curl_easy_setopt man page

## NAME

curl_easy_setopt - set options for a curl easy handle

## SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLoption option, parameter);

## DESCRIPTION

curl_easy_setopt 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 option followed by a parameter. That parameter can be a long, a function pointer, an object pointer or a curl_off_t, 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 curl_easy_setopt calls in the setup phase.

Options set with this function call are valid for all forthcoming transfers performed using this handle. 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 curl_easy_reset.

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 curl_easy_setopt returns. The only exception to this rule is really CURLOPT_POSTFIELDS(3), but the alternative that copies the string CURLOPT_COPYPOSTFIELDS(3) 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 handle is the return code from a curl_easy_init or curl_easy_duphandle call.

## BEHAVIOR OPTIONS

CURLOPT_VERBOSE

Display verbose information. See CURLOPT_VERBOSE(3)

CURLOPT_HEADER

Include the header in the body output. See CURLOPT_HEADER(3)

CURLOPT_NOPROGRESS

Shut off the progress meter. See CURLOPT_NOPROGRESS(3)

CURLOPT_NOSIGNAL

Do not install signal handlers. See CURLOPT_NOSIGNAL(3)

CURLOPT_WILDCARDMATCH

Transfer multiple files according to a file name pattern. See CURLOPT_WILDCARDMATCH(3)

## CALLBACK OPTIONS

CURLOPT_WRITEFUNCTION

Callback for writing data. See CURLOPT_WRITEFUNCTION(3)

CURLOPT_WRITEDATA

Data pointer to pass to the write callback. See CURLOPT_WRITEDATA(3)

CURLOPT_READFUNCTION

Callback for reading data. See CURLOPT_READFUNCTION(3)

CURLOPT_READDATA

Data pointer to pass to the read callback. See CURLOPT_READDATA(3)

CURLOPT_IOCTLFUNCTION

Callback for I/O operations. See CURLOPT_IOCTLFUNCTION(3)

CURLOPT_IOCTLDATA

Data pointer to pass to the I/O callback. See CURLOPT_IOCTLDATA(3)

CURLOPT_SEEKFUNCTION

Callback for seek operations. See CURLOPT_SEEKFUNCTION(3)

CURLOPT_SEEKDATA

Data pointer to pass to the seek callback. See CURLOPT_SEEKDATA(3)

CURLOPT_SOCKOPTFUNCTION

Callback for sockopt operations. See CURLOPT_SOCKOPTFUNCTION(3)

CURLOPT_SOCKOPTDATA

Data pointer to pass to the sockopt callback. See CURLOPT_SOCKOPTDATA(3)

CURLOPT_OPENSOCKETFUNCTION

Callback for socket creation. See CURLOPT_OPENSOCKETFUNCTION(3)

CURLOPT_OPENSOCKETDATA

Data pointer to pass to the open socket callback. See CURLOPT_OPENSOCKETDATA(3)

CURLOPT_CLOSESOCKETFUNCTION

Callback for closing socket. See CURLOPT_CLOSESOCKETFUNCTION(3)

CURLOPT_CLOSESOCKETDATA

Data pointer to pass to the close socket callback. See CURLOPT_CLOSESOCKETDATA(3)

CURLOPT_PROGRESSFUNCTION

OBSOLETE callback for progress meter. See CURLOPT_PROGRESSFUNCTION(3)

CURLOPT_PROGRESSDATA

Data pointer to pass to the progress meter callback. See CURLOPT_PROGRESSDATA(3)

CURLOPT_XFERINFOFUNCTION

Callback for progress meter. See CURLOPT_XFERINFOFUNCTION(3)

CURLOPT_XFERINFODATA

Data pointer to pass to the progress meter callback. See CURLOPT_XFERINFODATA(3)

CURLOPT_HEADERFUNCTION

Callback for writing received headers. See CURLOPT_HEADERFUNCTION(3)

CURLOPT_HEADERDATA

Data pointer to pass to the header callback. See CURLOPT_HEADERDATA(3)

CURLOPT_DEBUGFUNCTION

Callback for debug information. See CURLOPT_DEBUGFUNCTION(3)

CURLOPT_DEBUGDATA

Data pointer to pass to the debug callback. See CURLOPT_DEBUGDATA(3)

CURLOPT_SSL_CTX_FUNCTION

Callback for SSL context logic. See CURLOPT_SSL_CTX_FUNCTION(3)

CURLOPT_SSL_CTX_DATA

Data pointer to pass to the SSL context callback. See CURLOPT_SSL_CTX_DATA(3)

CURLOPT_CONV_TO_NETWORK_FUNCTION

Callback for code base conversion. See CURLOPT_CONV_TO_NETWORK_FUNCTION(3)

CURLOPT_CONV_FROM_NETWORK_FUNCTION

Callback for code base conversion. See CURLOPT_CONV_FROM_NETWORK_FUNCTION(3)

CURLOPT_CONV_FROM_UTF8_FUNCTION

Callback for code base conversion. See CURLOPT_CONV_FROM_UTF8_FUNCTION(3)

CURLOPT_INTERLEAVEFUNCTION

Callback for RTSP interleaved data. See CURLOPT_INTERLEAVEFUNCTION(3)

CURLOPT_INTERLEAVEDATA

Data pointer to pass to the RTSP interleave callback. See CURLOPT_INTERLEAVEDATA(3)

CURLOPT_CHUNK_BGN_FUNCTION

Callback for wildcard download start of chunk. See CURLOPT_CHUNK_BGN_FUNCTION(3)

CURLOPT_CHUNK_END_FUNCTION

Callback for wildcard download end of chunk. See CURLOPT_CHUNK_END_FUNCTION(3)

CURLOPT_CHUNK_DATA

Data pointer to pass to the chunk callbacks. See CURLOPT_CHUNK_DATA(3)

CURLOPT_FNMATCH_FUNCTION

Callback for wildcard matching. See CURLOPT_FNMATCH_FUNCTION(3)

CURLOPT_FNMATCH_DATA

Data pointer to pass to the wildcard matching callback. See CURLOPT_FNMATCH_DATA(3)

## ERROR OPTIONS

CURLOPT_ERRORBUFFER

Error message buffer. See CURLOPT_ERRORBUFFER(3)

CURLOPT_STDERR

stderr replacement stream. See CURLOPT_STDERR(3)

CURLOPT_FAILONERROR

Fail on HTTP 4xx errors. CURLOPT_FAILONERROR(3)

## NETWORK OPTIONS

CURLOPT_URL

URL to work on. See CURLOPT_URL(3)

CURLOPT_PATH_AS_IS

Disable squashing /../ and /./ sequences in the path. See CURLOPT_PATH_AS_IS(3)

CURLOPT_PROTOCOLS

Allowed protocols. See CURLOPT_PROTOCOLS(3)

CURLOPT_REDIR_PROTOCOLS

Protocols to allow redirects to. See CURLOPT_REDIR_PROTOCOLS(3)

CURLOPT_DEFAULT_PROTOCOL

Default protocol. See CURLOPT_DEFAULT_PROTOCOL(3)

CURLOPT_PROXY

Proxy to use. See CURLOPT_PROXY(3)

CURLOPT_PROXYPORT

Proxy port to use. See CURLOPT_PROXYPORT(3)

CURLOPT_PROXYTYPE

Proxy type. See CURLOPT_PROXYTYPE(3)

CURLOPT_NOPROXY

Filter out hosts from proxy use. CURLOPT_NOPROXY(3)

CURLOPT_HTTPPROXYTUNNEL

Tunnel through the HTTP proxy. CURLOPT_HTTPPROXYTUNNEL(3)

CURLOPT_CONNECT_TO

Connect to a specific host and port. See CURLOPT_CONNECT_TO(3)

CURLOPT_SOCKS5_GSSAPI_SERVICE

Socks5 GSSAPI service name. CURLOPT_SOCKS5_GSSAPI_SERVICE(3)

CURLOPT_SOCKS5_GSSAPI_NEC

Socks5 GSSAPI NEC mode. See CURLOPT_SOCKS5_GSSAPI_NEC(3)

CURLOPT_PROXY_SERVICE_NAME

Proxy authentication service name. CURLOPT_PROXY_SERVICE_NAME(3)

CURLOPT_SERVICE_NAME

Authentication service name. CURLOPT_SERVICE_NAME(3)

CURLOPT_INTERFACE

Bind connection locally to this. See CURLOPT_INTERFACE(3)

CURLOPT_LOCALPORT

Bind connection locally to this port. See CURLOPT_LOCALPORT(3)

CURLOPT_LOCALPORTRANGE

Bind connection locally to port range. See CURLOPT_LOCALPORTRANGE(3)

CURLOPT_DNS_CACHE_TIMEOUT

Timeout for DNS cache. See CURLOPT_DNS_CACHE_TIMEOUT(3)

CURLOPT_DNS_USE_GLOBAL_CACHE

OBSOLETE Enable global DNS cache. See CURLOPT_DNS_USE_GLOBAL_CACHE(3)

CURLOPT_BUFFERSIZE

Ask for smaller buffer size. See CURLOPT_BUFFERSIZE(3)

CURLOPT_PORT

Port number to connect to. See CURLOPT_PORT(3)

CURLOPT_TCP_FASTOPEN

Enable TFO, TCP Fast Open. See CURLOPT_TCP_FASTOPEN(3)

CURLOPT_TCP_NODELAY

Disable the Nagle algorithm. See CURLOPT_TCP_NODELAY(3)

CURLOPT_ADDRESS_SCOPE

IPv6 scope for local addresses. See CURLOPT_ADDRESS_SCOPE(3)

CURLOPT_TCP_KEEPALIVE

Enable TCP keep-alive. See CURLOPT_TCP_KEEPALIVE(3)

CURLOPT_TCP_KEEPIDLE

Idle time before sending keep-alive. See CURLOPT_TCP_KEEPIDLE(3)

CURLOPT_TCP_KEEPINTVL

Interval between keep-alive probes. See CURLOPT_TCP_KEEPINTVL(3)

CURLOPT_UNIX_SOCKET_PATH

Path to a Unix domain socket. See CURLOPT_UNIX_SOCKET_PATH(3)

## NAMES and PASSWORDS OPTIONS (Authentication)

CURLOPT_NETRC

Enable .netrc parsing. See CURLOPT_NETRC(3)

CURLOPT_NETRC_FILE

.netrc file name. See CURLOPT_NETRC_FILE(3)

CURLOPT_USERPWD

User name and password. See CURLOPT_USERPWD(3)

CURLOPT_PROXYUSERPWD

Proxy user name and password. See CURLOPT_PROXYUSERPWD(3)

CURLOPT_USERNAME

User name. See CURLOPT_USERNAME(3)

CURLOPT_PASSWORD

Password. See CURLOPT_PASSWORD(3)

CURLOPT_LOGIN_OPTIONS

Login options. See CURLOPT_LOGIN_OPTIONS(3)

CURLOPT_PROXYUSERNAME

Proxy user name. See CURLOPT_PROXYUSERNAME(3)

CURLOPT_PROXYPASSWORD

Proxy password. See CURLOPT_PROXYPASSWORD(3)

CURLOPT_HTTPAUTH

HTTP server authentication methods. See CURLOPT_HTTPAUTH(3)

CURLOPT_TLSAUTH_USERNAME

TLS authentication user name. See CURLOPT_TLSAUTH_USERNAME(3)

CURLOPT_TLSAUTH_PASSWORD

TLS authentication password. See CURLOPT_TLSAUTH_PASSWORD(3)

CURLOPT_TLSAUTH_TYPE

TLS authentication methods. See CURLOPT_TLSAUTH_TYPE(3)

CURLOPT_PROXYAUTH

HTTP proxy authentication methods. See CURLOPT_PROXYAUTH(3)

CURLOPT_SASL_IR

Enable SASL initial response. See CURLOPT_SASL_IR(3)

CURLOPT_XOAUTH2_BEARER

OAuth2 bearer token. See CURLOPT_XOAUTH2_BEARER(3)

## HTTP OPTIONS

CURLOPT_AUTOREFERER

Automatically set Referer: header. See CURLOPT_AUTOREFERER(3)

CURLOPT_ACCEPT_ENCODING

Accept-Encoding and automatic decompressing data. See CURLOPT_ACCEPT_ENCODING(3)

CURLOPT_TRANSFER_ENCODING

Request Transfer-Encoding. See CURLOPT_TRANSFER_ENCODING(3)

CURLOPT_FOLLOWLOCATION

Follow HTTP redirects. See CURLOPT_FOLLOWLOCATION(3)

CURLOPT_UNRESTRICTED_AUTH

Do not restrict authentication to original host. CURLOPT_UNRESTRICTED_AUTH(3)

CURLOPT_MAXREDIRS

Maximum number of redirects to follow. See CURLOPT_MAXREDIRS(3)

CURLOPT_POSTREDIR

How to act on redirects after POST. See CURLOPT_POSTREDIR(3)

CURLOPT_PUT

Issue a HTTP PUT request. See CURLOPT_PUT(3)

CURLOPT_POST

Issue a HTTP POST request. See CURLOPT_POST(3)

CURLOPT_POSTFIELDS

Send a POST with this data. See CURLOPT_POSTFIELDS(3)

CURLOPT_POSTFIELDSIZE

The POST data is this big. See CURLOPT_POSTFIELDSIZE(3)

CURLOPT_POSTFIELDSIZE_LARGE

The POST data is this big. See CURLOPT_POSTFIELDSIZE_LARGE(3)

CURLOPT_COPYPOSTFIELDS

Send a POST with this data - and copy it. See CURLOPT_COPYPOSTFIELDS(3)

CURLOPT_HTTPPOST

Multipart formpost HTTP POST. See CURLOPT_HTTPPOST(3)

CURLOPT_REFERER

Referer: header. See CURLOPT_REFERER(3)

CURLOPT_USERAGENT

User-Agent: header. See CURLOPT_USERAGENT(3)

CURLOPT_HTTPHEADER

Custom HTTP headers. See CURLOPT_HTTPHEADER(3)

CURLOPT_HEADEROPT

Control custom headers. See CURLOPT_HEADEROPT(3)

CURLOPT_PROXYHEADER

Custom HTTP headers sent to proxy. See CURLOPT_PROXYHEADER(3)

CURLOPT_HTTP200ALIASES

Alternative versions of 200 OK. See CURLOPT_HTTP200ALIASES(3)

CURLOPT_COOKIE

Cookie(s) to send. See CURLOPT_COOKIE(3)

CURLOPT_COOKIEFILE

File to read cookies from. See CURLOPT_COOKIEFILE(3)

CURLOPT_COOKIEJAR

File to write cookies to. See CURLOPT_COOKIEJAR(3)

CURLOPT_COOKIESESSION

Start a new cookie session. See CURLOPT_COOKIESESSION(3)

CURLOPT_COOKIELIST

Add or control cookies. See CURLOPT_COOKIELIST(3)

CURLOPT_HTTPGET

Do a HTTP GET request. See CURLOPT_HTTPGET(3)

CURLOPT_HTTP_VERSION

HTTP version to use. CURLOPT_HTTP_VERSION(3)

CURLOPT_IGNORE_CONTENT_LENGTH

Ignore Content-Length. See CURLOPT_IGNORE_CONTENT_LENGTH(3)

CURLOPT_HTTP_CONTENT_DECODING

Disable Content decoding. See CURLOPT_HTTP_CONTENT_DECODING(3)

CURLOPT_HTTP_TRANSFER_DECODING

Disable Transfer decoding. See CURLOPT_HTTP_TRANSFER_DECODING(3)

CURLOPT_EXPECT_100_TIMEOUT_MS

100-continue timeout. See CURLOPT_EXPECT_100_TIMEOUT_MS(3)

CURLOPT_PIPEWAIT

Wait on connection to pipeline on it. See CURLOPT_PIPEWAIT(3)

CURLOPT_STREAM_DEPENDS

This HTTP/2 stream depends on another. See CURLOPT_STREAM_DEPENDS(3)

CURLOPT_STREAM_DEPENDS_E

This HTTP/2 stream depends on another exclusively. See CURLOPT_STREAM_DEPENDS_E(3)

CURLOPT_STREAM_WEIGHT

Set this HTTP/2 stream's weight. See CURLOPT_STREAM_WEIGHT(3)

## SMTP OPTIONS

CURLOPT_MAIL_FROM

Address of the sender. See CURLOPT_MAIL_FROM(3)

CURLOPT_MAIL_RCPT

Address of the recipients. See CURLOPT_MAIL_RCPT(3)

CURLOPT_MAIL_AUTH

Authentication address. See CURLOPT_MAIL_AUTH(3)

## TFTP OPTIONS

CURLOPT_TFTP_BLKSIZE

TFTP block size. See CURLOPT_TFTP_BLKSIZE(3)

CURLOPT_TFTP_NO_OPTIONS

Do not send TFTP options requests. See CURLOPT_TFTP_NO_OPTIONS(3)

## FTP OPTIONS

CURLOPT_FTPPORT

Use active FTP. See CURLOPT_FTPPORT(3)

CURLOPT_QUOTE

Commands to run before transfer. See CURLOPT_QUOTE(3)

CURLOPT_POSTQUOTE

Commands to run after transfer. See CURLOPT_POSTQUOTE(3)

CURLOPT_PREQUOTE

Commands to run just before transfer. See CURLOPT_PREQUOTE(3)

CURLOPT_APPEND

Append to remote file. See CURLOPT_APPEND(3)

CURLOPT_FTP_USE_EPRT

Use EPTR. See CURLOPT_FTP_USE_EPRT(3)

CURLOPT_FTP_USE_EPSV

Use EPSV. See CURLOPT_FTP_USE_EPSV(3)

CURLOPT_FTP_USE_PRET

Use PRET. See CURLOPT_FTP_USE_PRET(3)

CURLOPT_FTP_CREATE_MISSING_DIRS

Create missing directories on the remote server. See CURLOPT_FTP_CREATE_MISSING_DIRS(3)

CURLOPT_FTP_RESPONSE_TIMEOUT

Timeout for FTP responses. See CURLOPT_FTP_RESPONSE_TIMEOUT(3)

CURLOPT_FTP_ALTERNATIVE_TO_USER

Alternative to USER. See CURLOPT_FTP_ALTERNATIVE_TO_USER(3)

CURLOPT_FTP_SKIP_PASV_IP

Ignore the IP address in the PASV response. See CURLOPT_FTP_SKIP_PASV_IP(3)

CURLOPT_FTPSSLAUTH

Control how to do TLS. See CURLOPT_FTPSSLAUTH(3)

CURLOPT_FTP_SSL_CCC

Back to non-TLS again after authentication. See CURLOPT_FTP_SSL_CCC(3)

CURLOPT_FTP_ACCOUNT

Send ACCT command. See CURLOPT_FTP_ACCOUNT(3)

CURLOPT_FTP_FILEMETHOD

Specify how to reach files. See CURLOPT_FTP_FILEMETHOD(3)

## RTSP OPTIONS

CURLOPT_RTSP_REQUEST

RTSP request. See CURLOPT_RTSP_REQUEST(3)

CURLOPT_RTSP_SESSION_ID

RTSP session-id. See CURLOPT_RTSP_SESSION_ID(3)

CURLOPT_RTSP_STREAM_URI

RTSP stream URI. See CURLOPT_RTSP_STREAM_URI(3)

CURLOPT_RTSP_TRANSPORT

RTSP Transport: header. See CURLOPT_RTSP_TRANSPORT(3)

CURLOPT_RTSP_CLIENT_CSEQ

Client CSEQ number. See CURLOPT_RTSP_CLIENT_CSEQ(3)

CURLOPT_RTSP_SERVER_CSEQ

CSEQ number for RTSP Server->Client request. See CURLOPT_RTSP_SERVER_CSEQ(3)

## PROTOCOL OPTIONS

CURLOPT_TRANSFERTEXT

Use text transfer. See CURLOPT_TRANSFERTEXT(3)

CURLOPT_PROXY_TRANSFER_MODE

Add transfer mode to URL over proxy. See CURLOPT_PROXY_TRANSFER_MODE(3)

CURLOPT_CRLF

Convert newlines. See CURLOPT_CRLF(3)

CURLOPT_RANGE

Range requests. See CURLOPT_RANGE(3)

CURLOPT_RESUME_FROM

Resume a transfer. See CURLOPT_RESUME_FROM(3)

CURLOPT_RESUME_FROM_LARGE

Resume a transfer. See CURLOPT_RESUME_FROM_LARGE(3)

CURLOPT_CUSTOMREQUEST

Custom request/method. See CURLOPT_CUSTOMREQUEST(3)

CURLOPT_FILETIME

Request file modification date and time. See CURLOPT_FILETIME(3)

CURLOPT_DIRLISTONLY

List only. See CURLOPT_DIRLISTONLY(3)

CURLOPT_NOBODY

Do not get the body contents. See CURLOPT_NOBODY(3)

CURLOPT_INFILESIZE

Size of file to send. CURLOPT_INFILESIZE(3)

CURLOPT_INFILESIZE_LARGE

Size of file to send. CURLOPT_INFILESIZE_LARGE(3)

CURLOPT_UPLOAD

Upload data. See CURLOPT_UPLOAD(3)

CURLOPT_MAXFILESIZE

Maximum file size to get. See CURLOPT_MAXFILESIZE(3)

CURLOPT_MAXFILESIZE_LARGE

Maximum file size to get. See CURLOPT_MAXFILESIZE_LARGE(3)

CURLOPT_TIMECONDITION

Make a time conditional request. See CURLOPT_TIMECONDITION(3)

CURLOPT_TIMEVALUE

Time value for the time conditional request. See CURLOPT_TIMEVALUE(3)

## CONNECTION OPTIONS

CURLOPT_TIMEOUT

Timeout for the entire request. See CURLOPT_TIMEOUT(3)

CURLOPT_TIMEOUT_MS

Millisecond timeout for the entire request. See CURLOPT_TIMEOUT_MS(3)

CURLOPT_LOW_SPEED_LIMIT

Low speed limit to abort transfer. See CURLOPT_LOW_SPEED_LIMIT(3)

CURLOPT_LOW_SPEED_TIME

Time to be below the speed to trigger low speed abort. See CURLOPT_LOW_SPEED_TIME(3)

CURLOPT_MAX_SEND_SPEED_LARGE

Cap the upload speed to this. See CURLOPT_MAX_SEND_SPEED_LARGE(3)

CURLOPT_MAX_RECV_SPEED_LARGE

Cap the download speed to this. See CURLOPT_MAX_RECV_SPEED_LARGE(3)

CURLOPT_MAXCONNECTS

Maximum number of connections in the connection pool. See CURLOPT_MAXCONNECTS(3)

CURLOPT_FRESH_CONNECT

Use a new connection. CURLOPT_FRESH_CONNECT(3)

CURLOPT_FORBID_REUSE

Prevent subsequent connections from re-using this. See CURLOPT_FORBID_REUSE(3)

CURLOPT_CONNECTTIMEOUT

Timeout for the connection phase. See CURLOPT_CONNECTTIMEOUT(3)

CURLOPT_CONNECTTIMEOUT_MS

Millisecond timeout for the connection phase. See CURLOPT_CONNECTTIMEOUT_MS(3)

CURLOPT_IPRESOLVE

IP version to resolve to. See CURLOPT_IPRESOLVE(3)

CURLOPT_CONNECT_ONLY

Only connect, nothing else. See CURLOPT_CONNECT_ONLY(3)

CURLOPT_USE_SSL

Use TLS/SSL. See CURLOPT_USE_SSL(3)

CURLOPT_RESOLVE

Provide fixed/fake name resolves. See CURLOPT_RESOLVE(3)

CURLOPT_DNS_INTERFACE

Bind name resolves to this interface. See CURLOPT_DNS_INTERFACE(3)

CURLOPT_DNS_LOCAL_IP4

Bind name resolves to this IP4 address. See CURLOPT_DNS_LOCAL_IP4(3)

CURLOPT_DNS_LOCAL_IP6

Bind name resolves to this IP6 address. See CURLOPT_DNS_LOCAL_IP6(3)

CURLOPT_DNS_SERVERS

Preferred DNS servers. See CURLOPT_DNS_SERVERS(3)

CURLOPT_ACCEPTTIMEOUT_MS

Timeout for waiting for the server's connect back to be accepted. See CURLOPT_ACCEPTTIMEOUT_MS(3)

## SSL and SECURITY OPTIONS

CURLOPT_SSLCERT

Client cert. See CURLOPT_SSLCERT(3)

CURLOPT_SSLCERTTYPE

Client cert type. See CURLOPT_SSLCERTTYPE(3)

CURLOPT_SSLKEY

Client key. See CURLOPT_SSLKEY(3)

CURLOPT_SSLKEYTYPE

Client key type. See CURLOPT_SSLKEYTYPE(3)

CURLOPT_KEYPASSWD

Client key password. See CURLOPT_KEYPASSWD(3)

CURLOPT_SSL_ENABLE_ALPN

Enable use of ALPN. See CURLOPT_SSL_ENABLE_ALPN(3)

CURLOPT_SSL_ENABLE_NPN

Enable use of NPN. See CURLOPT_SSL_ENABLE_NPN(3)

CURLOPT_SSLENGINE

Use identifier with SSL engine. See CURLOPT_SSLENGINE(3)

CURLOPT_SSLENGINE_DEFAULT

Default SSL engine. See CURLOPT_SSLENGINE_DEFAULT(3)

CURLOPT_SSL_FALSESTART

Enable TLS False Start. See CURLOPT_SSL_FALSESTART(3)

CURLOPT_SSLVERSION

SSL version to use. See CURLOPT_SSLVERSION(3)

CURLOPT_SSL_VERIFYHOST

Verify the host name in the SSL certificate. See CURLOPT_SSL_VERIFYHOST(3)

CURLOPT_SSL_VERIFYPEER

Verify the SSL certificate. See CURLOPT_SSL_VERIFYPEER(3)

CURLOPT_SSL_VERIFYSTATUS

Verify the SSL certificate's status. See CURLOPT_SSL_VERIFYSTATUS(3)

CURLOPT_CAINFO

CA cert bundle. See CURLOPT_CAINFO(3)

CURLOPT_ISSUERCERT

Issuer certificate. See CURLOPT_ISSUERCERT(3)

CURLOPT_CAPATH

Path to CA cert bundle. See CURLOPT_CAPATH(3)

CURLOPT_CRLFILE

Certificate Revocation List. See CURLOPT_CRLFILE(3)

CURLOPT_CERTINFO

Extract certificate info. See CURLOPT_CERTINFO(3)

CURLOPT_PINNEDPUBLICKEY

Set pinned SSL public key . See CURLOPT_PINNEDPUBLICKEY(3)

CURLOPT_RANDOM_FILE

Provide source for entropy random data. See CURLOPT_RANDOM_FILE(3)

CURLOPT_EGDSOCKET

Identify EGD socket for entropy. See CURLOPT_EGDSOCKET(3)

CURLOPT_SSL_CIPHER_LIST

Ciphers to use. See CURLOPT_SSL_CIPHER_LIST(3)

CURLOPT_SSL_SESSIONID_CACHE

Disable SSL session-id cache. See CURLOPT_SSL_SESSIONID_CACHE(3)

CURLOPT_SSL_OPTIONS

Control SSL behavior. See CURLOPT_SSL_OPTIONS(3)

CURLOPT_KRBLEVEL

Kerberos security level. See CURLOPT_KRBLEVEL(3)

CURLOPT_GSSAPI_DELEGATION

Disable GSS-API delegation. See CURLOPT_GSSAPI_DELEGATION(3)

## SSH OPTIONS

CURLOPT_SSH_AUTH_TYPES

SSH authentication types. See CURLOPT_SSH_AUTH_TYPES(3)

CURLOPT_SSH_HOST_PUBLIC_KEY_MD5

MD5 of host's public key. See CURLOPT_SSH_HOST_PUBLIC_KEY_MD5(3)

CURLOPT_SSH_PUBLIC_KEYFILE

File name of public key. See CURLOPT_SSH_PUBLIC_KEYFILE(3)

CURLOPT_SSH_PRIVATE_KEYFILE

File name of private key. See CURLOPT_SSH_PRIVATE_KEYFILE(3)

CURLOPT_SSH_KNOWNHOSTS

File name with known hosts. See CURLOPT_SSH_KNOWNHOSTS(3)

CURLOPT_SSH_KEYFUNCTION

Callback for known hosts handling. See CURLOPT_SSH_KEYFUNCTION(3)

CURLOPT_SSH_KEYDATA

Custom pointer to pass to ssh key callback. See CURLOPT_SSH_KEYDATA(3)

## OTHER OPTIONS

CURLOPT_PRIVATE

Private pointer to store. See CURLOPT_PRIVATE(3)

CURLOPT_SHARE

Share object to use. See CURLOPT_SHARE(3)

CURLOPT_NEW_FILE_PERMS

Mode for creating new remote files. See CURLOPT_NEW_FILE_PERMS(3)

CURLOPT_NEW_DIRECTORY_PERMS

Mode for creating new remote directories. See CURLOPT_NEW_DIRECTORY_PERMS(3)

## TELNET OPTIONS

CURLOPT_TELNETOPTIONS

TELNET options. See CURLOPT_TELNETOPTIONS(3)

## RETURN VALUE

CURLE_OK (zero) means that the option was set properly, non-zero means an error occurred as <curl/curl.h> defines. See the libcurl-errors 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 CURLE_UNKNOWN_OPTION. If support for the option was disabled at compile-time, it will return CURLE_NOT_BUILT_IN.

## EXAMPLE

    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);
    }

## SEE ALSO

curl_easy_init, curl_easy_cleanup, curl_easy_reset, curl_easy_getinfo, curl_multi_setopt

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