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 18--- 19 20# NAME 21 22curl_easy_setopt - set options for a curl easy handle 23 24# SYNOPSIS 25 26~~~c 27#include <curl/curl.h> 28 29CURLcode curl_easy_setopt(CURL *handle, CURLoption option, parameter); 30~~~ 31 32# DESCRIPTION 33 34curl_easy_setopt(3) is used to tell libcurl how to behave. By setting the 35appropriate options, the application can change libcurl's behavior. All 36options are set with an *option* followed by a *parameter*. That parameter can 37be a **long**, a **function pointer**, an **object pointer** or a 38**curl_off_t**, depending on what the specific option expects. Read this 39manual carefully as bad input values may cause libcurl to behave badly! You 40can only set one option in each function call. A typical application uses many 41curl_easy_setopt(3) calls in the setup phase. 42 43Options set with this function call are valid for all forthcoming transfers 44performed using this *handle*. The options are not in any way reset between 45transfers, so if you want subsequent transfers with different options, you 46must change them between the transfers. You can optionally reset all options 47back to internal default with curl_easy_reset(3). 48 49Strings passed to libcurl as 'char *' arguments, are copied by the library; 50the string storage associated to the pointer argument may be discarded or 51reused after curl_easy_setopt(3) returns. The only exception to this rule is 52really CURLOPT_POSTFIELDS(3), but the alternative that copies the string 53CURLOPT_COPYPOSTFIELDS(3) has some usage characteristics you need to read up 54on. This function does not accept input strings longer than 55**CURL_MAX_INPUT_LENGTH** (8 MB). 56 57The order in which the options are set does not matter. 58 59Before version 7.17.0, strings were not copied. Instead the user was forced 60keep them available until libcurl no longer needed them. 61 62The *handle* is the return code from a curl_easy_init(3) or 63curl_easy_duphandle(3) call. 64 65# BEHAVIOR OPTIONS 66 67## CURLOPT_VERBOSE 68 69Display verbose information. See CURLOPT_VERBOSE(3) 70 71## CURLOPT_HEADER 72 73Include the header in the body output. See CURLOPT_HEADER(3) 74 75## CURLOPT_NOPROGRESS 76 77Shut off the progress meter. See CURLOPT_NOPROGRESS(3) 78 79## CURLOPT_NOSIGNAL 80 81Do not install signal handlers. See CURLOPT_NOSIGNAL(3) 82 83## CURLOPT_WILDCARDMATCH 84 85Transfer multiple files according to a filename pattern. See 86CURLOPT_WILDCARDMATCH(3) 87 88# CALLBACK OPTIONS 89 90## CURLOPT_WRITEFUNCTION 91 92Callback for writing data. See CURLOPT_WRITEFUNCTION(3) 93 94## CURLOPT_WRITEDATA 95 96Data pointer to pass to the write callback. See CURLOPT_WRITEDATA(3) 97 98## CURLOPT_READFUNCTION 99 100Callback for reading data. See CURLOPT_READFUNCTION(3) 101 102## CURLOPT_READDATA 103 104Data pointer to pass to the read callback. See CURLOPT_READDATA(3) 105 106## CURLOPT_IOCTLFUNCTION 107 108**Deprecated option** Callback for I/O operations. 109See CURLOPT_IOCTLFUNCTION(3) 110 111## CURLOPT_IOCTLDATA 112 113**Deprecated option** Data pointer to pass to the I/O callback. 114See CURLOPT_IOCTLDATA(3) 115 116## CURLOPT_SEEKFUNCTION 117 118Callback for seek operations. See CURLOPT_SEEKFUNCTION(3) 119 120## CURLOPT_SEEKDATA 121 122Data pointer to pass to the seek callback. See CURLOPT_SEEKDATA(3) 123 124## CURLOPT_SOCKOPTFUNCTION 125 126Callback for sockopt operations. See CURLOPT_SOCKOPTFUNCTION(3) 127 128## CURLOPT_SOCKOPTDATA 129 130Data pointer to pass to the sockopt callback. See CURLOPT_SOCKOPTDATA(3) 131 132## CURLOPT_OPENSOCKETFUNCTION 133 134Callback for socket creation. See CURLOPT_OPENSOCKETFUNCTION(3) 135 136## CURLOPT_OPENSOCKETDATA 137 138Data pointer to pass to the open socket callback. See CURLOPT_OPENSOCKETDATA(3) 139 140## CURLOPT_CLOSESOCKETFUNCTION 141 142Callback for closing socket. See CURLOPT_CLOSESOCKETFUNCTION(3) 143 144## CURLOPT_CLOSESOCKETDATA 145 146Data pointer to pass to the close socket callback. See CURLOPT_CLOSESOCKETDATA(3) 147 148## CURLOPT_PROGRESSFUNCTION 149 150**OBSOLETE** callback for progress meter. 151See CURLOPT_PROGRESSFUNCTION(3) 152 153## CURLOPT_PROGRESSDATA 154 155Data pointer to pass to the progress meter callback. See CURLOPT_PROGRESSDATA(3) 156 157## CURLOPT_XFERINFOFUNCTION 158 159Callback for progress meter. See CURLOPT_XFERINFOFUNCTION(3) 160 161## CURLOPT_XFERINFODATA 162 163Data pointer to pass to the progress meter callback. See CURLOPT_XFERINFODATA(3) 164 165## CURLOPT_HEADERFUNCTION 166 167Callback for writing received headers. See CURLOPT_HEADERFUNCTION(3) 168 169## CURLOPT_HEADERDATA 170 171Data pointer to pass to the header callback. See CURLOPT_HEADERDATA(3) 172 173## CURLOPT_DEBUGFUNCTION 174 175Callback for debug information. See CURLOPT_DEBUGFUNCTION(3) 176 177## CURLOPT_DEBUGDATA 178 179Data pointer to pass to the debug callback. See CURLOPT_DEBUGDATA(3) 180 181## CURLOPT_SSL_CTX_FUNCTION 182 183Callback for SSL context logic. See CURLOPT_SSL_CTX_FUNCTION(3) 184 185## CURLOPT_SSL_CTX_DATA 186 187Data pointer to pass to the SSL context callback. See CURLOPT_SSL_CTX_DATA(3) 188 189## CURLOPT_CONV_TO_NETWORK_FUNCTION 190 191**OBSOLETE** Callback for code base conversion. 192See CURLOPT_CONV_TO_NETWORK_FUNCTION(3) 193 194## CURLOPT_CONV_FROM_NETWORK_FUNCTION 195 196**OBSOLETE** Callback for code base conversion. 197See CURLOPT_CONV_FROM_NETWORK_FUNCTION(3) 198 199## CURLOPT_CONV_FROM_UTF8_FUNCTION 200 201**OBSOLETE** Callback for code base conversion. 202See CURLOPT_CONV_FROM_UTF8_FUNCTION(3) 203 204## CURLOPT_INTERLEAVEFUNCTION 205 206Callback for RTSP interleaved data. See CURLOPT_INTERLEAVEFUNCTION(3) 207 208## CURLOPT_INTERLEAVEDATA 209 210Data pointer to pass to the RTSP interleave callback. See CURLOPT_INTERLEAVEDATA(3) 211 212## CURLOPT_CHUNK_BGN_FUNCTION 213 214Callback for wildcard download start of chunk. See CURLOPT_CHUNK_BGN_FUNCTION(3) 215 216## CURLOPT_CHUNK_END_FUNCTION 217 218Callback for wildcard download end of chunk. See CURLOPT_CHUNK_END_FUNCTION(3) 219 220## CURLOPT_CHUNK_DATA 221 222Data pointer to pass to the chunk callbacks. See CURLOPT_CHUNK_DATA(3) 223 224## CURLOPT_FNMATCH_FUNCTION 225 226Callback for wildcard matching. See CURLOPT_FNMATCH_FUNCTION(3) 227 228## CURLOPT_FNMATCH_DATA 229 230Data pointer to pass to the wildcard matching callback. See CURLOPT_FNMATCH_DATA(3) 231 232## CURLOPT_SUPPRESS_CONNECT_HEADERS 233 234Suppress proxy CONNECT response headers from user callbacks. See 235CURLOPT_SUPPRESS_CONNECT_HEADERS(3) 236 237## CURLOPT_RESOLVER_START_FUNCTION 238 239Callback to be called before a new resolve request is started. See 240CURLOPT_RESOLVER_START_FUNCTION(3) 241 242## CURLOPT_RESOLVER_START_DATA 243 244Data pointer to pass to resolver start callback. See CURLOPT_RESOLVER_START_DATA(3) 245 246## CURLOPT_PREREQFUNCTION 247 248Callback to be called after a connection is established but before a request 249is made on that connection. See CURLOPT_PREREQFUNCTION(3) 250 251## CURLOPT_PREREQDATA 252 253Data pointer to pass to the CURLOPT_PREREQFUNCTION callback. See 254CURLOPT_PREREQDATA(3) 255 256# ERROR OPTIONS 257 258## CURLOPT_ERRORBUFFER 259 260Error message buffer. See CURLOPT_ERRORBUFFER(3) 261 262## CURLOPT_STDERR 263 264stderr replacement stream. See CURLOPT_STDERR(3) 265 266## CURLOPT_FAILONERROR 267 268Fail on HTTP 4xx errors. CURLOPT_FAILONERROR(3) 269 270## CURLOPT_KEEP_SENDING_ON_ERROR 271 272Keep sending on HTTP \>= 300 errors. CURLOPT_KEEP_SENDING_ON_ERROR(3) 273 274# NETWORK OPTIONS 275 276## CURLOPT_URL 277 278URL to work on. See CURLOPT_URL(3) 279 280## CURLOPT_PATH_AS_IS 281 282Disable squashing /../ and /./ sequences in the path. See CURLOPT_PATH_AS_IS(3) 283 284## CURLOPT_PROTOCOLS 285 286**Deprecated option** Allowed protocols. See CURLOPT_PROTOCOLS(3) 287 288## CURLOPT_PROTOCOLS_STR 289 290Allowed protocols. See CURLOPT_PROTOCOLS_STR(3) 291 292## CURLOPT_REDIR_PROTOCOLS 293 294**Deprecated option** Protocols to allow redirects to. See 295CURLOPT_REDIR_PROTOCOLS(3) 296 297## CURLOPT_REDIR_PROTOCOLS_STR 298 299Protocols to allow redirects to. See CURLOPT_REDIR_PROTOCOLS_STR(3) 300 301## CURLOPT_DEFAULT_PROTOCOL 302 303Default protocol. See CURLOPT_DEFAULT_PROTOCOL(3) 304 305## CURLOPT_PROXY 306 307Proxy to use. See CURLOPT_PROXY(3) 308 309## CURLOPT_PRE_PROXY 310 311Socks proxy to use. See CURLOPT_PRE_PROXY(3) 312 313## CURLOPT_PROXYPORT 314 315Proxy port to use. See CURLOPT_PROXYPORT(3) 316 317## CURLOPT_PROXYTYPE 318 319Proxy type. See CURLOPT_PROXYTYPE(3) 320 321## CURLOPT_NOPROXY 322 323Filter out hosts from proxy use. CURLOPT_NOPROXY(3) 324 325## CURLOPT_HTTPPROXYTUNNEL 326 327Tunnel through the HTTP proxy. CURLOPT_HTTPPROXYTUNNEL(3) 328 329## CURLOPT_CONNECT_TO 330 331Connect to a specific host and port. See CURLOPT_CONNECT_TO(3) 332 333## CURLOPT_SOCKS5_AUTH 334 335Socks5 authentication methods. See CURLOPT_SOCKS5_AUTH(3) 336 337## CURLOPT_SOCKS5_GSSAPI_SERVICE 338 339**Deprecated option** Socks5 GSSAPI service name. 340See CURLOPT_SOCKS5_GSSAPI_SERVICE(3) 341 342## CURLOPT_SOCKS5_GSSAPI_NEC 343 344Socks5 GSSAPI NEC mode. See CURLOPT_SOCKS5_GSSAPI_NEC(3) 345 346## CURLOPT_PROXY_SERVICE_NAME 347 348Proxy authentication service name. CURLOPT_PROXY_SERVICE_NAME(3) 349 350## CURLOPT_HAPROXYPROTOCOL 351 352Send an HAProxy PROXY protocol v1 header. See CURLOPT_HAPROXYPROTOCOL(3) 353 354## CURLOPT_HAPROXY_CLIENT_IP 355 356Spoof the client IP in an HAProxy PROXY protocol v1 header. See 357CURLOPT_HAPROXY_CLIENT_IP(3) 358 359## CURLOPT_SERVICE_NAME 360 361Authentication service name. CURLOPT_SERVICE_NAME(3) 362 363## CURLOPT_INTERFACE 364 365Bind connection locally to this. See CURLOPT_INTERFACE(3) 366 367## CURLOPT_LOCALPORT 368 369Bind connection locally to this port. See CURLOPT_LOCALPORT(3) 370 371## CURLOPT_LOCALPORTRANGE 372 373Bind connection locally to port range. See CURLOPT_LOCALPORTRANGE(3) 374 375## CURLOPT_DNS_CACHE_TIMEOUT 376 377Timeout for DNS cache. See CURLOPT_DNS_CACHE_TIMEOUT(3) 378 379## CURLOPT_DNS_USE_GLOBAL_CACHE 380 381**OBSOLETE** Enable global DNS cache. 382See CURLOPT_DNS_USE_GLOBAL_CACHE(3) 383 384## CURLOPT_DOH_URL 385 386Use this DoH server for name resolves. See CURLOPT_DOH_URL(3) 387 388## CURLOPT_BUFFERSIZE 389 390Ask for alternate buffer size. See CURLOPT_BUFFERSIZE(3) 391 392## CURLOPT_PORT 393 394Port number to connect to. See CURLOPT_PORT(3) 395 396## CURLOPT_TCP_FASTOPEN 397 398Enable TCP Fast Open. See CURLOPT_TCP_FASTOPEN(3) 399 400## CURLOPT_TCP_NODELAY 401 402Disable the Nagle algorithm. See CURLOPT_TCP_NODELAY(3) 403 404## CURLOPT_ADDRESS_SCOPE 405 406IPv6 scope for local addresses. See CURLOPT_ADDRESS_SCOPE(3) 407 408## CURLOPT_TCP_KEEPALIVE 409 410Enable TCP keep-alive. See CURLOPT_TCP_KEEPALIVE(3) 411 412## CURLOPT_TCP_KEEPIDLE 413 414Idle time before sending keep-alive. See CURLOPT_TCP_KEEPIDLE(3) 415 416## CURLOPT_TCP_KEEPINTVL 417 418Interval between keep-alive probes. See CURLOPT_TCP_KEEPINTVL(3) 419 420## CURLOPT_TCP_KEEPCNT 421 422Maximum number of keep-alive probes. See CURLOPT_TCP_KEEPCNT(3) 423 424## CURLOPT_UNIX_SOCKET_PATH 425 426Path to a Unix domain socket. See CURLOPT_UNIX_SOCKET_PATH(3) 427 428## CURLOPT_ABSTRACT_UNIX_SOCKET 429 430Path to an abstract Unix domain socket. See CURLOPT_ABSTRACT_UNIX_SOCKET(3) 431 432# NAMES and PASSWORDS OPTIONS (Authentication) 433 434## CURLOPT_NETRC 435 436Enable .netrc parsing. See CURLOPT_NETRC(3) 437 438## CURLOPT_NETRC_FILE 439 440.netrc filename. See CURLOPT_NETRC_FILE(3) 441 442## CURLOPT_USERPWD 443 444Username and password. See CURLOPT_USERPWD(3) 445 446## CURLOPT_PROXYUSERPWD 447 448Proxy username and password. See CURLOPT_PROXYUSERPWD(3) 449 450## CURLOPT_USERNAME 451 452Username. See CURLOPT_USERNAME(3) 453 454## CURLOPT_PASSWORD 455 456Password. See CURLOPT_PASSWORD(3) 457 458## CURLOPT_LOGIN_OPTIONS 459 460Login options. See CURLOPT_LOGIN_OPTIONS(3) 461 462## CURLOPT_PROXYUSERNAME 463 464Proxy username. See CURLOPT_PROXYUSERNAME(3) 465 466## CURLOPT_PROXYPASSWORD 467 468Proxy password. See CURLOPT_PROXYPASSWORD(3) 469 470## CURLOPT_HTTPAUTH 471 472HTTP server authentication methods. See CURLOPT_HTTPAUTH(3) 473 474## CURLOPT_TLSAUTH_USERNAME 475 476TLS authentication username. See CURLOPT_TLSAUTH_USERNAME(3) 477 478## CURLOPT_PROXY_TLSAUTH_USERNAME 479 480Proxy TLS authentication username. See CURLOPT_PROXY_TLSAUTH_USERNAME(3) 481 482## CURLOPT_TLSAUTH_PASSWORD 483 484TLS authentication password. See CURLOPT_TLSAUTH_PASSWORD(3) 485 486## CURLOPT_PROXY_TLSAUTH_PASSWORD 487 488Proxy TLS authentication password. See CURLOPT_PROXY_TLSAUTH_PASSWORD(3) 489 490## CURLOPT_TLSAUTH_TYPE 491 492TLS authentication methods. See CURLOPT_TLSAUTH_TYPE(3) 493 494## CURLOPT_PROXY_TLSAUTH_TYPE 495 496Proxy TLS authentication methods. See CURLOPT_PROXY_TLSAUTH_TYPE(3) 497 498## CURLOPT_PROXYAUTH 499 500HTTP proxy authentication methods. See CURLOPT_PROXYAUTH(3) 501 502## CURLOPT_SASL_AUTHZID 503 504SASL authorization identity (identity to act as). See CURLOPT_SASL_AUTHZID(3) 505 506## CURLOPT_SASL_IR 507 508Enable SASL initial response. See CURLOPT_SASL_IR(3) 509 510## CURLOPT_XOAUTH2_BEARER 511 512OAuth2 bearer token. See CURLOPT_XOAUTH2_BEARER(3) 513 514## CURLOPT_DISALLOW_USERNAME_IN_URL 515 516Do not allow username in URL. See CURLOPT_DISALLOW_USERNAME_IN_URL(3) 517 518# HTTP OPTIONS 519 520## CURLOPT_AUTOREFERER 521 522Automatically set Referer: header. See CURLOPT_AUTOREFERER(3) 523 524## CURLOPT_ACCEPT_ENCODING 525 526Accept-Encoding and automatic decompressing data. See CURLOPT_ACCEPT_ENCODING(3) 527 528## CURLOPT_TRANSFER_ENCODING 529 530Request Transfer-Encoding. See CURLOPT_TRANSFER_ENCODING(3) 531 532## CURLOPT_FOLLOWLOCATION 533 534Follow HTTP redirects. See CURLOPT_FOLLOWLOCATION(3) 535 536## CURLOPT_UNRESTRICTED_AUTH 537 538Do not restrict authentication to original host. CURLOPT_UNRESTRICTED_AUTH(3) 539 540## CURLOPT_MAXREDIRS 541 542Maximum number of redirects to follow. See CURLOPT_MAXREDIRS(3) 543 544## CURLOPT_POSTREDIR 545 546How to act on redirects after POST. See CURLOPT_POSTREDIR(3) 547 548## CURLOPT_PUT 549 550**Deprecated option** Issue an HTTP PUT request. See CURLOPT_PUT(3) 551 552## CURLOPT_POST 553 554Issue an HTTP POST request. See CURLOPT_POST(3) 555 556## CURLOPT_POSTFIELDS 557 558Send a POST with this data. See CURLOPT_POSTFIELDS(3) 559 560## CURLOPT_POSTFIELDSIZE 561 562The POST data is this big. See CURLOPT_POSTFIELDSIZE(3) 563 564## CURLOPT_POSTFIELDSIZE_LARGE 565 566The POST data is this big. See CURLOPT_POSTFIELDSIZE_LARGE(3) 567 568## CURLOPT_COPYPOSTFIELDS 569 570Send a POST with this data - and copy it. See CURLOPT_COPYPOSTFIELDS(3) 571 572## CURLOPT_HTTPPOST 573 574**Deprecated option** Multipart formpost HTTP POST. 575See CURLOPT_HTTPPOST(3) 576 577## CURLOPT_REFERER 578 579Referer: header. See CURLOPT_REFERER(3) 580 581## CURLOPT_USERAGENT 582 583User-Agent: header. See CURLOPT_USERAGENT(3) 584 585## CURLOPT_HTTPHEADER 586 587Custom HTTP headers. See CURLOPT_HTTPHEADER(3) 588 589## CURLOPT_HEADEROPT 590 591Control custom headers. See CURLOPT_HEADEROPT(3) 592 593## CURLOPT_PROXYHEADER 594 595Custom HTTP headers sent to proxy. See CURLOPT_PROXYHEADER(3) 596 597## CURLOPT_HTTP200ALIASES 598 599Alternative versions of 200 OK. See CURLOPT_HTTP200ALIASES(3) 600 601## CURLOPT_COOKIE 602 603Cookie(s) to send. See CURLOPT_COOKIE(3) 604 605## CURLOPT_COOKIEFILE 606 607File to read cookies from. See CURLOPT_COOKIEFILE(3) 608 609## CURLOPT_COOKIEJAR 610 611File to write cookies to. See CURLOPT_COOKIEJAR(3) 612 613## CURLOPT_COOKIESESSION 614 615Start a new cookie session. See CURLOPT_COOKIESESSION(3) 616 617## CURLOPT_COOKIELIST 618 619Add or control cookies. See CURLOPT_COOKIELIST(3) 620 621## CURLOPT_ALTSVC 622 623Specify the Alt-Svc: cache filename. See CURLOPT_ALTSVC(3) 624 625## CURLOPT_ALTSVC_CTRL 626 627Enable and configure Alt-Svc: treatment. See CURLOPT_ALTSVC_CTRL(3) 628 629## CURLOPT_HSTS 630 631Set HSTS cache file. See CURLOPT_HSTS(3) 632 633## CURLOPT_HSTS_CTRL 634 635Enable HSTS. See CURLOPT_HSTS_CTRL(3) 636 637## CURLOPT_HSTSREADFUNCTION 638 639Set HSTS read callback. See CURLOPT_HSTSREADFUNCTION(3) 640 641## CURLOPT_HSTSREADDATA 642 643Pass pointer to the HSTS read callback. See CURLOPT_HSTSREADDATA(3) 644 645## CURLOPT_HSTSWRITEFUNCTION 646 647Set HSTS write callback. See CURLOPT_HSTSWRITEFUNCTION(3) 648 649## CURLOPT_HSTSWRITEDATA 650 651Pass pointer to the HSTS write callback. See CURLOPT_HSTSWRITEDATA(3) 652 653## CURLOPT_HTTPGET 654 655Do an HTTP GET request. See CURLOPT_HTTPGET(3) 656 657## CURLOPT_REQUEST_TARGET 658 659Set the request target. CURLOPT_REQUEST_TARGET(3) 660 661## CURLOPT_HTTP_VERSION 662 663HTTP version to use. CURLOPT_HTTP_VERSION(3) 664 665## CURLOPT_HTTP09_ALLOWED 666 667Allow HTTP/0.9 responses. CURLOPT_HTTP09_ALLOWED(3) 668 669## CURLOPT_IGNORE_CONTENT_LENGTH 670 671Ignore Content-Length. See CURLOPT_IGNORE_CONTENT_LENGTH(3) 672 673## CURLOPT_HTTP_CONTENT_DECODING 674 675Disable Content decoding. See CURLOPT_HTTP_CONTENT_DECODING(3) 676 677## CURLOPT_HTTP_TRANSFER_DECODING 678 679Disable Transfer decoding. See CURLOPT_HTTP_TRANSFER_DECODING(3) 680 681## CURLOPT_EXPECT_100_TIMEOUT_MS 682 683100-continue timeout. See CURLOPT_EXPECT_100_TIMEOUT_MS(3) 684 685## CURLOPT_TRAILERFUNCTION 686 687Set callback for sending trailing headers. See 688CURLOPT_TRAILERFUNCTION(3) 689 690## CURLOPT_TRAILERDATA 691 692Custom pointer passed to the trailing headers callback. See 693CURLOPT_TRAILERDATA(3) 694 695## CURLOPT_PIPEWAIT 696 697Wait on connection to pipeline on it. See CURLOPT_PIPEWAIT(3) 698 699## CURLOPT_STREAM_DEPENDS 700 701This HTTP/2 stream depends on another. See CURLOPT_STREAM_DEPENDS(3) 702 703## CURLOPT_STREAM_DEPENDS_E 704 705This HTTP/2 stream depends on another exclusively. See 706CURLOPT_STREAM_DEPENDS_E(3) 707 708## CURLOPT_STREAM_WEIGHT 709 710Set this HTTP/2 stream's weight. See CURLOPT_STREAM_WEIGHT(3) 711 712# SMTP OPTIONS 713 714## CURLOPT_MAIL_FROM 715 716Address of the sender. See CURLOPT_MAIL_FROM(3) 717 718## CURLOPT_MAIL_RCPT 719 720Address of the recipients. See CURLOPT_MAIL_RCPT(3) 721 722## CURLOPT_MAIL_AUTH 723 724Authentication address. See CURLOPT_MAIL_AUTH(3) 725 726## CURLOPT_MAIL_RCPT_ALLOWFAILS 727 728Allow RCPT TO command to fail for some recipients. See 729CURLOPT_MAIL_RCPT_ALLOWFAILS(3) 730 731# TFTP OPTIONS 732 733## CURLOPT_TFTP_BLKSIZE 734 735TFTP block size. See CURLOPT_TFTP_BLKSIZE(3) 736 737## CURLOPT_TFTP_NO_OPTIONS 738 739Do not send TFTP options requests. See CURLOPT_TFTP_NO_OPTIONS(3) 740 741# FTP OPTIONS 742 743## CURLOPT_FTPPORT 744 745Use active FTP. See CURLOPT_FTPPORT(3) 746 747## CURLOPT_QUOTE 748 749Commands to run before transfer. See CURLOPT_QUOTE(3) 750 751## CURLOPT_POSTQUOTE 752 753Commands to run after transfer. See CURLOPT_POSTQUOTE(3) 754 755## CURLOPT_PREQUOTE 756 757Commands to run just before transfer. See CURLOPT_PREQUOTE(3) 758 759## CURLOPT_APPEND 760 761Append to remote file. See CURLOPT_APPEND(3) 762 763## CURLOPT_FTP_USE_EPRT 764 765Use EPRT. See CURLOPT_FTP_USE_EPRT(3) 766 767## CURLOPT_FTP_USE_EPSV 768 769Use EPSV. See CURLOPT_FTP_USE_EPSV(3) 770 771## CURLOPT_FTP_USE_PRET 772 773Use PRET. See CURLOPT_FTP_USE_PRET(3) 774 775## CURLOPT_FTP_CREATE_MISSING_DIRS 776 777Create missing directories on the remote server. See CURLOPT_FTP_CREATE_MISSING_DIRS(3) 778 779## CURLOPT_SERVER_RESPONSE_TIMEOUT 780 781Timeout for server responses. See CURLOPT_SERVER_RESPONSE_TIMEOUT(3) 782 783## CURLOPT_SERVER_RESPONSE_TIMEOUT_MS 784 785Timeout for server responses. See CURLOPT_SERVER_RESPONSE_TIMEOUT_MS(3) 786 787## CURLOPT_FTP_ALTERNATIVE_TO_USER 788 789Alternative to USER. See CURLOPT_FTP_ALTERNATIVE_TO_USER(3) 790 791## CURLOPT_FTP_SKIP_PASV_IP 792 793Ignore the IP address in the PASV response. See CURLOPT_FTP_SKIP_PASV_IP(3) 794 795## CURLOPT_FTPSSLAUTH 796 797Control how to do TLS. See CURLOPT_FTPSSLAUTH(3) 798 799## CURLOPT_FTP_SSL_CCC 800 801Back to non-TLS again after authentication. See CURLOPT_FTP_SSL_CCC(3) 802 803## CURLOPT_FTP_ACCOUNT 804 805Send ACCT command. See CURLOPT_FTP_ACCOUNT(3) 806 807## CURLOPT_FTP_FILEMETHOD 808 809Specify how to reach files. See CURLOPT_FTP_FILEMETHOD(3) 810 811# RTSP OPTIONS 812 813## CURLOPT_RTSP_REQUEST 814 815RTSP request. See CURLOPT_RTSP_REQUEST(3) 816 817## CURLOPT_RTSP_SESSION_ID 818 819RTSP session-id. See CURLOPT_RTSP_SESSION_ID(3) 820 821## CURLOPT_RTSP_STREAM_URI 822 823RTSP stream URI. See CURLOPT_RTSP_STREAM_URI(3) 824 825## CURLOPT_RTSP_TRANSPORT 826 827RTSP Transport: header. See CURLOPT_RTSP_TRANSPORT(3) 828 829## CURLOPT_RTSP_CLIENT_CSEQ 830 831Client CSEQ number. See CURLOPT_RTSP_CLIENT_CSEQ(3) 832 833## CURLOPT_RTSP_SERVER_CSEQ 834 835CSEQ number for RTSP Server-\>Client request. See CURLOPT_RTSP_SERVER_CSEQ(3) 836 837## CURLOPT_AWS_SIGV4 838 839AWS HTTP V4 Signature. See CURLOPT_AWS_SIGV4(3) 840 841# PROTOCOL OPTIONS 842 843## CURLOPT_TRANSFERTEXT 844 845Use text transfer. See CURLOPT_TRANSFERTEXT(3) 846 847## CURLOPT_PROXY_TRANSFER_MODE 848 849Add transfer mode to URL over proxy. See CURLOPT_PROXY_TRANSFER_MODE(3) 850 851## CURLOPT_CRLF 852 853Convert newlines. See CURLOPT_CRLF(3) 854 855## CURLOPT_RANGE 856 857Range requests. See CURLOPT_RANGE(3) 858 859## CURLOPT_RESUME_FROM 860 861Resume a transfer. See CURLOPT_RESUME_FROM(3) 862 863## CURLOPT_RESUME_FROM_LARGE 864 865Resume a transfer. See CURLOPT_RESUME_FROM_LARGE(3) 866 867## CURLOPT_CURLU 868 869Set URL to work on with a URL handle. See CURLOPT_CURLU(3) 870 871## CURLOPT_CUSTOMREQUEST 872 873Custom request/method. See CURLOPT_CUSTOMREQUEST(3) 874 875## CURLOPT_FILETIME 876 877Request file modification date and time. See CURLOPT_FILETIME(3) 878 879## CURLOPT_DIRLISTONLY 880 881List only. See CURLOPT_DIRLISTONLY(3) 882 883## CURLOPT_NOBODY 884 885Do not get the body contents. See CURLOPT_NOBODY(3) 886 887## CURLOPT_INFILESIZE 888 889Size of file to send. CURLOPT_INFILESIZE(3) 890 891## CURLOPT_INFILESIZE_LARGE 892 893Size of file to send. CURLOPT_INFILESIZE_LARGE(3) 894 895## CURLOPT_UPLOAD 896 897Upload data. See CURLOPT_UPLOAD(3) 898 899## CURLOPT_UPLOAD_BUFFERSIZE 900 901Set upload buffer size. See CURLOPT_UPLOAD_BUFFERSIZE(3) 902 903## CURLOPT_MIMEPOST 904 905Post/send MIME data. See CURLOPT_MIMEPOST(3) 906 907## CURLOPT_MIME_OPTIONS 908 909Set MIME option flags. See CURLOPT_MIME_OPTIONS(3) 910 911## CURLOPT_MAXFILESIZE 912 913Maximum file size to get. See CURLOPT_MAXFILESIZE(3) 914 915## CURLOPT_MAXFILESIZE_LARGE 916 917Maximum file size to get. See CURLOPT_MAXFILESIZE_LARGE(3) 918 919## CURLOPT_TIMECONDITION 920 921Make a time conditional request. See CURLOPT_TIMECONDITION(3) 922 923## CURLOPT_TIMEVALUE 924 925Time value for the time conditional request. See CURLOPT_TIMEVALUE(3) 926 927## CURLOPT_TIMEVALUE_LARGE 928 929Time value for the time conditional request. See CURLOPT_TIMEVALUE_LARGE(3) 930 931# CONNECTION OPTIONS 932 933## CURLOPT_TIMEOUT 934 935Timeout for the entire request. See CURLOPT_TIMEOUT(3) 936 937## CURLOPT_TIMEOUT_MS 938 939Millisecond timeout for the entire request. See CURLOPT_TIMEOUT_MS(3) 940 941## CURLOPT_LOW_SPEED_LIMIT 942 943Low speed limit to abort transfer. See CURLOPT_LOW_SPEED_LIMIT(3) 944 945## CURLOPT_LOW_SPEED_TIME 946 947Time to be below the speed to trigger low speed abort. See CURLOPT_LOW_SPEED_TIME(3) 948 949## CURLOPT_MAX_SEND_SPEED_LARGE 950 951Cap the upload speed to this. See CURLOPT_MAX_SEND_SPEED_LARGE(3) 952 953## CURLOPT_MAX_RECV_SPEED_LARGE 954 955Cap the download speed to this. See CURLOPT_MAX_RECV_SPEED_LARGE(3) 956 957## CURLOPT_MAXCONNECTS 958 959Maximum number of connections in the connection pool. See CURLOPT_MAXCONNECTS(3) 960 961## CURLOPT_FRESH_CONNECT 962 963Use a new connection. CURLOPT_FRESH_CONNECT(3) 964 965## CURLOPT_FORBID_REUSE 966 967Prevent subsequent connections from reusing this. See CURLOPT_FORBID_REUSE(3) 968 969## CURLOPT_MAXAGE_CONN 970 971Limit the age (idle time) of connections for reuse. See CURLOPT_MAXAGE_CONN(3) 972 973## CURLOPT_MAXLIFETIME_CONN 974 975Limit the age (since creation) of connections for reuse. See 976CURLOPT_MAXLIFETIME_CONN(3) 977 978## CURLOPT_CONNECTTIMEOUT 979 980Timeout for the connection phase. See CURLOPT_CONNECTTIMEOUT(3) 981 982## CURLOPT_CONNECTTIMEOUT_MS 983 984Millisecond timeout for the connection phase. See CURLOPT_CONNECTTIMEOUT_MS(3) 985 986## CURLOPT_IPRESOLVE 987 988IP version to use. See CURLOPT_IPRESOLVE(3) 989 990## CURLOPT_CONNECT_ONLY 991 992Only connect, nothing else. See CURLOPT_CONNECT_ONLY(3) 993 994## CURLOPT_USE_SSL 995 996Use TLS/SSL. See CURLOPT_USE_SSL(3) 997 998## CURLOPT_RESOLVE 999 1000Provide fixed/fake name resolves. See CURLOPT_RESOLVE(3) 1001 1002## CURLOPT_DNS_INTERFACE 1003 1004Bind name resolves to this interface. See CURLOPT_DNS_INTERFACE(3) 1005 1006## CURLOPT_DNS_LOCAL_IP4 1007 1008Bind name resolves to this IP4 address. See CURLOPT_DNS_LOCAL_IP4(3) 1009 1010## CURLOPT_DNS_LOCAL_IP6 1011 1012Bind name resolves to this IP6 address. See CURLOPT_DNS_LOCAL_IP6(3) 1013 1014## CURLOPT_DNS_SERVERS 1015 1016Preferred DNS servers. See CURLOPT_DNS_SERVERS(3) 1017 1018## CURLOPT_DNS_SHUFFLE_ADDRESSES 1019 1020Shuffle addresses before use. See CURLOPT_DNS_SHUFFLE_ADDRESSES(3) 1021 1022## CURLOPT_ACCEPTTIMEOUT_MS 1023 1024Timeout for waiting for the server's connect back to be accepted. See 1025CURLOPT_ACCEPTTIMEOUT_MS(3) 1026 1027## CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS 1028 1029Timeout for happy eyeballs. See CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS(3) 1030 1031## CURLOPT_UPKEEP_INTERVAL_MS 1032 1033Sets the interval at which connection upkeep are performed. See 1034CURLOPT_UPKEEP_INTERVAL_MS(3) 1035 1036# SSL and SECURITY OPTIONS 1037 1038## CURLOPT_SSLCERT 1039 1040Client cert. See CURLOPT_SSLCERT(3) 1041 1042## CURLOPT_SSLCERT_BLOB 1043 1044Client cert memory buffer. See CURLOPT_SSLCERT_BLOB(3) 1045 1046## CURLOPT_PROXY_SSLCERT 1047 1048Proxy client cert. See CURLOPT_PROXY_SSLCERT(3) 1049 1050## CURLOPT_PROXY_SSLCERT_BLOB 1051 1052Proxy client cert memory buffer. See CURLOPT_PROXY_SSLCERT_BLOB(3) 1053 1054## CURLOPT_SSLCERTTYPE 1055 1056Client cert type. See CURLOPT_SSLCERTTYPE(3) 1057 1058## CURLOPT_PROXY_SSLCERTTYPE 1059 1060Proxy client cert type. See CURLOPT_PROXY_SSLCERTTYPE(3) 1061 1062## CURLOPT_SSLKEY 1063 1064Client key. See CURLOPT_SSLKEY(3) 1065 1066## CURLOPT_SSLKEY_BLOB 1067 1068Client key memory buffer. See CURLOPT_SSLKEY_BLOB(3) 1069 1070## CURLOPT_PROXY_SSLKEY 1071 1072Proxy client key. See CURLOPT_PROXY_SSLKEY(3) 1073 1074## CURLOPT_PROXY_SSLKEY_BLOB 1075 1076Proxy client key. See CURLOPT_PROXY_SSLKEY_BLOB(3) 1077 1078## CURLOPT_SSLKEYTYPE 1079 1080Client key type. See CURLOPT_SSLKEYTYPE(3) 1081 1082## CURLOPT_PROXY_SSLKEYTYPE 1083 1084Proxy client key type. See CURLOPT_PROXY_SSLKEYTYPE(3) 1085 1086## CURLOPT_KEYPASSWD 1087 1088Client key password. See CURLOPT_KEYPASSWD(3) 1089 1090## CURLOPT_PROXY_KEYPASSWD 1091 1092Proxy client key password. See CURLOPT_PROXY_KEYPASSWD(3) 1093 1094## CURLOPT_SSL_EC_CURVES 1095 1096Set key exchange curves. See CURLOPT_SSL_EC_CURVES(3) 1097 1098## CURLOPT_SSL_ENABLE_ALPN 1099 1100Enable use of ALPN. See CURLOPT_SSL_ENABLE_ALPN(3) 1101 1102## CURLOPT_SSL_ENABLE_NPN 1103 1104**OBSOLETE** Enable use of NPN. See CURLOPT_SSL_ENABLE_NPN(3) 1105 1106## CURLOPT_SSLENGINE 1107 1108Use identifier with SSL engine. See CURLOPT_SSLENGINE(3) 1109 1110## CURLOPT_SSLENGINE_DEFAULT 1111 1112Default SSL engine. See CURLOPT_SSLENGINE_DEFAULT(3) 1113 1114## CURLOPT_SSL_FALSESTART 1115 1116Enable TLS False Start. See CURLOPT_SSL_FALSESTART(3) 1117 1118## CURLOPT_SSLVERSION 1119 1120SSL version to use. See CURLOPT_SSLVERSION(3) 1121 1122## CURLOPT_PROXY_SSLVERSION 1123 1124Proxy SSL version to use. See CURLOPT_PROXY_SSLVERSION(3) 1125 1126## CURLOPT_SSL_VERIFYHOST 1127 1128Verify the hostname in the SSL certificate. See CURLOPT_SSL_VERIFYHOST(3) 1129 1130## CURLOPT_DOH_SSL_VERIFYHOST 1131 1132Verify the hostname in the DoH (DNS-over-HTTPS) SSL certificate. See 1133CURLOPT_DOH_SSL_VERIFYHOST(3) 1134 1135## CURLOPT_PROXY_SSL_VERIFYHOST 1136 1137Verify the hostname in the proxy SSL certificate. See 1138CURLOPT_PROXY_SSL_VERIFYHOST(3) 1139 1140## CURLOPT_SSL_VERIFYPEER 1141 1142Verify the SSL certificate. See CURLOPT_SSL_VERIFYPEER(3) 1143 1144## CURLOPT_DOH_SSL_VERIFYPEER 1145 1146Verify the DoH (DNS-over-HTTPS) SSL certificate. See 1147CURLOPT_DOH_SSL_VERIFYPEER(3) 1148 1149## CURLOPT_PROXY_SSL_VERIFYPEER 1150 1151Verify the proxy SSL certificate. See CURLOPT_PROXY_SSL_VERIFYPEER(3) 1152 1153## CURLOPT_SSL_VERIFYSTATUS 1154 1155Verify the SSL certificate's status. See CURLOPT_SSL_VERIFYSTATUS(3) 1156 1157## CURLOPT_DOH_SSL_VERIFYSTATUS 1158 1159Verify the DoH (DNS-over-HTTPS) SSL certificate's status. See 1160CURLOPT_DOH_SSL_VERIFYSTATUS(3) 1161 1162## CURLOPT_CAINFO 1163 1164CA cert bundle. See CURLOPT_CAINFO(3) 1165 1166## CURLOPT_CAINFO_BLOB 1167 1168CA cert bundle memory buffer. See CURLOPT_CAINFO_BLOB(3) 1169 1170## CURLOPT_PROXY_CAINFO 1171 1172Proxy CA cert bundle. See CURLOPT_PROXY_CAINFO(3) 1173 1174## CURLOPT_PROXY_CAINFO_BLOB 1175 1176Proxy CA cert bundle memory buffer. See CURLOPT_PROXY_CAINFO_BLOB(3) 1177 1178## CURLOPT_ISSUERCERT 1179 1180Issuer certificate. See CURLOPT_ISSUERCERT(3) 1181 1182## CURLOPT_ISSUERCERT_BLOB 1183 1184Issuer certificate memory buffer. See CURLOPT_ISSUERCERT_BLOB(3) 1185 1186## CURLOPT_PROXY_ISSUERCERT 1187 1188Proxy issuer certificate. See CURLOPT_PROXY_ISSUERCERT(3) 1189 1190## CURLOPT_PROXY_ISSUERCERT_BLOB 1191 1192Proxy issuer certificate memory buffer. See CURLOPT_PROXY_ISSUERCERT_BLOB(3) 1193 1194## CURLOPT_CAPATH 1195 1196Path to CA cert bundle. See CURLOPT_CAPATH(3) 1197 1198## CURLOPT_PROXY_CAPATH 1199 1200Path to proxy CA cert bundle. See CURLOPT_PROXY_CAPATH(3) 1201 1202## CURLOPT_CRLFILE 1203 1204Certificate Revocation List. See CURLOPT_CRLFILE(3) 1205 1206## CURLOPT_PROXY_CRLFILE 1207 1208Proxy Certificate Revocation List. See CURLOPT_PROXY_CRLFILE(3) 1209 1210## CURLOPT_CA_CACHE_TIMEOUT 1211 1212Timeout for CA cache. See CURLOPT_CA_CACHE_TIMEOUT(3) 1213 1214## CURLOPT_CERTINFO 1215 1216Extract certificate info. See CURLOPT_CERTINFO(3) 1217 1218## CURLOPT_PINNEDPUBLICKEY 1219 1220Set pinned SSL public key . See CURLOPT_PINNEDPUBLICKEY(3) 1221 1222## CURLOPT_PROXY_PINNEDPUBLICKEY 1223 1224Set the proxy's pinned SSL public key. See 1225CURLOPT_PROXY_PINNEDPUBLICKEY(3) 1226 1227## CURLOPT_RANDOM_FILE 1228 1229**OBSOLETE** Provide source for entropy random data. 1230See CURLOPT_RANDOM_FILE(3) 1231 1232## CURLOPT_EGDSOCKET 1233 1234**OBSOLETE** Identify EGD socket for entropy. See CURLOPT_EGDSOCKET(3) 1235 1236## CURLOPT_SSL_CIPHER_LIST 1237 1238Ciphers to use. See CURLOPT_SSL_CIPHER_LIST(3) 1239 1240## CURLOPT_PROXY_SSL_CIPHER_LIST 1241 1242Proxy ciphers to use. See CURLOPT_PROXY_SSL_CIPHER_LIST(3) 1243 1244## CURLOPT_TLS13_CIPHERS 1245 1246TLS 1.3 cipher suites to use. See CURLOPT_TLS13_CIPHERS(3) 1247 1248## CURLOPT_PROXY_TLS13_CIPHERS 1249 1250Proxy TLS 1.3 cipher suites to use. See CURLOPT_PROXY_TLS13_CIPHERS(3) 1251 1252## CURLOPT_SSL_SESSIONID_CACHE 1253 1254Disable SSL session-id cache. See CURLOPT_SSL_SESSIONID_CACHE(3) 1255 1256## CURLOPT_SSL_OPTIONS 1257 1258Control SSL behavior. See CURLOPT_SSL_OPTIONS(3) 1259 1260## CURLOPT_PROXY_SSL_OPTIONS 1261 1262Control proxy SSL behavior. See CURLOPT_PROXY_SSL_OPTIONS(3) 1263 1264## CURLOPT_KRBLEVEL 1265 1266Kerberos security level. See CURLOPT_KRBLEVEL(3) 1267 1268## CURLOPT_GSSAPI_DELEGATION 1269 1270Disable GSS-API delegation. See CURLOPT_GSSAPI_DELEGATION(3) 1271 1272# SSH OPTIONS 1273 1274## CURLOPT_SSH_AUTH_TYPES 1275 1276SSH authentication types. See CURLOPT_SSH_AUTH_TYPES(3) 1277 1278## CURLOPT_SSH_COMPRESSION 1279 1280Enable SSH compression. See CURLOPT_SSH_COMPRESSION(3) 1281 1282## CURLOPT_SSH_HOST_PUBLIC_KEY_MD5 1283 1284MD5 of host's public key. See CURLOPT_SSH_HOST_PUBLIC_KEY_MD5(3) 1285 1286## CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256 1287 1288SHA256 of host's public key. See CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256(3) 1289 1290## CURLOPT_SSH_PUBLIC_KEYFILE 1291 1292Filename of the public key. See CURLOPT_SSH_PUBLIC_KEYFILE(3) 1293 1294## CURLOPT_SSH_PRIVATE_KEYFILE 1295 1296Filename of the private key. See CURLOPT_SSH_PRIVATE_KEYFILE(3) 1297 1298## CURLOPT_SSH_KNOWNHOSTS 1299 1300Filename with known hosts. See CURLOPT_SSH_KNOWNHOSTS(3) 1301 1302## CURLOPT_SSH_KEYFUNCTION 1303 1304Callback for known hosts handling. See CURLOPT_SSH_KEYFUNCTION(3) 1305 1306## CURLOPT_SSH_KEYDATA 1307 1308Custom pointer to pass to ssh key callback. See CURLOPT_SSH_KEYDATA(3) 1309 1310## CURLOPT_SSH_HOSTKEYFUNCTION 1311 1312Callback for checking host key handling. See CURLOPT_SSH_HOSTKEYFUNCTION(3) 1313 1314## CURLOPT_SSH_HOSTKEYDATA 1315 1316Custom pointer to pass to ssh host key callback. See CURLOPT_SSH_HOSTKEYDATA(3) 1317 1318# WEBSOCKET 1319 1320## CURLOPT_WS_OPTIONS 1321 1322Set WebSocket options. See CURLOPT_WS_OPTIONS(3) 1323 1324# OTHER OPTIONS 1325 1326## CURLOPT_PRIVATE 1327 1328Private pointer to store. See CURLOPT_PRIVATE(3) 1329 1330## CURLOPT_SHARE 1331 1332Share object to use. See CURLOPT_SHARE(3) 1333 1334## CURLOPT_NEW_FILE_PERMS 1335 1336Mode for creating new remote files. See CURLOPT_NEW_FILE_PERMS(3) 1337 1338## CURLOPT_NEW_DIRECTORY_PERMS 1339 1340Mode for creating new remote directories. See CURLOPT_NEW_DIRECTORY_PERMS(3) 1341 1342## CURLOPT_QUICK_EXIT 1343 1344To be set by toplevel tools like "curl" to skip lengthy cleanups when they are 1345about to call exit() anyway. See CURLOPT_QUICK_EXIT(3) 1346 1347# TELNET OPTIONS 1348 1349## CURLOPT_TELNETOPTIONS 1350 1351TELNET options. See CURLOPT_TELNETOPTIONS(3) 1352 1353# EXAMPLE 1354 1355~~~c 1356int main(void) 1357{ 1358 CURL *curl = curl_easy_init(); 1359 if(curl) { 1360 CURLcode res; 1361 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); 1362 res = curl_easy_perform(curl); 1363 curl_easy_cleanup(curl); 1364 } 1365} 1366~~~ 1367 1368# ENCRYPTED CLIENT HELLO OPTIONS 1369 1370## CURLOPT_ECH 1371 1372Set the configuration for ECH. See CURLOPT_ECH(3) 1373 1374# AVAILABILITY 1375 1376Always 1377 1378# RETURN VALUE 1379 1380*CURLE_OK* (zero) means that the option was set properly, non-zero means an 1381error occurred as *\<curl/curl.h\>* defines. See the libcurl-errors(3) man 1382page for the full list with descriptions. 1383 1384Strings passed on to libcurl must be shorter than 8000000 bytes, otherwise 1385curl_easy_setopt(3) returns **CURLE_BAD_FUNCTION_ARGUMENT** (added in 7.65.0). 1386 1387**CURLE_BAD_FUNCTION_ARGUMENT** is returned when the argument to an option is 1388invalid, like perhaps out of range. 1389 1390If you try to set an option that libcurl does not know about, perhaps because 1391the library is too old to support it or the option was removed in a recent 1392version, this function returns *CURLE_UNKNOWN_OPTION*. If support for the 1393option was disabled at compile-time, it returns *CURLE_NOT_BUILT_IN*. 1394
