR curl_easy_init "(3), " curl_easy_cleanup "(3), " curl_easy_reset "(3), "
.BR curl_easy_getinfo "(3), " curl_multi_setopt "(3), "