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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: curl_easy_setopt
+Section: 3
+Source: libcurl
+See-also:
+  - curl_easy_cleanup (3)
+  - curl_easy_getinfo (3)
+  - curl_easy_init (3)
+  - curl_easy_option_by_id (3)
+  - curl_easy_option_by_name (3)
+  - curl_easy_option_next (3)
+  - curl_easy_reset (3)
+  - curl_multi_setopt (3)
+---
+
+# NAME
+
+curl_easy_setopt - set options for a curl easy handle
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLoption option, parameter);
+~~~
+
+# DESCRIPTION
+
+curl_easy_setopt(3) 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(3) 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(3).
+
+Strings passed to libcurl as 'char *' arguments, are copied by the library;
+the string storage associated to the pointer argument may be discarded or
+reused after curl_easy_setopt(3) 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. This function does not accept input strings longer than
+**CURL_MAX_INPUT_LENGTH** (8 MB).
+
+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(3) or
+curl_easy_duphandle(3) 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 filename 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
+
+**Deprecated option** Callback for I/O operations.
+See CURLOPT_IOCTLFUNCTION(3)
+
+## CURLOPT_IOCTLDATA
+
+**Deprecated option** 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
+
+**OBSOLETE** Callback for code base conversion.
+See CURLOPT_CONV_TO_NETWORK_FUNCTION(3)
+
+## CURLOPT_CONV_FROM_NETWORK_FUNCTION
+
+**OBSOLETE** Callback for code base conversion.
+See CURLOPT_CONV_FROM_NETWORK_FUNCTION(3)
+
+## CURLOPT_CONV_FROM_UTF8_FUNCTION
+
+**OBSOLETE** 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)
+
+## CURLOPT_SUPPRESS_CONNECT_HEADERS
+
+Suppress proxy CONNECT response headers from user callbacks. See
+CURLOPT_SUPPRESS_CONNECT_HEADERS(3)
+
+## CURLOPT_RESOLVER_START_FUNCTION
+
+Callback to be called before a new resolve request is started. See
+CURLOPT_RESOLVER_START_FUNCTION(3)
+
+## CURLOPT_RESOLVER_START_DATA
+
+Data pointer to pass to resolver start callback. See CURLOPT_RESOLVER_START_DATA(3)
+
+## CURLOPT_PREREQFUNCTION
+
+Callback to be called after a connection is established but before a request
+is made on that connection. See CURLOPT_PREREQFUNCTION(3)
+
+## CURLOPT_PREREQDATA
+
+Data pointer to pass to the CURLOPT_PREREQFUNCTION callback. See
+CURLOPT_PREREQDATA(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)
+
+## CURLOPT_KEEP_SENDING_ON_ERROR
+
+Keep sending on HTTP >= 300 errors. CURLOPT_KEEP_SENDING_ON_ERROR(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
+
+**Deprecated option** Allowed protocols. See CURLOPT_PROTOCOLS(3)
+
+## CURLOPT_PROTOCOLS_STR
+
+Allowed protocols. See CURLOPT_PROTOCOLS_STR(3)
+
+## CURLOPT_REDIR_PROTOCOLS
+
+**Deprecated option** Protocols to allow redirects to. See
+CURLOPT_REDIR_PROTOCOLS(3)
+
+## CURLOPT_REDIR_PROTOCOLS_STR
+
+Protocols to allow redirects to. See CURLOPT_REDIR_PROTOCOLS_STR(3)
+
+## CURLOPT_DEFAULT_PROTOCOL
+
+Default protocol. See CURLOPT_DEFAULT_PROTOCOL(3)
+
+## CURLOPT_PROXY
+
+Proxy to use. See CURLOPT_PROXY(3)
+
+## CURLOPT_PRE_PROXY
+
+Socks proxy to use. See CURLOPT_PRE_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_AUTH
+
+Socks5 authentication methods. See CURLOPT_SOCKS5_AUTH(3)
+
+## CURLOPT_SOCKS5_GSSAPI_SERVICE
+
+**Deprecated option** Socks5 GSSAPI service name.
+See 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_HAPROXYPROTOCOL
+
+Send an HAProxy PROXY protocol v1 header. See CURLOPT_HAPROXYPROTOCOL(3)
+
+## CURLOPT_HAPROXY_CLIENT_IP
+
+Spoof the client IP in an HAProxy PROXY protocol v1 header. See
+CURLOPT_HAPROXY_CLIENT_IP(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_DOH_URL
+
+Use this DoH server for name resolves. See CURLOPT_DOH_URL(3)
+
+## CURLOPT_BUFFERSIZE
+
+Ask for alternate buffer size. See CURLOPT_BUFFERSIZE(3)
+
+## CURLOPT_PORT
+
+Port number to connect to. See CURLOPT_PORT(3)
+
+## CURLOPT_TCP_FASTOPEN
+
+Enable 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)
+
+## CURLOPT_ABSTRACT_UNIX_SOCKET
+
+Path to an abstract Unix domain socket. See CURLOPT_ABSTRACT_UNIX_SOCKET(3)
+
+# NAMES and PASSWORDS OPTIONS (Authentication)
+
+## CURLOPT_NETRC
+
+Enable .netrc parsing. See CURLOPT_NETRC(3)
+
+## CURLOPT_NETRC_FILE
+
+.netrc filename. 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_PROXY_TLSAUTH_USERNAME
+
+Proxy TLS authentication user name. See CURLOPT_PROXY_TLSAUTH_USERNAME(3)
+
+## CURLOPT_TLSAUTH_PASSWORD
+
+TLS authentication password. See CURLOPT_TLSAUTH_PASSWORD(3)
+
+## CURLOPT_PROXY_TLSAUTH_PASSWORD
+
+Proxy TLS authentication password. See CURLOPT_PROXY_TLSAUTH_PASSWORD(3)
+
+## CURLOPT_TLSAUTH_TYPE
+
+TLS authentication methods. See CURLOPT_TLSAUTH_TYPE(3)
+
+## CURLOPT_PROXY_TLSAUTH_TYPE
+
+Proxy TLS authentication methods. See CURLOPT_PROXY_TLSAUTH_TYPE(3)
+
+## CURLOPT_PROXYAUTH
+
+HTTP proxy authentication methods. See CURLOPT_PROXYAUTH(3)
+
+## CURLOPT_SASL_AUTHZID
+
+SASL authorization identity (identity to act as). See CURLOPT_SASL_AUTHZID(3)
+
+## CURLOPT_SASL_IR
+
+Enable SASL initial response. See CURLOPT_SASL_IR(3)
+
+## CURLOPT_XOAUTH2_BEARER
+
+OAuth2 bearer token. See CURLOPT_XOAUTH2_BEARER(3)
+
+## CURLOPT_DISALLOW_USERNAME_IN_URL
+
+Do not allow username in URL. See CURLOPT_DISALLOW_USERNAME_IN_URL(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
+
+**Deprecated option** Issue an HTTP PUT request. See CURLOPT_PUT(3)
+
+## CURLOPT_POST
+
+Issue an 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
+
+**Deprecated option** 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_ALTSVC
+
+Specify the Alt-Svc: cache filename. See CURLOPT_ALTSVC(3)
+
+## CURLOPT_ALTSVC_CTRL
+
+Enable and configure Alt-Svc: treatment. See CURLOPT_ALTSVC_CTRL(3)
+
+## CURLOPT_HSTS
+
+Set HSTS cache file. See CURLOPT_HSTS(3)
+
+## CURLOPT_HSTS_CTRL
+
+Enable HSTS. See CURLOPT_HSTS_CTRL(3)
+
+## CURLOPT_HSTSREADFUNCTION
+
+Set HSTS read callback. See CURLOPT_HSTSREADFUNCTION(3)
+
+## CURLOPT_HSTSREADDATA
+
+Pass pointer to the HSTS read callback. See CURLOPT_HSTSREADDATA(3)
+
+## CURLOPT_HSTSWRITEFUNCTION
+
+Set HSTS write callback. See CURLOPT_HSTSWRITEFUNCTION(3)
+
+## CURLOPT_HSTSWRITEDATA
+
+Pass pointer to the HSTS write callback. See CURLOPT_HSTSWRITEDATA(3)
+
+## CURLOPT_HTTPGET
+
+Do an HTTP GET request. See CURLOPT_HTTPGET(3)
+
+## CURLOPT_REQUEST_TARGET
+
+Set the request target. CURLOPT_REQUEST_TARGET(3)
+
+## CURLOPT_HTTP_VERSION
+
+HTTP version to use. CURLOPT_HTTP_VERSION(3)
+
+## CURLOPT_HTTP09_ALLOWED
+
+Allow HTTP/0.9 responses. CURLOPT_HTTP09_ALLOWED(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_TRAILERFUNCTION
+
+Set callback for sending trailing headers. See
+CURLOPT_TRAILERFUNCTION(3)
+
+## CURLOPT_TRAILERDATA
+
+Custom pointer passed to the trailing headers callback. See
+CURLOPT_TRAILERDATA(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)
+
+## CURLOPT_MAIL_RCPT_ALLOWFAILS
+
+Allow RCPT TO command to fail for some recipients. See
+CURLOPT_MAIL_RCPT_ALLOWFAILS(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 EPRT. 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_SERVER_RESPONSE_TIMEOUT
+
+Timeout for server responses. See CURLOPT_SERVER_RESPONSE_TIMEOUT(3)
+
+## CURLOPT_SERVER_RESPONSE_TIMEOUT_MS
+
+Timeout for server responses. See CURLOPT_SERVER_RESPONSE_TIMEOUT_MS(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)
+
+## CURLOPT_AWS_SIGV4
+
+AWS HTTP V4 Signature. See CURLOPT_AWS_SIGV4(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_CURLU
+
+Set URL to work on with a URL handle. See CURLOPT_CURLU(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_UPLOAD_BUFFERSIZE
+
+Set upload buffer size. See CURLOPT_UPLOAD_BUFFERSIZE(3)
+
+## CURLOPT_MIMEPOST
+
+Post/send MIME data. See CURLOPT_MIMEPOST(3)
+
+## CURLOPT_MIME_OPTIONS
+
+Set MIME option flags. See CURLOPT_MIME_OPTIONS(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)
+
+## CURLOPT_TIMEVALUE_LARGE
+
+Time value for the time conditional request. See CURLOPT_TIMEVALUE_LARGE(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 reusing this. See CURLOPT_FORBID_REUSE(3)
+
+## CURLOPT_MAXAGE_CONN
+
+Limit the age (idle time) of connections for reuse. See CURLOPT_MAXAGE_CONN(3)
+
+## CURLOPT_MAXLIFETIME_CONN
+
+Limit the age (since creation) of connections for reuse. See
+CURLOPT_MAXLIFETIME_CONN(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 use. 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_DNS_SHUFFLE_ADDRESSES
+
+Shuffle addresses before use. See CURLOPT_DNS_SHUFFLE_ADDRESSES(3)
+
+## CURLOPT_ACCEPTTIMEOUT_MS
+
+Timeout for waiting for the server's connect back to be accepted. See
+CURLOPT_ACCEPTTIMEOUT_MS(3)
+
+## CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS
+
+Timeout for happy eyeballs. See CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS(3)
+
+## CURLOPT_UPKEEP_INTERVAL_MS
+
+Sets the interval at which connection upkeep are performed. See
+CURLOPT_UPKEEP_INTERVAL_MS(3)
+
+# SSL and SECURITY OPTIONS
+
+## CURLOPT_SSLCERT
+
+Client cert. See CURLOPT_SSLCERT(3)
+
+## CURLOPT_SSLCERT_BLOB
+
+Client cert memory buffer. See CURLOPT_SSLCERT_BLOB(3)
+
+## CURLOPT_PROXY_SSLCERT
+
+Proxy client cert. See CURLOPT_PROXY_SSLCERT(3)
+
+## CURLOPT_PROXY_SSLCERT_BLOB
+
+Proxy client cert memory buffer. See CURLOPT_PROXY_SSLCERT_BLOB(3)
+
+## CURLOPT_SSLCERTTYPE
+
+Client cert type. See CURLOPT_SSLCERTTYPE(3)
+
+## CURLOPT_PROXY_SSLCERTTYPE
+
+Proxy client cert type. See CURLOPT_PROXY_SSLCERTTYPE(3)
+
+## CURLOPT_SSLKEY
+
+Client key. See CURLOPT_SSLKEY(3)
+
+## CURLOPT_SSLKEY_BLOB
+
+Client key memory buffer. See CURLOPT_SSLKEY_BLOB(3)
+
+## CURLOPT_PROXY_SSLKEY
+
+Proxy client key. See CURLOPT_PROXY_SSLKEY(3)
+
+## CURLOPT_PROXY_SSLKEY_BLOB
+
+Proxy client key. See CURLOPT_PROXY_SSLKEY_BLOB(3)
+
+## CURLOPT_SSLKEYTYPE
+
+Client key type. See CURLOPT_SSLKEYTYPE(3)
+
+## CURLOPT_PROXY_SSLKEYTYPE
+
+Proxy client key type. See CURLOPT_PROXY_SSLKEYTYPE(3)
+
+## CURLOPT_KEYPASSWD
+
+Client key password. See CURLOPT_KEYPASSWD(3)
+
+## CURLOPT_PROXY_KEYPASSWD
+
+Proxy client key password. See CURLOPT_PROXY_KEYPASSWD(3)
+
+## CURLOPT_SSL_EC_CURVES
+
+Set key exchange curves. See CURLOPT_SSL_EC_CURVES(3)
+
+## CURLOPT_SSL_ENABLE_ALPN
+
+Enable use of ALPN. See CURLOPT_SSL_ENABLE_ALPN(3)
+
+## CURLOPT_SSL_ENABLE_NPN
+
+**OBSOLETE** 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_PROXY_SSLVERSION
+
+Proxy SSL version to use. See CURLOPT_PROXY_SSLVERSION(3)
+
+## CURLOPT_SSL_VERIFYHOST
+
+Verify the hostname in the SSL certificate. See CURLOPT_SSL_VERIFYHOST(3)
+
+## CURLOPT_DOH_SSL_VERIFYHOST
+
+Verify the hostname in the DoH (DNS-over-HTTPS) SSL certificate. See
+CURLOPT_DOH_SSL_VERIFYHOST(3)
+
+## CURLOPT_PROXY_SSL_VERIFYHOST
+
+Verify the hostname in the proxy SSL certificate. See
+CURLOPT_PROXY_SSL_VERIFYHOST(3)
+
+## CURLOPT_SSL_VERIFYPEER
+
+Verify the SSL certificate. See CURLOPT_SSL_VERIFYPEER(3)
+
+## CURLOPT_DOH_SSL_VERIFYPEER
+
+Verify the DoH (DNS-over-HTTPS) SSL certificate. See
+CURLOPT_DOH_SSL_VERIFYPEER(3)
+
+## CURLOPT_PROXY_SSL_VERIFYPEER
+
+Verify the proxy SSL certificate. See CURLOPT_PROXY_SSL_VERIFYPEER(3)
+
+## CURLOPT_SSL_VERIFYSTATUS
+
+Verify the SSL certificate's status. See CURLOPT_SSL_VERIFYSTATUS(3)
+
+## CURLOPT_DOH_SSL_VERIFYSTATUS
+
+Verify the DoH (DNS-over-HTTPS) SSL certificate's status. See
+CURLOPT_DOH_SSL_VERIFYSTATUS(3)
+
+## CURLOPT_CAINFO
+
+CA cert bundle. See CURLOPT_CAINFO(3)
+
+## CURLOPT_CAINFO_BLOB
+
+CA cert bundle memory buffer. See CURLOPT_CAINFO_BLOB(3)
+
+## CURLOPT_PROXY_CAINFO
+
+Proxy CA cert bundle. See CURLOPT_PROXY_CAINFO(3)
+
+## CURLOPT_PROXY_CAINFO_BLOB
+
+Proxy CA cert bundle memory buffer. See CURLOPT_PROXY_CAINFO_BLOB(3)
+
+## CURLOPT_ISSUERCERT
+
+Issuer certificate. See CURLOPT_ISSUERCERT(3)
+
+## CURLOPT_ISSUERCERT_BLOB
+
+Issuer certificate memory buffer. See CURLOPT_ISSUERCERT_BLOB(3)
+
+## CURLOPT_PROXY_ISSUERCERT
+
+Proxy issuer certificate. See CURLOPT_PROXY_ISSUERCERT(3)
+
+## CURLOPT_PROXY_ISSUERCERT_BLOB
+
+Proxy issuer certificate memory buffer. See CURLOPT_PROXY_ISSUERCERT_BLOB(3)
+
+## CURLOPT_CAPATH
+
+Path to CA cert bundle. See CURLOPT_CAPATH(3)
+
+## CURLOPT_PROXY_CAPATH
+
+Path to proxy CA cert bundle. See CURLOPT_PROXY_CAPATH(3)
+
+## CURLOPT_CRLFILE
+
+Certificate Revocation List. See CURLOPT_CRLFILE(3)
+
+## CURLOPT_PROXY_CRLFILE
+
+Proxy Certificate Revocation List. See CURLOPT_PROXY_CRLFILE(3)
+
+## CURLOPT_CA_CACHE_TIMEOUT
+
+Timeout for CA cache. See CURLOPT_CA_CACHE_TIMEOUT(3)
+
+## CURLOPT_CERTINFO
+
+Extract certificate info. See CURLOPT_CERTINFO(3)
+
+## CURLOPT_PINNEDPUBLICKEY
+
+Set pinned SSL public key . See CURLOPT_PINNEDPUBLICKEY(3)
+
+## CURLOPT_PROXY_PINNEDPUBLICKEY
+
+Set the proxy's pinned SSL public key. See
+CURLOPT_PROXY_PINNEDPUBLICKEY(3)
+
+## CURLOPT_RANDOM_FILE
+
+**OBSOLETE** Provide source for entropy random data.
+See CURLOPT_RANDOM_FILE(3)
+
+## CURLOPT_EGDSOCKET
+
+**OBSOLETE** Identify EGD socket for entropy. See CURLOPT_EGDSOCKET(3)
+
+## CURLOPT_SSL_CIPHER_LIST
+
+Ciphers to use. See CURLOPT_SSL_CIPHER_LIST(3)
+
+## CURLOPT_PROXY_SSL_CIPHER_LIST
+
+Proxy ciphers to use. See CURLOPT_PROXY_SSL_CIPHER_LIST(3)
+
+## CURLOPT_TLS13_CIPHERS
+
+TLS 1.3 cipher suites to use. See CURLOPT_TLS13_CIPHERS(3)
+
+## CURLOPT_PROXY_TLS13_CIPHERS
+
+Proxy TLS 1.3 cipher suites to use. See CURLOPT_PROXY_TLS13_CIPHERS(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_PROXY_SSL_OPTIONS
+
+Control proxy SSL behavior. See CURLOPT_PROXY_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_COMPRESSION
+
+Enable SSH compression. See CURLOPT_SSH_COMPRESSION(3)
+
+## CURLOPT_SSH_HOST_PUBLIC_KEY_MD5
+
+MD5 of host's public key. See CURLOPT_SSH_HOST_PUBLIC_KEY_MD5(3)
+
+## CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256
+
+SHA256 of host's public key. See CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256(3)
+
+## CURLOPT_SSH_PUBLIC_KEYFILE
+
+Filename of the public key. See CURLOPT_SSH_PUBLIC_KEYFILE(3)
+
+## CURLOPT_SSH_PRIVATE_KEYFILE
+
+Filename of the private key. See CURLOPT_SSH_PRIVATE_KEYFILE(3)
+
+## CURLOPT_SSH_KNOWNHOSTS
+
+Filename 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)
+
+## CURLOPT_SSH_HOSTKEYFUNCTION
+
+Callback for checking host key handling. See CURLOPT_SSH_HOSTKEYFUNCTION(3)
+
+## CURLOPT_SSH_HOSTKEYDATA
+
+Custom pointer to pass to ssh host key callback. See CURLOPT_SSH_HOSTKEYDATA(3)
+
+# WEBSOCKET
+
+## CURLOPT_WS_OPTIONS
+
+Set WebSocket options. See CURLOPT_WS_OPTIONS(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)
+
+## CURLOPT_QUICK_EXIT
+
+To be set by toplevel tools like "curl" to skip lengthy cleanups when they are
+about to call exit() anyway. See CURLOPT_QUICK_EXIT(3)
+
+# TELNET OPTIONS
+
+## CURLOPT_TELNETOPTIONS
+
+TELNET options. See CURLOPT_TELNETOPTIONS(3)
+
+# EXAMPLE
+
+~~~c
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    CURLcode res;
+    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
+    res = curl_easy_perform(curl);
+    curl_easy_cleanup(curl);
+  }
+}
+~~~
+
+# AVAILABILITY
+
+Always
+
+# 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(3) man page
+for the full list with descriptions.
+
+Strings passed on to libcurl must be shorter than 8000000 bytes, otherwise
+curl_easy_setopt(3) returns **CURLE_BAD_FUNCTION_ARGUMENT** (added in 7.65.0).
+
+**CURLE_BAD_FUNCTION_ARGUMENT** is returned when the argument to an option is
+invalid, like perhaps out of range.
+
+If you try to set an option that libcurl does not know about, perhaps because
+the library is too old to support it or the option was removed in a recent
+version, this function returns *CURLE_UNKNOWN_OPTION*. If support for the
+option was disabled at compile-time, it returns *CURLE_NOT_BUILT_IN*.