1--- 2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3SPDX-License-Identifier: curl 4Title: curl_easy_setopt 5Section: 3 6Source: libcurl 7See-also: 8 - curl_easy_cleanup (3) 9 - curl_easy_getinfo (3) 10 - curl_easy_init (3) 11 - curl_easy_option_by_id (3) 12 - curl_easy_option_by_name (3) 13 - curl_easy_option_next (3) 14 - curl_easy_reset (3) 15 - curl_multi_setopt (3) 16Protocol: 17 - All 18Added-in: 7.1 19--- 20 21# NAME 22 23curl_easy_setopt - set options for a curl easy handle 24 25# SYNOPSIS 26 27~~~c 28#include <curl/curl.h> 29 30CURLcode curl_easy_setopt(CURL *handle, CURLoption option, parameter); 31~~~ 32 33# DESCRIPTION 34 35curl_easy_setopt(3) is used to tell libcurl how to behave. By setting the 36appropriate options, the application can change libcurl's behavior. All 37options are set with an *option* followed by a *parameter*. That parameter can 38be a **long**, a **function pointer**, an **object pointer** or a 39**curl_off_t**, depending on what the specific option expects. Read this 40manual carefully as bad input values may cause libcurl to behave badly! You 41can only set one option in each function call. A typical application uses many 42curl_easy_setopt(3) calls in the setup phase. 43 44Options set with this function call are valid for all forthcoming transfers 45performed using this *handle*. The options are not in any way reset between 46transfers, so if you want subsequent transfers with different options, you 47must change them between the transfers. You can optionally reset all options 48back to internal default with curl_easy_reset(3). 49 50Strings passed to libcurl as 'char *' arguments, are copied by the library; 51the string storage associated to the pointer argument may be discarded or 52reused after curl_easy_setopt(3) returns. The only exception to this rule is 53really CURLOPT_POSTFIELDS(3), but the alternative that copies the string 54CURLOPT_COPYPOSTFIELDS(3) has some usage characteristics you need to read up 55on. This function does not accept input strings longer than 56**CURL_MAX_INPUT_LENGTH** (8 MB). 57 58The order in which the options are set does not matter. 59 60Before version 7.17.0, strings were not copied. Instead the user was forced 61keep them available until libcurl no longer needed them. 62 63The *handle* is the return code from a curl_easy_init(3) or 64curl_easy_duphandle(3) call. 65 66# OPTIONS 67 68## CURLOPT_ABSTRACT_UNIX_SOCKET 69 70Path to an abstract Unix domain socket. See CURLOPT_ABSTRACT_UNIX_SOCKET(3) 71 72## CURLOPT_ACCEPTTIMEOUT_MS 73 74Timeout for waiting for the server's connect back to be accepted. See 75CURLOPT_ACCEPTTIMEOUT_MS(3) 76 77## CURLOPT_ACCEPT_ENCODING 78 79Accept-Encoding and automatic decompressing data. See 80CURLOPT_ACCEPT_ENCODING(3) 81 82## CURLOPT_ADDRESS_SCOPE 83 84IPv6 scope for local addresses. See CURLOPT_ADDRESS_SCOPE(3) 85 86## CURLOPT_ALTSVC 87 88Specify the Alt-Svc: cache filename. See CURLOPT_ALTSVC(3) 89 90## CURLOPT_ALTSVC_CTRL 91 92Enable and configure Alt-Svc: treatment. See CURLOPT_ALTSVC_CTRL(3) 93 94## CURLOPT_APPEND 95 96Append to remote file. See CURLOPT_APPEND(3) 97 98## CURLOPT_AUTOREFERER 99 100Automatically set Referer: header. See CURLOPT_AUTOREFERER(3) 101 102## CURLOPT_AWS_SIGV4 103 104AWS HTTP V4 Signature. See CURLOPT_AWS_SIGV4(3) 105 106## CURLOPT_BUFFERSIZE 107 108Ask for alternate buffer size. See CURLOPT_BUFFERSIZE(3) 109 110## CURLOPT_CAINFO 111 112CA cert bundle. See CURLOPT_CAINFO(3) 113 114## CURLOPT_CAINFO_BLOB 115 116CA cert bundle memory buffer. See CURLOPT_CAINFO_BLOB(3) 117 118## CURLOPT_CAPATH 119 120Path to CA cert bundle. See CURLOPT_CAPATH(3) 121 122## CURLOPT_CA_CACHE_TIMEOUT 123 124Timeout for CA cache. See CURLOPT_CA_CACHE_TIMEOUT(3) 125 126## CURLOPT_CERTINFO 127 128Extract certificate info. See CURLOPT_CERTINFO(3) 129 130## CURLOPT_CHUNK_BGN_FUNCTION 131 132Callback for wildcard download start of chunk. See 133CURLOPT_CHUNK_BGN_FUNCTION(3) 134 135## CURLOPT_CHUNK_DATA 136 137Data pointer to pass to the chunk callbacks. See CURLOPT_CHUNK_DATA(3) 138 139## CURLOPT_CHUNK_END_FUNCTION 140 141Callback for wildcard download end of chunk. See CURLOPT_CHUNK_END_FUNCTION(3) 142 143## CURLOPT_CLOSESOCKETDATA 144 145Data pointer to pass to the close socket callback. See 146CURLOPT_CLOSESOCKETDATA(3) 147 148## CURLOPT_CLOSESOCKETFUNCTION 149 150Callback for closing socket. See CURLOPT_CLOSESOCKETFUNCTION(3) 151 152## CURLOPT_CONNECTTIMEOUT 153 154Timeout for the connection phase. See CURLOPT_CONNECTTIMEOUT(3) 155 156## CURLOPT_CONNECTTIMEOUT_MS 157 158Millisecond timeout for the connection phase. See CURLOPT_CONNECTTIMEOUT_MS(3) 159 160## CURLOPT_CONNECT_ONLY 161 162Only connect, nothing else. See CURLOPT_CONNECT_ONLY(3) 163 164## CURLOPT_CONNECT_TO 165 166Connect to a specific host and port. See CURLOPT_CONNECT_TO(3) 167 168## CURLOPT_CONV_FROM_NETWORK_FUNCTION 169 170**OBSOLETE** Callback for code base conversion. 171See CURLOPT_CONV_FROM_NETWORK_FUNCTION(3) 172 173## CURLOPT_CONV_FROM_UTF8_FUNCTION 174 175**OBSOLETE** Callback for code base conversion. 176See CURLOPT_CONV_FROM_UTF8_FUNCTION(3) 177 178## CURLOPT_CONV_TO_NETWORK_FUNCTION 179 180**OBSOLETE** Callback for code base conversion. 181See CURLOPT_CONV_TO_NETWORK_FUNCTION(3) 182 183## CURLOPT_COOKIE 184 185Cookie(s) to send. See CURLOPT_COOKIE(3) 186 187## CURLOPT_COOKIEFILE 188 189File to read cookies from. See CURLOPT_COOKIEFILE(3) 190 191## CURLOPT_COOKIEJAR 192 193File to write cookies to. See CURLOPT_COOKIEJAR(3) 194 195## CURLOPT_COOKIELIST 196 197Add or control cookies. See CURLOPT_COOKIELIST(3) 198 199## CURLOPT_COOKIESESSION 200 201Start a new cookie session. See CURLOPT_COOKIESESSION(3) 202 203## CURLOPT_COPYPOSTFIELDS 204 205Send a POST with this data - and copy it. See CURLOPT_COPYPOSTFIELDS(3) 206 207## CURLOPT_CRLF 208 209Convert newlines. See CURLOPT_CRLF(3) 210 211## CURLOPT_CRLFILE 212 213Certificate Revocation List. See CURLOPT_CRLFILE(3) 214 215## CURLOPT_CURLU 216 217Set URL to work on with a URL handle. See CURLOPT_CURLU(3) 218 219## CURLOPT_CUSTOMREQUEST 220 221Custom request/method. See CURLOPT_CUSTOMREQUEST(3) 222 223## CURLOPT_DEBUGDATA 224 225Data pointer to pass to the debug callback. See CURLOPT_DEBUGDATA(3) 226 227## CURLOPT_DEBUGFUNCTION 228 229Callback for debug information. See CURLOPT_DEBUGFUNCTION(3) 230 231## CURLOPT_DEFAULT_PROTOCOL 232 233Default protocol. See CURLOPT_DEFAULT_PROTOCOL(3) 234 235## CURLOPT_DIRLISTONLY 236 237List only. See CURLOPT_DIRLISTONLY(3) 238 239## CURLOPT_DISALLOW_USERNAME_IN_URL 240 241Do not allow username in URL. See CURLOPT_DISALLOW_USERNAME_IN_URL(3) 242 243## CURLOPT_DNS_CACHE_TIMEOUT 244 245Timeout for DNS cache. See CURLOPT_DNS_CACHE_TIMEOUT(3) 246 247## CURLOPT_DNS_INTERFACE 248 249Bind name resolves to this interface. See CURLOPT_DNS_INTERFACE(3) 250 251## CURLOPT_DNS_LOCAL_IP4 252 253Bind name resolves to this IP4 address. See CURLOPT_DNS_LOCAL_IP4(3) 254 255## CURLOPT_DNS_LOCAL_IP6 256 257Bind name resolves to this IP6 address. See CURLOPT_DNS_LOCAL_IP6(3) 258 259## CURLOPT_DNS_SERVERS 260 261Preferred DNS servers. See CURLOPT_DNS_SERVERS(3) 262 263## CURLOPT_DNS_SHUFFLE_ADDRESSES 264 265Shuffle addresses before use. See CURLOPT_DNS_SHUFFLE_ADDRESSES(3) 266 267## CURLOPT_DNS_USE_GLOBAL_CACHE 268 269**OBSOLETE** Enable global DNS cache. See CURLOPT_DNS_USE_GLOBAL_CACHE(3) 270 271## CURLOPT_DOH_SSL_VERIFYHOST 272 273Verify the hostname in the DoH (DNS-over-HTTPS) SSL certificate. See 274CURLOPT_DOH_SSL_VERIFYHOST(3) 275 276## CURLOPT_DOH_SSL_VERIFYPEER 277 278Verify the DoH (DNS-over-HTTPS) SSL certificate. See 279CURLOPT_DOH_SSL_VERIFYPEER(3) 280 281## CURLOPT_DOH_SSL_VERIFYSTATUS 282 283Verify the DoH (DNS-over-HTTPS) SSL certificate's status. See 284CURLOPT_DOH_SSL_VERIFYSTATUS(3) 285 286## CURLOPT_DOH_URL 287 288Use this DoH server for name resolves. See CURLOPT_DOH_URL(3) 289 290## CURLOPT_ECH 291 292Set the configuration for ECH. See CURLOPT_ECH(3) 293 294## CURLOPT_EGDSOCKET 295 296**OBSOLETE** Identify EGD socket for entropy. See CURLOPT_EGDSOCKET(3) 297 298## CURLOPT_ERRORBUFFER 299 300Error message buffer. See CURLOPT_ERRORBUFFER(3) 301 302## CURLOPT_EXPECT_100_TIMEOUT_MS 303 304100-continue timeout. See CURLOPT_EXPECT_100_TIMEOUT_MS(3) 305 306## CURLOPT_FAILONERROR 307 308Fail on HTTP 4xx errors. CURLOPT_FAILONERROR(3) 309 310## CURLOPT_FILETIME 311 312Request file modification date and time. See CURLOPT_FILETIME(3) 313 314## CURLOPT_FNMATCH_DATA 315 316Data pointer to pass to the wildcard matching callback. See 317CURLOPT_FNMATCH_DATA(3) 318 319## CURLOPT_FNMATCH_FUNCTION 320 321Callback for wildcard matching. See CURLOPT_FNMATCH_FUNCTION(3) 322 323## CURLOPT_FOLLOWLOCATION 324 325Follow HTTP redirects. See CURLOPT_FOLLOWLOCATION(3) 326 327## CURLOPT_FORBID_REUSE 328 329Prevent subsequent connections from reusing this. See CURLOPT_FORBID_REUSE(3) 330 331## CURLOPT_FRESH_CONNECT 332 333Use a new connection. CURLOPT_FRESH_CONNECT(3) 334 335## CURLOPT_FTPPORT 336 337Use active FTP. See CURLOPT_FTPPORT(3) 338 339## CURLOPT_FTPSSLAUTH 340 341Control how to do TLS. See CURLOPT_FTPSSLAUTH(3) 342 343## CURLOPT_FTP_ACCOUNT 344 345Send ACCT command. See CURLOPT_FTP_ACCOUNT(3) 346 347## CURLOPT_FTP_ALTERNATIVE_TO_USER 348 349Alternative to USER. See CURLOPT_FTP_ALTERNATIVE_TO_USER(3) 350 351## CURLOPT_FTP_CREATE_MISSING_DIRS 352 353Create missing directories on the remote server. See 354CURLOPT_FTP_CREATE_MISSING_DIRS(3) 355 356## CURLOPT_FTP_FILEMETHOD 357 358Specify how to reach files. See CURLOPT_FTP_FILEMETHOD(3) 359 360## CURLOPT_FTP_SKIP_PASV_IP 361 362Ignore the IP address in the PASV response. See CURLOPT_FTP_SKIP_PASV_IP(3) 363 364## CURLOPT_FTP_SSL_CCC 365 366Back to non-TLS again after authentication. See CURLOPT_FTP_SSL_CCC(3) 367 368## CURLOPT_FTP_USE_EPRT 369 370Use EPRT. See CURLOPT_FTP_USE_EPRT(3) 371 372## CURLOPT_FTP_USE_EPSV 373 374Use EPSV. See CURLOPT_FTP_USE_EPSV(3) 375 376## CURLOPT_FTP_USE_PRET 377 378Use PRET. See CURLOPT_FTP_USE_PRET(3) 379 380## CURLOPT_GSSAPI_DELEGATION 381 382Disable GSS-API delegation. See CURLOPT_GSSAPI_DELEGATION(3) 383 384## CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS 385 386Timeout for happy eyeballs. See CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS(3) 387 388## CURLOPT_HAPROXYPROTOCOL 389 390Send an HAProxy PROXY protocol v1 header. See CURLOPT_HAPROXYPROTOCOL(3) 391 392## CURLOPT_HAPROXY_CLIENT_IP 393 394Spoof the client IP in an HAProxy PROXY protocol v1 header. See 395CURLOPT_HAPROXY_CLIENT_IP(3) 396 397## CURLOPT_HEADER 398 399Include the header in the body output. See CURLOPT_HEADER(3) 400 401## CURLOPT_HEADERDATA 402 403Data pointer to pass to the header callback. See CURLOPT_HEADERDATA(3) 404 405## CURLOPT_HEADERFUNCTION 406 407Callback for writing received headers. See CURLOPT_HEADERFUNCTION(3) 408 409## CURLOPT_HEADEROPT 410 411Control custom headers. See CURLOPT_HEADEROPT(3) 412 413## CURLOPT_HSTS 414 415Set HSTS cache file. See CURLOPT_HSTS(3) 416 417## CURLOPT_HSTSREADDATA 418 419Pass pointer to the HSTS read callback. See CURLOPT_HSTSREADDATA(3) 420 421## CURLOPT_HSTSREADFUNCTION 422 423Set HSTS read callback. See CURLOPT_HSTSREADFUNCTION(3) 424 425## CURLOPT_HSTSWRITEDATA 426 427Pass pointer to the HSTS write callback. See CURLOPT_HSTSWRITEDATA(3) 428 429## CURLOPT_HSTSWRITEFUNCTION 430 431Set HSTS write callback. See CURLOPT_HSTSWRITEFUNCTION(3) 432 433## CURLOPT_HSTS_CTRL 434 435Enable HSTS. See CURLOPT_HSTS_CTRL(3) 436 437## CURLOPT_HTTP09_ALLOWED 438 439Allow HTTP/0.9 responses. CURLOPT_HTTP09_ALLOWED(3) 440 441## CURLOPT_HTTP200ALIASES 442 443Alternative versions of 200 OK. See CURLOPT_HTTP200ALIASES(3) 444 445## CURLOPT_HTTPAUTH 446 447HTTP server authentication methods. See CURLOPT_HTTPAUTH(3) 448 449## CURLOPT_HTTPGET 450 451Do an HTTP GET request. See CURLOPT_HTTPGET(3) 452 453## CURLOPT_HTTPHEADER 454 455Custom HTTP headers. See CURLOPT_HTTPHEADER(3) 456 457## CURLOPT_HTTPPOST 458 459**Deprecated option** Multipart formpost HTTP POST. 460See CURLOPT_HTTPPOST(3) 461 462## CURLOPT_HTTPPROXYTUNNEL 463 464Tunnel through the HTTP proxy. CURLOPT_HTTPPROXYTUNNEL(3) 465 466## CURLOPT_HTTP_CONTENT_DECODING 467 468Disable Content decoding. See CURLOPT_HTTP_CONTENT_DECODING(3) 469 470## CURLOPT_HTTP_TRANSFER_DECODING 471 472Disable Transfer decoding. See CURLOPT_HTTP_TRANSFER_DECODING(3) 473 474## CURLOPT_HTTP_VERSION 475 476HTTP version to use. CURLOPT_HTTP_VERSION(3) 477 478## CURLOPT_IGNORE_CONTENT_LENGTH 479 480Ignore Content-Length. See CURLOPT_IGNORE_CONTENT_LENGTH(3) 481 482## CURLOPT_INFILESIZE 483 484Size of file to send. CURLOPT_INFILESIZE(3) 485 486## CURLOPT_INFILESIZE_LARGE 487 488Size of file to send. CURLOPT_INFILESIZE_LARGE(3) 489 490## CURLOPT_INTERFACE 491 492Bind connection locally to this. See CURLOPT_INTERFACE(3) 493 494## CURLOPT_INTERLEAVEDATA 495 496Data pointer to pass to the RTSP interleave callback. See 497CURLOPT_INTERLEAVEDATA(3) 498 499## CURLOPT_INTERLEAVEFUNCTION 500 501Callback for RTSP interleaved data. See CURLOPT_INTERLEAVEFUNCTION(3) 502 503## CURLOPT_IOCTLDATA 504 505**Deprecated option** Data pointer to pass to the I/O callback. 506See CURLOPT_IOCTLDATA(3) 507 508## CURLOPT_IOCTLFUNCTION 509 510**Deprecated option** Callback for I/O operations. 511See CURLOPT_IOCTLFUNCTION(3) 512 513## CURLOPT_IPRESOLVE 514 515IP version to use. See CURLOPT_IPRESOLVE(3) 516 517## CURLOPT_ISSUERCERT 518 519Issuer certificate. See CURLOPT_ISSUERCERT(3) 520 521## CURLOPT_ISSUERCERT_BLOB 522 523Issuer certificate memory buffer. See CURLOPT_ISSUERCERT_BLOB(3) 524 525## CURLOPT_KEEP_SENDING_ON_ERROR 526 527Keep sending on HTTP \>= 300 errors. CURLOPT_KEEP_SENDING_ON_ERROR(3) 528 529## CURLOPT_KEYPASSWD 530 531Client key password. See CURLOPT_KEYPASSWD(3) 532 533## CURLOPT_KRBLEVEL 534 535Kerberos security level. See CURLOPT_KRBLEVEL(3) 536 537## CURLOPT_LOCALPORT 538 539Bind connection locally to this port. See CURLOPT_LOCALPORT(3) 540 541## CURLOPT_LOCALPORTRANGE 542 543Bind connection locally to port range. See CURLOPT_LOCALPORTRANGE(3) 544 545## CURLOPT_LOGIN_OPTIONS 546 547Login options. See CURLOPT_LOGIN_OPTIONS(3) 548 549## CURLOPT_LOW_SPEED_LIMIT 550 551Low speed limit to abort transfer. See CURLOPT_LOW_SPEED_LIMIT(3) 552 553## CURLOPT_LOW_SPEED_TIME 554 555Time to be below the speed to trigger low speed abort. See 556CURLOPT_LOW_SPEED_TIME(3) 557 558## CURLOPT_MAIL_AUTH 559 560Authentication address. See CURLOPT_MAIL_AUTH(3) 561 562## CURLOPT_MAIL_FROM 563 564Address of the sender. See CURLOPT_MAIL_FROM(3) 565 566## CURLOPT_MAIL_RCPT 567 568Address of the recipients. See CURLOPT_MAIL_RCPT(3) 569 570## CURLOPT_MAIL_RCPT_ALLOWFAILS 571 572Allow RCPT TO command to fail for some recipients. See 573CURLOPT_MAIL_RCPT_ALLOWFAILS(3) 574 575## CURLOPT_MAXAGE_CONN 576 577Limit the age (idle time) of connections for reuse. See CURLOPT_MAXAGE_CONN(3) 578 579## CURLOPT_MAXCONNECTS 580 581Maximum number of connections in the connection pool. See 582CURLOPT_MAXCONNECTS(3) 583 584## CURLOPT_MAXFILESIZE 585 586Maximum file size to get. See CURLOPT_MAXFILESIZE(3) 587 588## CURLOPT_MAXFILESIZE_LARGE 589 590Maximum file size to get. See CURLOPT_MAXFILESIZE_LARGE(3) 591 592## CURLOPT_MAXLIFETIME_CONN 593 594Limit the age (since creation) of connections for reuse. See 595CURLOPT_MAXLIFETIME_CONN(3) 596 597## CURLOPT_MAXREDIRS 598 599Maximum number of redirects to follow. See CURLOPT_MAXREDIRS(3) 600 601## CURLOPT_MAX_RECV_SPEED_LARGE 602 603Cap the download speed to this. See CURLOPT_MAX_RECV_SPEED_LARGE(3) 604 605## CURLOPT_MAX_SEND_SPEED_LARGE 606 607Cap the upload speed to this. See CURLOPT_MAX_SEND_SPEED_LARGE(3) 608 609## CURLOPT_MIMEPOST 610 611Post/send MIME data. See CURLOPT_MIMEPOST(3) 612 613## CURLOPT_MIME_OPTIONS 614 615Set MIME option flags. See CURLOPT_MIME_OPTIONS(3) 616 617## CURLOPT_NETRC 618 619Enable .netrc parsing. See CURLOPT_NETRC(3) 620 621## CURLOPT_NETRC_FILE 622 623.netrc filename. See CURLOPT_NETRC_FILE(3) 624 625## CURLOPT_NEW_DIRECTORY_PERMS 626 627Mode for creating new remote directories. See CURLOPT_NEW_DIRECTORY_PERMS(3) 628 629## CURLOPT_NEW_FILE_PERMS 630 631Mode for creating new remote files. See CURLOPT_NEW_FILE_PERMS(3) 632 633## CURLOPT_NOBODY 634 635Do not get the body contents. See CURLOPT_NOBODY(3) 636 637## CURLOPT_NOPROGRESS 638 639Shut off the progress meter. See CURLOPT_NOPROGRESS(3) 640 641## CURLOPT_NOPROXY 642 643Filter out hosts from proxy use. CURLOPT_NOPROXY(3) 644 645## CURLOPT_NOSIGNAL 646 647Do not install signal handlers. See CURLOPT_NOSIGNAL(3) 648 649## CURLOPT_OPENSOCKETDATA 650 651Data pointer to pass to the open socket callback. See CURLOPT_OPENSOCKETDATA(3) 652 653## CURLOPT_OPENSOCKETFUNCTION 654 655Callback for socket creation. See CURLOPT_OPENSOCKETFUNCTION(3) 656 657## CURLOPT_PASSWORD 658 659Password. See CURLOPT_PASSWORD(3) 660 661## CURLOPT_PATH_AS_IS 662 663Disable squashing /../ and /./ sequences in the path. See CURLOPT_PATH_AS_IS(3) 664 665## CURLOPT_PINNEDPUBLICKEY 666 667Set pinned SSL public key . See CURLOPT_PINNEDPUBLICKEY(3) 668 669## CURLOPT_PIPEWAIT 670 671Wait on connection to pipeline on it. See CURLOPT_PIPEWAIT(3) 672 673## CURLOPT_PORT 674 675Port number to connect to. See CURLOPT_PORT(3) 676 677## CURLOPT_POST 678 679Make an HTTP POST. See CURLOPT_POST(3) 680 681## CURLOPT_POSTFIELDSIZE 682 683The POST data is this big. See CURLOPT_POSTFIELDSIZE(3) 684 685## CURLOPT_POSTFIELDSIZE_LARGE 686 687The POST data is this big. See CURLOPT_POSTFIELDSIZE_LARGE(3) 688 689## CURLOPT_POSTQUOTE 690 691Commands to run after transfer. See CURLOPT_POSTQUOTE(3) 692 693## CURLOPT_POSTREDIR 694 695How to act on redirects after POST. See CURLOPT_POSTREDIR(3) 696 697## CURLOPT_PREQUOTE 698 699Commands to run just before transfer. See CURLOPT_PREQUOTE(3) 700 701## CURLOPT_PREREQDATA 702 703Data pointer to pass to the CURLOPT_PREREQFUNCTION callback. See 704CURLOPT_PREREQDATA(3) 705 706## CURLOPT_PREREQFUNCTION 707 708Callback to be called after a connection is established but before a request 709is made on that connection. See CURLOPT_PREREQFUNCTION(3) 710 711## CURLOPT_PRE_PROXY 712 713Socks proxy to use. See CURLOPT_PRE_PROXY(3) 714 715## CURLOPT_PRIVATE 716 717Private pointer to store. See CURLOPT_PRIVATE(3) 718 719## CURLOPT_PROGRESSDATA 720 721Data pointer to pass to the progress meter callback. See 722CURLOPT_PROGRESSDATA(3) 723 724## CURLOPT_PROGRESSFUNCTION 725 726**OBSOLETE** callback for progress meter. See CURLOPT_PROGRESSFUNCTION(3) 727 728## CURLOPT_PROTOCOLS 729 730**Deprecated option** Allowed protocols. See CURLOPT_PROTOCOLS(3) 731 732## CURLOPT_PROTOCOLS_STR 733 734Allowed protocols. See CURLOPT_PROTOCOLS_STR(3) 735 736## CURLOPT_PROXY 737 738Proxy to use. See CURLOPT_PROXY(3) 739 740## CURLOPT_PROXYAUTH 741 742HTTP proxy authentication methods. See CURLOPT_PROXYAUTH(3) 743 744## CURLOPT_PROXYHEADER 745 746Custom HTTP headers sent to proxy. See CURLOPT_PROXYHEADER(3) 747 748## CURLOPT_PROXYPASSWORD 749 750Proxy password. See CURLOPT_PROXYPASSWORD(3) 751 752## CURLOPT_PROXYPORT 753 754Proxy port to use. See CURLOPT_PROXYPORT(3) 755 756## CURLOPT_PROXYTYPE 757 758Proxy type. See CURLOPT_PROXYTYPE(3) 759 760## CURLOPT_PROXYUSERNAME 761Proxy username. See CURLOPT_PROXYUSERNAME(3) 762 763## CURLOPT_PROXYUSERPWD 764 765Proxy username and password. See CURLOPT_PROXYUSERPWD(3) 766 767## CURLOPT_PROXY_CAINFO 768 769Proxy CA cert bundle. See CURLOPT_PROXY_CAINFO(3) 770 771## CURLOPT_PROXY_CAINFO_BLOB 772 773Proxy CA cert bundle memory buffer. See CURLOPT_PROXY_CAINFO_BLOB(3) 774 775## CURLOPT_PROXY_CAPATH 776 777Path to proxy CA cert bundle. See CURLOPT_PROXY_CAPATH(3) 778 779## CURLOPT_PROXY_CRLFILE 780 781Proxy Certificate Revocation List. See CURLOPT_PROXY_CRLFILE(3) 782 783## CURLOPT_PROXY_ISSUERCERT 784 785Proxy issuer certificate. See CURLOPT_PROXY_ISSUERCERT(3) 786 787## CURLOPT_PROXY_ISSUERCERT_BLOB 788 789Proxy issuer certificate memory buffer. See CURLOPT_PROXY_ISSUERCERT_BLOB(3) 790 791## CURLOPT_PROXY_KEYPASSWD 792 793Proxy client key password. See CURLOPT_PROXY_KEYPASSWD(3) 794 795## CURLOPT_PROXY_PINNEDPUBLICKEY 796 797Set the proxy's pinned SSL public key. See 798CURLOPT_PROXY_PINNEDPUBLICKEY(3) 799 800## CURLOPT_PROXY_SERVICE_NAME 801 802Proxy authentication service name. CURLOPT_PROXY_SERVICE_NAME(3) 803 804## CURLOPT_PROXY_SSLCERT 805 806Proxy client cert. See CURLOPT_PROXY_SSLCERT(3) 807 808## CURLOPT_PROXY_SSLCERTTYPE 809 810Proxy client cert type. See CURLOPT_PROXY_SSLCERTTYPE(3) 811 812## CURLOPT_PROXY_SSLCERT_BLOB 813 814Proxy client cert memory buffer. See CURLOPT_PROXY_SSLCERT_BLOB(3) 815 816## CURLOPT_PROXY_SSLKEY 817 818Proxy client key. See CURLOPT_PROXY_SSLKEY(3) 819 820## CURLOPT_PROXY_SSLKEYTYPE 821 822Proxy client key type. See CURLOPT_PROXY_SSLKEYTYPE(3) 823 824## CURLOPT_PROXY_SSLKEY_BLOB 825 826Proxy client key. See CURLOPT_PROXY_SSLKEY_BLOB(3) 827 828## CURLOPT_PROXY_SSLVERSION 829 830Proxy SSL version to use. See CURLOPT_PROXY_SSLVERSION(3) 831 832## CURLOPT_PROXY_SSL_CIPHER_LIST 833 834Proxy ciphers to use. See CURLOPT_PROXY_SSL_CIPHER_LIST(3) 835 836## CURLOPT_PROXY_SSL_OPTIONS 837 838Control proxy SSL behavior. See CURLOPT_PROXY_SSL_OPTIONS(3) 839 840## CURLOPT_PROXY_SSL_VERIFYHOST 841 842Verify the hostname in the proxy SSL certificate. See 843CURLOPT_PROXY_SSL_VERIFYHOST(3) 844 845## CURLOPT_PROXY_SSL_VERIFYPEER 846 847Verify the proxy SSL certificate. See CURLOPT_PROXY_SSL_VERIFYPEER(3) 848 849## CURLOPT_PROXY_TLS13_CIPHERS 850 851Proxy TLS 1.3 cipher suites to use. See CURLOPT_PROXY_TLS13_CIPHERS(3) 852 853## CURLOPT_PROXY_TLSAUTH_PASSWORD 854 855Proxy TLS authentication password. See CURLOPT_PROXY_TLSAUTH_PASSWORD(3) 856 857## CURLOPT_PROXY_TLSAUTH_TYPE 858 859Proxy TLS authentication methods. See CURLOPT_PROXY_TLSAUTH_TYPE(3) 860 861## CURLOPT_PROXY_TLSAUTH_USERNAME 862 863Proxy TLS authentication username. See CURLOPT_PROXY_TLSAUTH_USERNAME(3) 864 865## CURLOPT_PROXY_TRANSFER_MODE 866 867Add transfer mode to URL over proxy. See CURLOPT_PROXY_TRANSFER_MODE(3) 868 869## CURLOPT_PUT 870 871**Deprecated option** Issue an HTTP PUT request. See CURLOPT_PUT(3) 872 873## CURLOPT_QUICK_EXIT 874 875To be set by toplevel tools like "curl" to skip lengthy cleanups when they are 876about to call exit() anyway. See CURLOPT_QUICK_EXIT(3) 877 878## CURLOPT_QUOTE 879 880Commands to run before transfer. See CURLOPT_QUOTE(3) 881 882## CURLOPT_RANDOM_FILE 883 884**OBSOLETE** Provide source for entropy random data. 885See CURLOPT_RANDOM_FILE(3) 886 887## CURLOPT_RANGE 888 889Range requests. See CURLOPT_RANGE(3) 890 891## CURLOPT_READDATA 892 893Data pointer to pass to the read callback. See CURLOPT_READDATA(3) 894 895## CURLOPT_READFUNCTION 896 897Callback for reading data. See CURLOPT_READFUNCTION(3) 898 899## CURLOPT_REDIR_PROTOCOLS 900 901**Deprecated option** Protocols to allow redirects to. See 902CURLOPT_REDIR_PROTOCOLS(3) 903 904## CURLOPT_REDIR_PROTOCOLS_STR 905 906Protocols to allow redirects to. See CURLOPT_REDIR_PROTOCOLS_STR(3) 907 908## CURLOPT_REFERER 909 910Referer: header. See CURLOPT_REFERER(3) 911 912## CURLOPT_REQUEST_TARGET 913 914Set the request target. CURLOPT_REQUEST_TARGET(3) 915 916## CURLOPT_RESOLVE 917 918Provide fixed/fake name resolves. See CURLOPT_RESOLVE(3) 919 920## CURLOPT_RESOLVER_START_DATA 921 922Data pointer to pass to resolver start callback. See 923CURLOPT_RESOLVER_START_DATA(3) 924 925## CURLOPT_RESOLVER_START_FUNCTION 926 927Callback to be called before a new resolve request is started. See 928CURLOPT_RESOLVER_START_FUNCTION(3) 929 930## CURLOPT_RESUME_FROM 931 932Resume a transfer. See CURLOPT_RESUME_FROM(3) 933 934## CURLOPT_RESUME_FROM_LARGE 935 936Resume a transfer. See CURLOPT_RESUME_FROM_LARGE(3) 937 938## CURLOPT_RTSP_CLIENT_CSEQ 939 940Client CSEQ number. See CURLOPT_RTSP_CLIENT_CSEQ(3) 941 942## CURLOPT_RTSP_REQUEST 943 944RTSP request. See CURLOPT_RTSP_REQUEST(3) 945 946## CURLOPT_RTSP_SERVER_CSEQ 947 948CSEQ number for RTSP Server-\>Client request. See CURLOPT_RTSP_SERVER_CSEQ(3) 949 950## CURLOPT_RTSP_SESSION_ID 951 952RTSP session-id. See CURLOPT_RTSP_SESSION_ID(3) 953 954## CURLOPT_RTSP_STREAM_URI 955 956RTSP stream URI. See CURLOPT_RTSP_STREAM_URI(3) 957 958## CURLOPT_RTSP_TRANSPORT 959 960RTSP Transport: header. See CURLOPT_RTSP_TRANSPORT(3) 961 962## CURLOPT_SASL_AUTHZID 963 964SASL authorization identity (identity to act as). See CURLOPT_SASL_AUTHZID(3) 965 966## CURLOPT_SASL_IR 967 968Enable SASL initial response. See CURLOPT_SASL_IR(3) 969 970## CURLOPT_SEEKDATA 971 972Data pointer to pass to the seek callback. See CURLOPT_SEEKDATA(3) 973 974## CURLOPT_SEEKFUNCTION 975 976Callback for seek operations. See CURLOPT_SEEKFUNCTION(3) 977 978## CURLOPT_SERVER_RESPONSE_TIMEOUT 979 980Timeout for server responses. See CURLOPT_SERVER_RESPONSE_TIMEOUT(3) 981 982## CURLOPT_SERVER_RESPONSE_TIMEOUT_MS 983 984Timeout for server responses. See CURLOPT_SERVER_RESPONSE_TIMEOUT_MS(3) 985 986## CURLOPT_SERVICE_NAME 987 988Authentication service name. CURLOPT_SERVICE_NAME(3) 989 990## CURLOPT_SHARE 991 992Share object to use. See CURLOPT_SHARE(3) 993 994## CURLOPT_SOCKOPTDATA 995 996Data pointer to pass to the sockopt callback. See CURLOPT_SOCKOPTDATA(3) 997 998## CURLOPT_SOCKOPTFUNCTION 999 1000Callback for sockopt operations. See CURLOPT_SOCKOPTFUNCTION(3) 1001 1002## CURLOPT_SOCKS5_AUTH 1003 1004Socks5 authentication methods. See CURLOPT_SOCKS5_AUTH(3) 1005 1006## CURLOPT_SOCKS5_GSSAPI_NEC 1007 1008Socks5 GSSAPI NEC mode. See CURLOPT_SOCKS5_GSSAPI_NEC(3) 1009 1010## CURLOPT_SOCKS5_GSSAPI_SERVICE 1011 1012**Deprecated option** Socks5 GSSAPI service name. 1013See CURLOPT_SOCKS5_GSSAPI_SERVICE(3) 1014 1015## CURLOPT_SSH_AUTH_TYPES 1016 1017SSH authentication types. See CURLOPT_SSH_AUTH_TYPES(3) 1018 1019## CURLOPT_SSH_COMPRESSION 1020 1021Enable SSH compression. See CURLOPT_SSH_COMPRESSION(3) 1022 1023## CURLOPT_SSH_HOSTKEYDATA 1024 1025Custom pointer to pass to ssh host key callback. See CURLOPT_SSH_HOSTKEYDATA(3) 1026 1027## CURLOPT_SSH_HOSTKEYFUNCTION 1028 1029Callback for checking host key handling. See CURLOPT_SSH_HOSTKEYFUNCTION(3) 1030 1031## CURLOPT_SSH_HOST_PUBLIC_KEY_MD5 1032 1033MD5 of host's public key. See CURLOPT_SSH_HOST_PUBLIC_KEY_MD5(3) 1034 1035## CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256 1036 1037SHA256 of host's public key. See CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256(3) 1038 1039## CURLOPT_SSH_KEYDATA 1040 1041Custom pointer to pass to ssh key callback. See CURLOPT_SSH_KEYDATA(3) 1042 1043## CURLOPT_SSH_KEYFUNCTION 1044 1045Callback for known hosts handling. See CURLOPT_SSH_KEYFUNCTION(3) 1046 1047## CURLOPT_SSH_KNOWNHOSTS 1048 1049Filename with known hosts. See CURLOPT_SSH_KNOWNHOSTS(3) 1050 1051## CURLOPT_SSH_PRIVATE_KEYFILE 1052 1053Filename of the private key. See CURLOPT_SSH_PRIVATE_KEYFILE(3) 1054 1055## CURLOPT_SSH_PUBLIC_KEYFILE 1056 1057Filename of the public key. See CURLOPT_SSH_PUBLIC_KEYFILE(3) 1058 1059## CURLOPT_SSLCERT 1060 1061Client cert. See CURLOPT_SSLCERT(3) 1062 1063## CURLOPT_SSLCERTTYPE 1064 1065Client cert type. See CURLOPT_SSLCERTTYPE(3) 1066 1067## CURLOPT_SSLCERT_BLOB 1068 1069Client cert memory buffer. See CURLOPT_SSLCERT_BLOB(3) 1070 1071## CURLOPT_SSLENGINE 1072 1073Use identifier with SSL engine. See CURLOPT_SSLENGINE(3) 1074 1075## CURLOPT_SSLENGINE_DEFAULT 1076 1077Default SSL engine. See CURLOPT_SSLENGINE_DEFAULT(3) 1078 1079## CURLOPT_SSLKEY 1080 1081Client key. See CURLOPT_SSLKEY(3) 1082 1083## CURLOPT_SSLKEYTYPE 1084 1085Client key type. See CURLOPT_SSLKEYTYPE(3) 1086 1087## CURLOPT_SSLKEY_BLOB 1088 1089Client key memory buffer. See CURLOPT_SSLKEY_BLOB(3) 1090 1091## CURLOPT_SSLVERSION 1092 1093SSL version to use. See CURLOPT_SSLVERSION(3) 1094 1095## CURLOPT_SSL_CIPHER_LIST 1096 1097Ciphers to use. See CURLOPT_SSL_CIPHER_LIST(3) 1098 1099## CURLOPT_SSL_CTX_DATA 1100 1101Data pointer to pass to the SSL context callback. See CURLOPT_SSL_CTX_DATA(3) 1102 1103## CURLOPT_SSL_CTX_FUNCTION 1104 1105Callback for SSL context logic. See CURLOPT_SSL_CTX_FUNCTION(3) 1106 1107## CURLOPT_SSL_EC_CURVES 1108 1109Set key exchange curves. See CURLOPT_SSL_EC_CURVES(3) 1110 1111## CURLOPT_SSL_ENABLE_ALPN 1112 1113Enable use of ALPN. See CURLOPT_SSL_ENABLE_ALPN(3) 1114 1115## CURLOPT_SSL_ENABLE_NPN 1116 1117**OBSOLETE** Enable use of NPN. See CURLOPT_SSL_ENABLE_NPN(3) 1118 1119## CURLOPT_SSL_FALSESTART 1120 1121Enable TLS False Start. See CURLOPT_SSL_FALSESTART(3) 1122 1123## CURLOPT_SSL_OPTIONS 1124 1125Control SSL behavior. See CURLOPT_SSL_OPTIONS(3) 1126 1127## CURLOPT_SSL_SESSIONID_CACHE 1128 1129Disable SSL session-id cache. See CURLOPT_SSL_SESSIONID_CACHE(3) 1130 1131## CURLOPT_SSL_VERIFYHOST 1132 1133Verify the hostname in the SSL certificate. See CURLOPT_SSL_VERIFYHOST(3) 1134 1135## CURLOPT_SSL_VERIFYPEER 1136 1137Verify the SSL certificate. See CURLOPT_SSL_VERIFYPEER(3) 1138 1139## CURLOPT_SSL_VERIFYSTATUS 1140 1141Verify the SSL certificate's status. See CURLOPT_SSL_VERIFYSTATUS(3) 1142 1143## CURLOPT_STDERR 1144 1145Redirect stderr to another stream. See CURLOPT_STDERR(3) 1146 1147## CURLOPT_STREAM_DEPENDS 1148 1149This HTTP/2 stream depends on another. See CURLOPT_STREAM_DEPENDS(3) 1150 1151## CURLOPT_STREAM_DEPENDS_E 1152 1153This HTTP/2 stream depends on another exclusively. See 1154CURLOPT_STREAM_DEPENDS_E(3) 1155 1156## CURLOPT_STREAM_WEIGHT 1157 1158Set this HTTP/2 stream's weight. See CURLOPT_STREAM_WEIGHT(3) 1159 1160## CURLOPT_SUPPRESS_CONNECT_HEADERS 1161 1162Suppress proxy CONNECT response headers from user callbacks. See 1163CURLOPT_SUPPRESS_CONNECT_HEADERS(3) 1164 1165## CURLOPT_TCP_FASTOPEN 1166 1167Enable TCP Fast Open. See CURLOPT_TCP_FASTOPEN(3) 1168 1169## CURLOPT_TCP_KEEPALIVE 1170 1171Enable TCP keep-alive. See CURLOPT_TCP_KEEPALIVE(3) 1172 1173## CURLOPT_TCP_KEEPCNT 1174 1175Maximum number of keep-alive probes. See CURLOPT_TCP_KEEPCNT(3) 1176 1177## CURLOPT_TCP_KEEPIDLE 1178 1179Idle time before sending keep-alive. See CURLOPT_TCP_KEEPIDLE(3) 1180 1181## CURLOPT_TCP_KEEPINTVL 1182 1183Interval between keep-alive probes. See CURLOPT_TCP_KEEPINTVL(3) 1184 1185## CURLOPT_TCP_NODELAY 1186 1187Disable the Nagle algorithm. See CURLOPT_TCP_NODELAY(3) 1188 1189## CURLOPT_TELNETOPTIONS 1190 1191TELNET options. See CURLOPT_TELNETOPTIONS(3) 1192 1193## CURLOPT_TFTP_BLKSIZE 1194 1195TFTP block size. See CURLOPT_TFTP_BLKSIZE(3) 1196 1197## CURLOPT_TFTP_NO_OPTIONS 1198 1199Do not send TFTP options requests. See CURLOPT_TFTP_NO_OPTIONS(3) 1200 1201## CURLOPT_TIMECONDITION 1202 1203Make a time conditional request. See CURLOPT_TIMECONDITION(3) 1204 1205## CURLOPT_TIMEOUT 1206 1207Timeout for the entire request. See CURLOPT_TIMEOUT(3) 1208 1209## CURLOPT_TIMEOUT_MS 1210 1211Millisecond timeout for the entire request. See CURLOPT_TIMEOUT_MS(3) 1212 1213## CURLOPT_TIMEVALUE 1214 1215Time value for the time conditional request. See CURLOPT_TIMEVALUE(3) 1216 1217## CURLOPT_TIMEVALUE_LARGE 1218 1219Time value for the time conditional request. See CURLOPT_TIMEVALUE_LARGE(3) 1220 1221## CURLOPT_TLS13_CIPHERS 1222 1223TLS 1.3 cipher suites to use. See CURLOPT_TLS13_CIPHERS(3) 1224 1225## CURLOPT_TLSAUTH_PASSWORD 1226 1227TLS authentication password. See CURLOPT_TLSAUTH_PASSWORD(3) 1228 1229## CURLOPT_TLSAUTH_TYPE 1230 1231TLS authentication methods. See CURLOPT_TLSAUTH_TYPE(3) 1232 1233## CURLOPT_TLSAUTH_USERNAME 1234 1235TLS authentication username. See CURLOPT_TLSAUTH_USERNAME(3) 1236 1237## CURLOPT_TRAILERDATA 1238 1239Custom pointer passed to the trailing headers callback. See 1240CURLOPT_TRAILERDATA(3) 1241 1242## CURLOPT_TRAILERFUNCTION 1243 1244Set callback for sending trailing headers. See 1245CURLOPT_TRAILERFUNCTION(3) 1246 1247## CURLOPT_TRANSFERTEXT 1248 1249Use text transfer. See CURLOPT_TRANSFERTEXT(3) 1250 1251## CURLOPT_TRANSFER_ENCODING 1252 1253Request Transfer-Encoding. See CURLOPT_TRANSFER_ENCODING(3) 1254 1255## CURLOPT_UNIX_SOCKET_PATH 1256 1257Path to a Unix domain socket. See CURLOPT_UNIX_SOCKET_PATH(3) 1258 1259## CURLOPT_UNRESTRICTED_AUTH 1260 1261Do not restrict authentication to original host. CURLOPT_UNRESTRICTED_AUTH(3) 1262 1263## CURLOPT_UPKEEP_INTERVAL_MS 1264 1265Sets the interval at which connection upkeep are performed. See 1266CURLOPT_UPKEEP_INTERVAL_MS(3) 1267 1268## CURLOPT_UPLOAD 1269 1270Upload data. See CURLOPT_UPLOAD(3) 1271 1272## CURLOPT_UPLOAD_BUFFERSIZE 1273 1274Set upload buffer size. See CURLOPT_UPLOAD_BUFFERSIZE(3) 1275 1276## CURLOPT_URL 1277 1278URL to work on. See CURLOPT_URL(3) 1279 1280## CURLOPT_USERAGENT 1281 1282User-Agent: header. See CURLOPT_USERAGENT(3) 1283 1284## CURLOPT_USERNAME 1285 1286Username. See CURLOPT_USERNAME(3) 1287 1288## CURLOPT_USERPWD 1289 1290Username and password. See CURLOPT_USERPWD(3) 1291 1292## CURLOPT_USE_SSL 1293 1294Use TLS/SSL. See CURLOPT_USE_SSL(3) 1295 1296## CURLOPT_VERBOSE 1297 1298Display verbose information. See CURLOPT_VERBOSE(3) 1299 1300## CURLOPT_WILDCARDMATCH 1301 1302Transfer multiple files according to a filename pattern. See 1303CURLOPT_WILDCARDMATCH(3) 1304 1305## CURLOPT_WRITEDATA 1306 1307Data pointer to pass to the write callback. See CURLOPT_WRITEDATA(3) 1308 1309## CURLOPT_WRITEFUNCTION 1310 1311Callback for writing data. See CURLOPT_WRITEFUNCTION(3) 1312 1313## CURLOPT_WS_OPTIONS 1314 1315Set WebSocket options. See CURLOPT_WS_OPTIONS(3) 1316 1317## CURLOPT_XFERINFODATA 1318 1319Data pointer to pass to the progress meter callback. See 1320CURLOPT_XFERINFODATA(3) 1321 1322## CURLOPT_XFERINFOFUNCTION 1323 1324Callback for progress meter. See CURLOPT_XFERINFOFUNCTION(3) 1325 1326## CURLOPT_XOAUTH2_BEARER 1327 1328OAuth2 bearer token. See CURLOPT_XOAUTH2_BEARER(3) 1329 1330# %PROTOCOLS% 1331 1332# EXAMPLE 1333 1334~~~c 1335int main(void) 1336{ 1337 CURL *curl = curl_easy_init(); 1338 if(curl) { 1339 CURLcode res; 1340 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); 1341 res = curl_easy_perform(curl); 1342 curl_easy_cleanup(curl); 1343 } 1344} 1345~~~ 1346 1347# %AVAILABILITY% 1348 1349# RETURN VALUE 1350 1351*CURLE_OK* (zero) means that the option was set properly, non-zero means an 1352error occurred as *\<curl/curl.h\>* defines. See the libcurl-errors(3) man 1353page for the full list with descriptions. 1354 1355Strings passed on to libcurl must be shorter than 8000000 bytes, otherwise 1356curl_easy_setopt(3) returns **CURLE_BAD_FUNCTION_ARGUMENT** (added in 7.65.0). 1357 1358**CURLE_BAD_FUNCTION_ARGUMENT** is returned when the argument to an option is 1359invalid, like perhaps out of range. 1360 1361If you try to set an option that libcurl does not know about, perhaps because 1362the library is too old to support it or the option was removed in a recent 1363version, this function returns *CURLE_UNKNOWN_OPTION*. If support for the 1364option was disabled at compile-time, it returns *CURLE_NOT_BUILT_IN*. 1365
