Hu Chunming / village_ascend_arm

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  .TH curl_easy_setopt 3 "April 24, 2021" "libcurl 7.77.0" "libcurl Manual"
  
  .SH NAME
  curl_easy_setopt \- set options for a curl easy handle
  .SH SYNOPSIS
  #include <curl/curl.h>
  
  CURLcode curl_easy_setopt(CURL *handle, CURLoption option, parameter);
  .SH DESCRIPTION
  \fIcurl_easy_setopt(3)\fP is used to tell libcurl how to behave. By setting
  the appropriate options, the application can change libcurl's behavior.  All
  options are set with an \fIoption\fP followed by a \fIparameter\fP. That
  parameter can be a \fBlong\fP, a \fBfunction pointer\fP, an \fBobject
  pointer\fP or a \fBcurl_off_t\fP, depending on what the specific option
  expects. Read this manual carefully as bad input values may cause libcurl to
  behave badly!  You can only set one option in each function call. A typical
  application uses many \fIcurl_easy_setopt(3)\fP calls in the setup phase.
  
  Options set with this function call are valid for all forthcoming transfers
  performed using this \fIhandle\fP.  The options are not in any way reset
  between transfers, so if you want subsequent transfers with different options,
  you must change them between the transfers. You can optionally reset all
  options back to internal default with \fIcurl_easy_reset(3)\fP.
  
  Strings passed to libcurl as 'char *' arguments, are copied by the library;
  thus the string storage associated to the pointer argument may be overwritten
  after \fIcurl_easy_setopt(3)\fP returns. The only exception to this rule is
  really \fICURLOPT_POSTFIELDS(3)\fP, but the alternative that copies the string
  \fICURLOPT_COPYPOSTFIELDS(3)\fP has some usage characteristics you need to
  read up on. This function does not accept input strings longer than
  \fBCURL_MAX_INPUT_LENGTH\fP (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 \fIhandle\fP is the return code from a \fIcurl_easy_init(3)\fP or
  \fIcurl_easy_duphandle(3)\fP call.
  .SH BEHAVIOR OPTIONS
  .IP CURLOPT_VERBOSE
  Display verbose information. See \fICURLOPT_VERBOSE(3)\fP
  .IP CURLOPT_HEADER
  Include the header in the body output. See \fICURLOPT_HEADER(3)\fP
  .IP CURLOPT_NOPROGRESS
  Shut off the progress meter. See \fICURLOPT_NOPROGRESS(3)\fP
  .IP CURLOPT_NOSIGNAL
  Do not install signal handlers. See \fICURLOPT_NOSIGNAL(3)\fP
  .IP CURLOPT_WILDCARDMATCH
  Transfer multiple files according to a file name pattern. See \fICURLOPT_WILDCARDMATCH(3)\fP
  .SH CALLBACK OPTIONS
  .IP CURLOPT_WRITEFUNCTION
  Callback for writing data. See \fICURLOPT_WRITEFUNCTION(3)\fP
  .IP CURLOPT_WRITEDATA
  Data pointer to pass to the write callback. See \fICURLOPT_WRITEDATA(3)\fP
  .IP CURLOPT_READFUNCTION
  Callback for reading data. See \fICURLOPT_READFUNCTION(3)\fP
  .IP CURLOPT_READDATA
  Data pointer to pass to the read callback. See \fICURLOPT_READDATA(3)\fP
  .IP CURLOPT_IOCTLFUNCTION
  Callback for I/O operations. See \fICURLOPT_IOCTLFUNCTION(3)\fP
  .IP CURLOPT_IOCTLDATA
  Data pointer to pass to the I/O callback. See \fICURLOPT_IOCTLDATA(3)\fP
  .IP CURLOPT_SEEKFUNCTION
  Callback for seek operations. See \fICURLOPT_SEEKFUNCTION(3)\fP
  .IP CURLOPT_SEEKDATA
  Data pointer to pass to the seek callback. See \fICURLOPT_SEEKDATA(3)\fP
  .IP CURLOPT_SOCKOPTFUNCTION
  Callback for sockopt operations. See \fICURLOPT_SOCKOPTFUNCTION(3)\fP
  .IP CURLOPT_SOCKOPTDATA
  Data pointer to pass to the sockopt callback. See \fICURLOPT_SOCKOPTDATA(3)\fP
  .IP CURLOPT_OPENSOCKETFUNCTION
  Callback for socket creation. See \fICURLOPT_OPENSOCKETFUNCTION(3)\fP
  .IP CURLOPT_OPENSOCKETDATA
  Data pointer to pass to the open socket callback. See \fICURLOPT_OPENSOCKETDATA(3)\fP
  .IP CURLOPT_CLOSESOCKETFUNCTION
  Callback for closing socket. See \fICURLOPT_CLOSESOCKETFUNCTION(3)\fP
  .IP CURLOPT_CLOSESOCKETDATA
  Data pointer to pass to the close socket callback. See \fICURLOPT_CLOSESOCKETDATA(3)\fP
  .IP CURLOPT_PROGRESSFUNCTION
  OBSOLETE callback for progress meter. See \fICURLOPT_PROGRESSFUNCTION(3)\fP
  .IP CURLOPT_PROGRESSDATA
  Data pointer to pass to the progress meter callback. See \fICURLOPT_PROGRESSDATA(3)\fP
  .IP CURLOPT_XFERINFOFUNCTION
  Callback for progress meter. See \fICURLOPT_XFERINFOFUNCTION(3)\fP
  .IP CURLOPT_XFERINFODATA
  Data pointer to pass to the progress meter callback. See \fICURLOPT_XFERINFODATA(3)\fP
  .IP CURLOPT_HEADERFUNCTION
  Callback for writing received headers. See \fICURLOPT_HEADERFUNCTION(3)\fP
  .IP CURLOPT_HEADERDATA
  Data pointer to pass to the header callback. See \fICURLOPT_HEADERDATA(3)\fP
  .IP CURLOPT_DEBUGFUNCTION
  Callback for debug information. See \fICURLOPT_DEBUGFUNCTION(3)\fP
  .IP CURLOPT_DEBUGDATA
  Data pointer to pass to the debug callback. See \fICURLOPT_DEBUGDATA(3)\fP
  .IP CURLOPT_SSL_CTX_FUNCTION
  Callback for SSL context logic. See \fICURLOPT_SSL_CTX_FUNCTION(3)\fP
  .IP CURLOPT_SSL_CTX_DATA
  Data pointer to pass to the SSL context callback. See \fICURLOPT_SSL_CTX_DATA(3)\fP
  .IP CURLOPT_CONV_TO_NETWORK_FUNCTION
  Callback for code base conversion. See \fICURLOPT_CONV_TO_NETWORK_FUNCTION(3)\fP
  .IP CURLOPT_CONV_FROM_NETWORK_FUNCTION
  Callback for code base conversion. See \fICURLOPT_CONV_FROM_NETWORK_FUNCTION(3)\fP
  .IP CURLOPT_CONV_FROM_UTF8_FUNCTION
  Callback for code base conversion. See \fICURLOPT_CONV_FROM_UTF8_FUNCTION(3)\fP
  .IP CURLOPT_INTERLEAVEFUNCTION
  Callback for RTSP interleaved data. See \fICURLOPT_INTERLEAVEFUNCTION(3)\fP
  .IP CURLOPT_INTERLEAVEDATA
  Data pointer to pass to the RTSP interleave callback. See \fICURLOPT_INTERLEAVEDATA(3)\fP
  .IP CURLOPT_CHUNK_BGN_FUNCTION
  Callback for wildcard download start of chunk. See \fICURLOPT_CHUNK_BGN_FUNCTION(3)\fP
  .IP CURLOPT_CHUNK_END_FUNCTION
  Callback for wildcard download end of chunk. See \fICURLOPT_CHUNK_END_FUNCTION(3)\fP
  .IP CURLOPT_CHUNK_DATA
  Data pointer to pass to the chunk callbacks. See \fICURLOPT_CHUNK_DATA(3)\fP
  .IP CURLOPT_FNMATCH_FUNCTION
  Callback for wildcard matching. See \fICURLOPT_FNMATCH_FUNCTION(3)\fP
  .IP CURLOPT_FNMATCH_DATA
  Data pointer to pass to the wildcard matching callback. See \fICURLOPT_FNMATCH_DATA(3)\fP
  .IP CURLOPT_SUPPRESS_CONNECT_HEADERS
  Suppress proxy CONNECT response headers from user callbacks. See \fICURLOPT_SUPPRESS_CONNECT_HEADERS(3)\fP
  .IP CURLOPT_RESOLVER_START_FUNCTION
  Callback to be called before a new resolve request is started. See \fICURLOPT_RESOLVER_START_FUNCTION(3)\fP
  .IP CURLOPT_RESOLVER_START_DATA
  Data pointer to pass to resolver start callback. See \fICURLOPT_RESOLVER_START_DATA(3)\fP
  .SH ERROR OPTIONS
  .IP CURLOPT_ERRORBUFFER
  Error message buffer. See \fICURLOPT_ERRORBUFFER(3)\fP
  .IP CURLOPT_STDERR
  stderr replacement stream. See \fICURLOPT_STDERR(3)\fP
  .IP CURLOPT_FAILONERROR
  Fail on HTTP 4xx errors. \fICURLOPT_FAILONERROR(3)\fP
  .IP CURLOPT_KEEP_SENDING_ON_ERROR
  Keep sending on HTTP >= 300 errors. \fICURLOPT_KEEP_SENDING_ON_ERROR(3)\fP
  .SH NETWORK OPTIONS
  .IP CURLOPT_URL
  URL to work on. See \fICURLOPT_URL(3)\fP
  .IP CURLOPT_PATH_AS_IS
  Disable squashing /../ and /./ sequences in the path. See \fICURLOPT_PATH_AS_IS(3)\fP
  .IP CURLOPT_PROTOCOLS
  Allowed protocols. See \fICURLOPT_PROTOCOLS(3)\fP
  .IP CURLOPT_REDIR_PROTOCOLS
  Protocols to allow redirects to. See \fICURLOPT_REDIR_PROTOCOLS(3)\fP
  .IP CURLOPT_DEFAULT_PROTOCOL
  Default protocol. See \fICURLOPT_DEFAULT_PROTOCOL(3)\fP
  .IP CURLOPT_PROXY
  Proxy to use. See \fICURLOPT_PROXY(3)\fP
  .IP CURLOPT_PRE_PROXY
  Socks proxy to use. See \fICURLOPT_PRE_PROXY(3)\fP
  .IP CURLOPT_PROXYPORT
  Proxy port to use. See \fICURLOPT_PROXYPORT(3)\fP
  .IP CURLOPT_PROXYTYPE
  Proxy type. See \fICURLOPT_PROXYTYPE(3)\fP
  .IP CURLOPT_NOPROXY
  Filter out hosts from proxy use. \fICURLOPT_NOPROXY(3)\fP
  .IP CURLOPT_HTTPPROXYTUNNEL
  Tunnel through the HTTP proxy. \fICURLOPT_HTTPPROXYTUNNEL(3)\fP
  .IP CURLOPT_CONNECT_TO
  Connect to a specific host and port. See \fICURLOPT_CONNECT_TO(3)\fP
  .IP CURLOPT_SOCKS5_AUTH
  Socks5 authentication methods. See \fICURLOPT_SOCKS5_AUTH(3)\fP
  .IP CURLOPT_SOCKS5_GSSAPI_SERVICE
  Socks5 GSSAPI service name. \fICURLOPT_SOCKS5_GSSAPI_SERVICE(3)\fP
  .IP CURLOPT_SOCKS5_GSSAPI_NEC
  Socks5 GSSAPI NEC mode. See \fICURLOPT_SOCKS5_GSSAPI_NEC(3)\fP
  .IP CURLOPT_PROXY_SERVICE_NAME
  Proxy authentication service name. \fICURLOPT_PROXY_SERVICE_NAME(3)\fP
  .IP CURLOPT_HAPROXYPROTOCOL
  Send an HAProxy PROXY protocol v1 header. See \fICURLOPT_HAPROXYPROTOCOL(3)\fP
  .IP CURLOPT_SERVICE_NAME
  Authentication service name. \fICURLOPT_SERVICE_NAME(3)\fP
  .IP CURLOPT_INTERFACE
  Bind connection locally to this. See \fICURLOPT_INTERFACE(3)\fP
  .IP CURLOPT_LOCALPORT
  Bind connection locally to this port. See \fICURLOPT_LOCALPORT(3)\fP
  .IP CURLOPT_LOCALPORTRANGE
  Bind connection locally to port range. See \fICURLOPT_LOCALPORTRANGE(3)\fP
  .IP CURLOPT_DNS_CACHE_TIMEOUT
  Timeout for DNS cache. See \fICURLOPT_DNS_CACHE_TIMEOUT(3)\fP
  .IP CURLOPT_DNS_USE_GLOBAL_CACHE
  OBSOLETE Enable global DNS cache. See \fICURLOPT_DNS_USE_GLOBAL_CACHE(3)\fP
  .IP CURLOPT_DOH_URL
  Use this DOH server for name resolves. See \fICURLOPT_DOH_URL(3)\fP
  .IP CURLOPT_BUFFERSIZE
  Ask for alternate buffer size. See \fICURLOPT_BUFFERSIZE(3)\fP
  .IP CURLOPT_PORT
  Port number to connect to. See \fICURLOPT_PORT(3)\fP
  .IP CURLOPT_TCP_FASTOPEN
  Enable TFO, TCP Fast Open. See \fICURLOPT_TCP_FASTOPEN(3)\fP
  .IP CURLOPT_TCP_NODELAY
  Disable the Nagle algorithm. See \fICURLOPT_TCP_NODELAY(3)\fP
  .IP CURLOPT_ADDRESS_SCOPE
  IPv6 scope for local addresses. See \fICURLOPT_ADDRESS_SCOPE(3)\fP
  .IP CURLOPT_TCP_KEEPALIVE
  Enable TCP keep-alive. See \fICURLOPT_TCP_KEEPALIVE(3)\fP
  .IP CURLOPT_TCP_KEEPIDLE
  Idle time before sending keep-alive. See \fICURLOPT_TCP_KEEPIDLE(3)\fP
  .IP CURLOPT_TCP_KEEPINTVL
  Interval between keep-alive probes. See \fICURLOPT_TCP_KEEPINTVL(3)\fP
  .IP CURLOPT_UNIX_SOCKET_PATH
  Path to a Unix domain socket. See \fICURLOPT_UNIX_SOCKET_PATH(3)\fP
  .IP CURLOPT_ABSTRACT_UNIX_SOCKET
  Path to an abstract Unix domain socket. See \fICURLOPT_ABSTRACT_UNIX_SOCKET(3)\fP
  .SH NAMES and PASSWORDS OPTIONS (Authentication)
  .IP CURLOPT_NETRC
  Enable .netrc parsing. See \fICURLOPT_NETRC(3)\fP
  .IP CURLOPT_NETRC_FILE
  \&.netrc file name. See \fICURLOPT_NETRC_FILE(3)\fP
  .IP CURLOPT_USERPWD
  User name and password. See \fICURLOPT_USERPWD(3)\fP
  .IP CURLOPT_PROXYUSERPWD
  Proxy user name and password. See \fICURLOPT_PROXYUSERPWD(3)\fP
  .IP CURLOPT_USERNAME
  User name. See \fICURLOPT_USERNAME(3)\fP
  .IP CURLOPT_PASSWORD
  Password. See \fICURLOPT_PASSWORD(3)\fP
  .IP CURLOPT_LOGIN_OPTIONS
  Login options. See \fICURLOPT_LOGIN_OPTIONS(3)\fP
  .IP CURLOPT_PROXYUSERNAME
  Proxy user name. See \fICURLOPT_PROXYUSERNAME(3)\fP
  .IP CURLOPT_PROXYPASSWORD
  Proxy password. See \fICURLOPT_PROXYPASSWORD(3)\fP
  .IP CURLOPT_HTTPAUTH
  HTTP server authentication methods. See \fICURLOPT_HTTPAUTH(3)\fP
  .IP CURLOPT_TLSAUTH_USERNAME
  TLS authentication user name. See \fICURLOPT_TLSAUTH_USERNAME(3)\fP
  .IP CURLOPT_PROXY_TLSAUTH_USERNAME
  Proxy TLS authentication user name. See \fICURLOPT_PROXY_TLSAUTH_USERNAME(3)\fP
  .IP CURLOPT_TLSAUTH_PASSWORD
  TLS authentication password. See \fICURLOPT_TLSAUTH_PASSWORD(3)\fP
  .IP CURLOPT_PROXY_TLSAUTH_PASSWORD
  Proxy TLS authentication password. See \fICURLOPT_PROXY_TLSAUTH_PASSWORD(3)\fP
  .IP CURLOPT_TLSAUTH_TYPE
  TLS authentication methods. See \fICURLOPT_TLSAUTH_TYPE(3)\fP
  .IP CURLOPT_PROXY_TLSAUTH_TYPE
  Proxy TLS authentication methods. See \fICURLOPT_PROXY_TLSAUTH_TYPE(3)\fP
  .IP CURLOPT_PROXYAUTH
  HTTP proxy authentication methods. See \fICURLOPT_PROXYAUTH(3)\fP
  .IP CURLOPT_SASL_AUTHZID
  SASL authorisation identity (identity to act as). See \fICURLOPT_SASL_AUTHZID(3)\fP
  .IP CURLOPT_SASL_IR
  Enable SASL initial response. See \fICURLOPT_SASL_IR(3)\fP
  .IP CURLOPT_XOAUTH2_BEARER
  OAuth2 bearer token. See \fICURLOPT_XOAUTH2_BEARER(3)\fP
  .IP CURLOPT_DISALLOW_USERNAME_IN_URL
  Don't allow username in URL. See \fICURLOPT_DISALLOW_USERNAME_IN_URL(3)\fP
  .SH HTTP OPTIONS
  .IP CURLOPT_AUTOREFERER
  Automatically set Referer: header. See \fICURLOPT_AUTOREFERER(3)\fP
  .IP CURLOPT_ACCEPT_ENCODING
  Accept-Encoding and automatic decompressing data. See \fICURLOPT_ACCEPT_ENCODING(3)\fP
  .IP CURLOPT_TRANSFER_ENCODING
  Request Transfer-Encoding. See \fICURLOPT_TRANSFER_ENCODING(3)\fP
  .IP CURLOPT_FOLLOWLOCATION
  Follow HTTP redirects. See \fICURLOPT_FOLLOWLOCATION(3)\fP
  .IP CURLOPT_UNRESTRICTED_AUTH
  Do not restrict authentication to original host. \fICURLOPT_UNRESTRICTED_AUTH(3)\fP
  .IP CURLOPT_MAXREDIRS
  Maximum number of redirects to follow. See \fICURLOPT_MAXREDIRS(3)\fP
  .IP CURLOPT_POSTREDIR
  How to act on redirects after POST. See \fICURLOPT_POSTREDIR(3)\fP
  .IP CURLOPT_PUT
  Issue an HTTP PUT request. See \fICURLOPT_PUT(3)\fP
  .IP CURLOPT_POST
  Issue an HTTP POST request. See \fICURLOPT_POST(3)\fP
  .IP CURLOPT_POSTFIELDS
  Send a POST with this data. See \fICURLOPT_POSTFIELDS(3)\fP
  .IP CURLOPT_POSTFIELDSIZE
  The POST data is this big. See \fICURLOPT_POSTFIELDSIZE(3)\fP
  .IP CURLOPT_POSTFIELDSIZE_LARGE
  The POST data is this big. See \fICURLOPT_POSTFIELDSIZE_LARGE(3)\fP
  .IP CURLOPT_COPYPOSTFIELDS
  Send a POST with this data - and copy it. See \fICURLOPT_COPYPOSTFIELDS(3)\fP
  .IP CURLOPT_HTTPPOST
  Multipart formpost HTTP POST. See \fICURLOPT_HTTPPOST(3)\fP
  .IP CURLOPT_REFERER
  Referer: header. See \fICURLOPT_REFERER(3)\fP
  .IP CURLOPT_USERAGENT
  User-Agent: header. See \fICURLOPT_USERAGENT(3)\fP
  .IP CURLOPT_HTTPHEADER
  Custom HTTP headers. See \fICURLOPT_HTTPHEADER(3)\fP
  .IP CURLOPT_HEADEROPT
  Control custom headers. See \fICURLOPT_HEADEROPT(3)\fP
  .IP CURLOPT_PROXYHEADER
  Custom HTTP headers sent to proxy. See \fICURLOPT_PROXYHEADER(3)\fP
  .IP CURLOPT_HTTP200ALIASES
  Alternative versions of 200 OK. See \fICURLOPT_HTTP200ALIASES(3)\fP
  .IP CURLOPT_COOKIE
  Cookie(s) to send. See \fICURLOPT_COOKIE(3)\fP
  .IP CURLOPT_COOKIEFILE
  File to read cookies from. See \fICURLOPT_COOKIEFILE(3)\fP
  .IP CURLOPT_COOKIEJAR
  File to write cookies to. See \fICURLOPT_COOKIEJAR(3)\fP
  .IP CURLOPT_COOKIESESSION
  Start a new cookie session. See \fICURLOPT_COOKIESESSION(3)\fP
  .IP CURLOPT_COOKIELIST
  Add or control cookies. See \fICURLOPT_COOKIELIST(3)\fP
  .IP CURLOPT_ALTSVC
  Specify the Alt-Svc: cache file name. See \fICURLOPT_ALTSVC(3)\fP
  .IP CURLOPT_ALTSVC_CTRL
  Enable and configure Alt-Svc: treatment. See \fICURLOPT_ALTSVC_CTRL(3)\fP
  .IP CURLOPT_HSTS
  Set HSTS cache file. See \fICURLOPT_HSTS(3)\fP
  .IP CURLOPT_HSTS_CTRL
  Enable HSTS. See \fICURLOPT_HSTS_CTRL(3)\fP
  .IP CURLOPT_HSTSREADFUNCTION
  Set HSTS read callback. See \fICURLOPT_HSTSREADFUNCTION(3)\fP
  .IP CURLOPT_HSTSREADDATA
  Pass pointer to the HSTS read callback. See \fICURLOPT_HSTSREADDATA(3)\fP
  .IP CURLOPT_HSTSWRITEFUNCTION
  Set HSTS write callback. See \fICURLOPT_HSTSWRITEFUNCTION(3)\fP
  .IP CURLOPT_HSTSWRITEDATA
  Pass pointer to the HSTS write callback. See \fICURLOPT_HSTSWRITEDATA(3)\fP
  .IP CURLOPT_HTTPGET
  Do an HTTP GET request. See \fICURLOPT_HTTPGET(3)\fP
  .IP CURLOPT_REQUEST_TARGET
  Set the request target. \fICURLOPT_REQUEST_TARGET(3)\fP
  .IP CURLOPT_HTTP_VERSION
  HTTP version to use. \fICURLOPT_HTTP_VERSION(3)\fP
  .IP CURLOPT_HTTP09_ALLOWED
  Allow HTTP/0.9 responses. \fICURLOPT_HTTP09_ALLOWED(3)\fP
  .IP CURLOPT_IGNORE_CONTENT_LENGTH
  Ignore Content-Length. See \fICURLOPT_IGNORE_CONTENT_LENGTH(3)\fP
  .IP CURLOPT_HTTP_CONTENT_DECODING
  Disable Content decoding. See \fICURLOPT_HTTP_CONTENT_DECODING(3)\fP
  .IP CURLOPT_HTTP_TRANSFER_DECODING
  Disable Transfer decoding. See \fICURLOPT_HTTP_TRANSFER_DECODING(3)\fP
  .IP CURLOPT_EXPECT_100_TIMEOUT_MS
  100-continue timeout. See \fICURLOPT_EXPECT_100_TIMEOUT_MS(3)\fP
  .IP CURLOPT_TRAILERFUNCTION
  Set callback for sending trailing headers. See
  \fICURLOPT_TRAILERFUNCTION(3)\fP
  .IP CURLOPT_TRAILERDATA
  Custom pointer passed to the trailing headers callback. See
  \fICURLOPT_TRAILERDATA(3)\fP
  .IP CURLOPT_PIPEWAIT
  Wait on connection to pipeline on it. See \fICURLOPT_PIPEWAIT(3)\fP
  .IP CURLOPT_STREAM_DEPENDS
  This HTTP/2 stream depends on another. See \fICURLOPT_STREAM_DEPENDS(3)\fP
  .IP CURLOPT_STREAM_DEPENDS_E
  This HTTP/2 stream depends on another exclusively. See
  \fICURLOPT_STREAM_DEPENDS_E(3)\fP
  .IP CURLOPT_STREAM_WEIGHT
  Set this HTTP/2 stream's weight. See \fICURLOPT_STREAM_WEIGHT(3)\fP
  .SH SMTP OPTIONS
  .IP CURLOPT_MAIL_FROM
  Address of the sender. See \fICURLOPT_MAIL_FROM(3)\fP
  .IP CURLOPT_MAIL_RCPT
  Address of the recipients. See \fICURLOPT_MAIL_RCPT(3)\fP
  .IP CURLOPT_MAIL_AUTH
  Authentication address. See \fICURLOPT_MAIL_AUTH(3)\fP
  .IP CURLOPT_MAIL_RCPT_ALLLOWFAILS
  Allow RCPT TO command to fail for some recipients. See \fICURLOPT_MAIL_RCPT_ALLLOWFAILS(3)\fP
  .SH TFTP OPTIONS
  .IP CURLOPT_TFTP_BLKSIZE
  TFTP block size. See \fICURLOPT_TFTP_BLKSIZE(3)\fP
  .IP CURLOPT_TFTP_NO_OPTIONS
  Do not send TFTP options requests. See \fICURLOPT_TFTP_NO_OPTIONS(3)\fP
  .SH FTP OPTIONS
  .IP CURLOPT_FTPPORT
  Use active FTP. See \fICURLOPT_FTPPORT(3)\fP
  .IP CURLOPT_QUOTE
  Commands to run before transfer. See \fICURLOPT_QUOTE(3)\fP
  .IP CURLOPT_POSTQUOTE
  Commands to run after transfer. See \fICURLOPT_POSTQUOTE(3)\fP
  .IP CURLOPT_PREQUOTE
  Commands to run just before transfer. See \fICURLOPT_PREQUOTE(3)\fP
  .IP CURLOPT_APPEND
  Append to remote file. See \fICURLOPT_APPEND(3)\fP
  .IP CURLOPT_FTP_USE_EPRT
  Use EPTR. See \fICURLOPT_FTP_USE_EPRT(3)\fP
  .IP CURLOPT_FTP_USE_EPSV
  Use EPSV. See \fICURLOPT_FTP_USE_EPSV(3)\fP
  .IP CURLOPT_FTP_USE_PRET
  Use PRET. See \fICURLOPT_FTP_USE_PRET(3)\fP
  .IP CURLOPT_FTP_CREATE_MISSING_DIRS
  Create missing directories on the remote server. See \fICURLOPT_FTP_CREATE_MISSING_DIRS(3)\fP
  .IP CURLOPT_FTP_RESPONSE_TIMEOUT
  Timeout for FTP responses. See \fICURLOPT_FTP_RESPONSE_TIMEOUT(3)\fP
  .IP CURLOPT_FTP_ALTERNATIVE_TO_USER
  Alternative to USER. See \fICURLOPT_FTP_ALTERNATIVE_TO_USER(3)\fP
  .IP CURLOPT_FTP_SKIP_PASV_IP
  Ignore the IP address in the PASV response. See \fICURLOPT_FTP_SKIP_PASV_IP(3)\fP
  .IP CURLOPT_FTPSSLAUTH
  Control how to do TLS. See \fICURLOPT_FTPSSLAUTH(3)\fP
  .IP CURLOPT_FTP_SSL_CCC
  Back to non-TLS again after authentication. See \fICURLOPT_FTP_SSL_CCC(3)\fP
  .IP CURLOPT_FTP_ACCOUNT
  Send ACCT command. See \fICURLOPT_FTP_ACCOUNT(3)\fP
  .IP CURLOPT_FTP_FILEMETHOD
  Specify how to reach files. See \fICURLOPT_FTP_FILEMETHOD(3)\fP
  .SH RTSP OPTIONS
  .IP CURLOPT_RTSP_REQUEST
  RTSP request. See \fICURLOPT_RTSP_REQUEST(3)\fP
  .IP CURLOPT_RTSP_SESSION_ID
  RTSP session-id. See \fICURLOPT_RTSP_SESSION_ID(3)\fP
  .IP CURLOPT_RTSP_STREAM_URI
  RTSP stream URI. See \fICURLOPT_RTSP_STREAM_URI(3)\fP
  .IP CURLOPT_RTSP_TRANSPORT
  RTSP Transport: header. See \fICURLOPT_RTSP_TRANSPORT(3)\fP
  .IP CURLOPT_RTSP_CLIENT_CSEQ
  Client CSEQ number. See \fICURLOPT_RTSP_CLIENT_CSEQ(3)\fP
  .IP CURLOPT_RTSP_SERVER_CSEQ
  CSEQ number for RTSP Server->Client request. See \fICURLOPT_RTSP_SERVER_CSEQ(3)\fP
  .IP CURLOPT_AWS_SIGV4
  AWS HTTP V4 Signature. See \fICURLOPT_AWS_SIGV4(3)\fP
  .SH PROTOCOL OPTIONS
  .IP CURLOPT_TRANSFERTEXT
  Use text transfer. See \fICURLOPT_TRANSFERTEXT(3)\fP
  .IP CURLOPT_PROXY_TRANSFER_MODE
  Add transfer mode to URL over proxy. See \fICURLOPT_PROXY_TRANSFER_MODE(3)\fP
  .IP CURLOPT_CRLF
  Convert newlines. See \fICURLOPT_CRLF(3)\fP
  .IP CURLOPT_RANGE
  Range requests. See \fICURLOPT_RANGE(3)\fP
  .IP CURLOPT_RESUME_FROM
  Resume a transfer. See \fICURLOPT_RESUME_FROM(3)\fP
  .IP CURLOPT_RESUME_FROM_LARGE
  Resume a transfer. See \fICURLOPT_RESUME_FROM_LARGE(3)\fP
  .IP CURLOPT_CURLU
  Set URL to work on with CURLU *. See \fICURLOPT_CURLU(3)\fP
  .IP CURLOPT_CUSTOMREQUEST
  Custom request/method. See \fICURLOPT_CUSTOMREQUEST(3)\fP
  .IP CURLOPT_FILETIME
  Request file modification date and time. See \fICURLOPT_FILETIME(3)\fP
  .IP CURLOPT_DIRLISTONLY
  List only. See \fICURLOPT_DIRLISTONLY(3)\fP
  .IP CURLOPT_NOBODY
  Do not get the body contents. See \fICURLOPT_NOBODY(3)\fP
  .IP CURLOPT_INFILESIZE
  Size of file to send. \fICURLOPT_INFILESIZE(3)\fP
  .IP CURLOPT_INFILESIZE_LARGE
  Size of file to send. \fICURLOPT_INFILESIZE_LARGE(3)\fP
  .IP CURLOPT_UPLOAD
  Upload data. See \fICURLOPT_UPLOAD(3)\fP
  .IP CURLOPT_UPLOAD_BUFFERSIZE
  Set upload buffer size. See \fICURLOPT_UPLOAD_BUFFERSIZE(3)\fP
  .IP CURLOPT_MIMEPOST
  Post/send MIME data. See \fICURLOPT_MIMEPOST(3)\fP
  .IP CURLOPT_MAXFILESIZE
  Maximum file size to get. See \fICURLOPT_MAXFILESIZE(3)\fP
  .IP CURLOPT_MAXFILESIZE_LARGE
  Maximum file size to get. See \fICURLOPT_MAXFILESIZE_LARGE(3)\fP
  .IP CURLOPT_TIMECONDITION
  Make a time conditional request. See \fICURLOPT_TIMECONDITION(3)\fP
  .IP CURLOPT_TIMEVALUE
  Time value for the time conditional request. See \fICURLOPT_TIMEVALUE(3)\fP
  .IP CURLOPT_TIMEVALUE_LARGE
  Time value for the time conditional request. See \fICURLOPT_TIMEVALUE_LARGE(3)\fP
  .SH CONNECTION OPTIONS
  .IP CURLOPT_TIMEOUT
  Timeout for the entire request. See \fICURLOPT_TIMEOUT(3)\fP
  .IP CURLOPT_TIMEOUT_MS
  Millisecond timeout for the entire request. See \fICURLOPT_TIMEOUT_MS(3)\fP
  .IP CURLOPT_LOW_SPEED_LIMIT
  Low speed limit to abort transfer. See \fICURLOPT_LOW_SPEED_LIMIT(3)\fP
  .IP CURLOPT_LOW_SPEED_TIME
  Time to be below the speed to trigger low speed abort. See \fICURLOPT_LOW_SPEED_TIME(3)\fP
  .IP CURLOPT_MAX_SEND_SPEED_LARGE
  Cap the upload speed to this. See \fICURLOPT_MAX_SEND_SPEED_LARGE(3)\fP
  .IP CURLOPT_MAX_RECV_SPEED_LARGE
  Cap the download speed to this. See \fICURLOPT_MAX_RECV_SPEED_LARGE(3)\fP
  .IP CURLOPT_MAXCONNECTS
  Maximum number of connections in the connection pool. See \fICURLOPT_MAXCONNECTS(3)\fP
  .IP CURLOPT_FRESH_CONNECT
  Use a new connection. \fICURLOPT_FRESH_CONNECT(3)\fP
  .IP CURLOPT_FORBID_REUSE
  Prevent subsequent connections from re-using this. See \fICURLOPT_FORBID_REUSE(3)\fP
  .IP CURLOPT_MAXAGE_CONN
  Limit the age of connections for reuse. See \fICURLOPT_MAXAGE_CONN(3)\fP
  .IP CURLOPT_CONNECTTIMEOUT
  Timeout for the connection phase. See \fICURLOPT_CONNECTTIMEOUT(3)\fP
  .IP CURLOPT_CONNECTTIMEOUT_MS
  Millisecond timeout for the connection phase. See \fICURLOPT_CONNECTTIMEOUT_MS(3)\fP
  .IP CURLOPT_IPRESOLVE
  IP version to use. See \fICURLOPT_IPRESOLVE(3)\fP
  .IP CURLOPT_CONNECT_ONLY
  Only connect, nothing else. See \fICURLOPT_CONNECT_ONLY(3)\fP
  .IP CURLOPT_USE_SSL
  Use TLS/SSL. See \fICURLOPT_USE_SSL(3)\fP
  .IP CURLOPT_RESOLVE
  Provide fixed/fake name resolves. See \fICURLOPT_RESOLVE(3)\fP
  .IP CURLOPT_DNS_INTERFACE
  Bind name resolves to this interface. See \fICURLOPT_DNS_INTERFACE(3)\fP
  .IP CURLOPT_DNS_LOCAL_IP4
  Bind name resolves to this IP4 address. See \fICURLOPT_DNS_LOCAL_IP4(3)\fP
  .IP CURLOPT_DNS_LOCAL_IP6
  Bind name resolves to this IP6 address. See \fICURLOPT_DNS_LOCAL_IP6(3)\fP
  .IP CURLOPT_DNS_SERVERS
  Preferred DNS servers. See \fICURLOPT_DNS_SERVERS(3)\fP
  .IP CURLOPT_DNS_SHUFFLE_ADDRESSES
  Shuffle addresses before use. See \fICURLOPT_DNS_SHUFFLE_ADDRESSES(3)\fP
  .IP CURLOPT_ACCEPTTIMEOUT_MS
  Timeout for waiting for the server's connect back to be accepted. See \fICURLOPT_ACCEPTTIMEOUT_MS(3)\fP
  .IP CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS
  Timeout for happy eyeballs. See \fICURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS(3)\fP
  .IP CURLOPT_UPKEEP_INTERVAL_MS
  Sets the interval at which connection upkeep are performed. See
  \fICURLOPT_UPKEEP_INTERVAL_MS(3)\fP
  .SH SSL and SECURITY OPTIONS
  .IP CURLOPT_SSLCERT
  Client cert. See \fICURLOPT_SSLCERT(3)\fP
  .IP CURLOPT_SSLCERT_BLOB
  Client cert memory buffer. See \fICURLOPT_SSLCERT_BLOB(3)\fP
  .IP CURLOPT_PROXY_SSLCERT
  Proxy client cert. See \fICURLOPT_PROXY_SSLCERT(3)\fP
  .IP CURLOPT_PROXY_SSLCERT_BLOB
  Proxy client cert memory buffer. See \fICURLOPT_PROXY_SSLCERT_BLOB(3)\fP
  .IP CURLOPT_SSLCERTTYPE
  Client cert type.  See \fICURLOPT_SSLCERTTYPE(3)\fP
  .IP CURLOPT_PROXY_SSLCERTTYPE
  Proxy client cert type.  See \fICURLOPT_PROXY_SSLCERTTYPE(3)\fP
  .IP CURLOPT_SSLKEY
  Client key. See \fICURLOPT_SSLKEY(3)\fP
  .IP CURLOPT_SSLKEY_BLOB
  Client key memory buffer. See \fICURLOPT_SSLKEY_BLOB(3)\fP
  .IP CURLOPT_PROXY_SSLKEY
  Proxy client key. See \fICURLOPT_PROXY_SSLKEY(3)\fP
  .IP CURLOPT_PROXY_SSLKEY_BLOB
  Proxy client key. See \fICURLOPT_PROXY_SSLKEY_BLOB(3)\fP
  .IP CURLOPT_SSLKEYTYPE
  Client key type. See \fICURLOPT_SSLKEYTYPE(3)\fP
  .IP CURLOPT_PROXY_SSLKEYTYPE
  Proxy client key type. See \fICURLOPT_PROXY_SSLKEYTYPE(3)\fP
  .IP CURLOPT_KEYPASSWD
  Client key password. See \fICURLOPT_KEYPASSWD(3)\fP
  .IP CURLOPT_PROXY_KEYPASSWD
  Proxy client key password. See \fICURLOPT_PROXY_KEYPASSWD(3)\fP
  .IP CURLOPT_SSL_EC_CURVES
  Set key exchange curves. See \fICURLOPT_SSL_EC_CURVES(3)\fP
  .IP CURLOPT_SSL_ENABLE_ALPN
  Enable use of ALPN. See \fICURLOPT_SSL_ENABLE_ALPN(3)\fP
  .IP CURLOPT_SSL_ENABLE_NPN
  Enable use of NPN. See \fICURLOPT_SSL_ENABLE_NPN(3)\fP
  .IP CURLOPT_SSLENGINE
  Use identifier with SSL engine. See \fICURLOPT_SSLENGINE(3)\fP
  .IP CURLOPT_SSLENGINE_DEFAULT
  Default SSL engine. See \fICURLOPT_SSLENGINE_DEFAULT(3)\fP
  .IP CURLOPT_SSL_FALSESTART
  Enable TLS False Start. See \fICURLOPT_SSL_FALSESTART(3)\fP
  .IP CURLOPT_SSLVERSION
  SSL version to use. See \fICURLOPT_SSLVERSION(3)\fP
  .IP CURLOPT_PROXY_SSLVERSION
  Proxy SSL version to use. See \fICURLOPT_PROXY_SSLVERSION(3)\fP
  .IP CURLOPT_SSL_VERIFYHOST
  Verify the host name in the SSL certificate. See \fICURLOPT_SSL_VERIFYHOST(3)\fP
  .IP CURLOPT_DOH_SSL_VERIFYHOST
  Verify the host name in the DOH (DNS-over-HTTPS) SSL certificate. See
  \fICURLOPT_DOH_SSL_VERIFYHOST(3)\fP
  .IP CURLOPT_PROXY_SSL_VERIFYHOST
  Verify the host name in the proxy SSL certificate. See \fICURLOPT_PROXY_SSL_VERIFYHOST(3)\fP
  .IP CURLOPT_SSL_VERIFYPEER
  Verify the SSL certificate. See \fICURLOPT_SSL_VERIFYPEER(3)\fP
  .IP CURLOPT_DOH_SSL_VERIFYPEER
  Verify the DOH (DNS-over-HTTPS) SSL certificate. See
  \fICURLOPT_DOH_SSL_VERIFYPEER(3)\fP
  .IP CURLOPT_PROXY_SSL_VERIFYPEER
  Verify the proxy SSL certificate. See \fICURLOPT_PROXY_SSL_VERIFYPEER(3)\fP
  .IP CURLOPT_SSL_VERIFYSTATUS
  Verify the SSL certificate's status. See \fICURLOPT_SSL_VERIFYSTATUS(3)\fP
  .IP CURLOPT_DOH_SSL_VERIFYSTATUS
  Verify the DOH (DNS-over-HTTPS) SSL certificate's status. See
  \fICURLOPT_DOH_SSL_VERIFYSTATUS(3)\fP
  .IP CURLOPT_CAINFO
  CA cert bundle. See \fICURLOPT_CAINFO(3)\fP
  .IP CURLOPT_CAINFO_BLOB
  CA cert bundle memory buffer. See \fICURLOPT_CAINFO_BLOB(3)\fP
  .IP CURLOPT_PROXY_CAINFO
  Proxy CA cert bundle. See \fICURLOPT_PROXY_CAINFO(3)\fP
  .IP CURLOPT_PROXY_CAINFO_BLOB
  Proxy CA cert bundle memory buffer. See \fICURLOPT_PROXY_CAINFO_BLOB(3)\fP
  .IP CURLOPT_ISSUERCERT
  Issuer certificate. See \fICURLOPT_ISSUERCERT(3)\fP
  .IP CURLOPT_ISSUERCERT_BLOB
  Issuer certificate memory buffer. See \fICURLOPT_ISSUERCERT_BLOB(3)\fP
  .IP CURLOPT_PROXY_ISSUERCERT
  Proxy issuer certificate. See \fICURLOPT_PROXY_ISSUERCERT(3)\fP
  .IP CURLOPT_PROXY_ISSUERCERT_BLOB
  Proxy issuer certificate memory buffer. See \fICURLOPT_PROXY_ISSUERCERT_BLOB(3)\fP
  .IP CURLOPT_CAPATH
  Path to CA cert bundle. See \fICURLOPT_CAPATH(3)\fP
  .IP CURLOPT_PROXY_CAPATH
  Path to proxy CA cert bundle. See \fICURLOPT_PROXY_CAPATH(3)\fP
  .IP CURLOPT_CRLFILE
  Certificate Revocation List. See \fICURLOPT_CRLFILE(3)\fP
  .IP CURLOPT_PROXY_CRLFILE
  Proxy Certificate Revocation List. See \fICURLOPT_PROXY_CRLFILE(3)\fP
  .IP CURLOPT_CERTINFO
  Extract certificate info. See \fICURLOPT_CERTINFO(3)\fP
  .IP CURLOPT_PINNEDPUBLICKEY
  Set pinned SSL public key . See \fICURLOPT_PINNEDPUBLICKEY(3)\fP
  .IP CURLOPT_PROXY_PINNEDPUBLICKEY
  Set the proxy's pinned SSL public key. See
  \fICURLOPT_PROXY_PINNEDPUBLICKEY(3)\fP
  .IP CURLOPT_RANDOM_FILE
  Provide source for entropy random data. See \fICURLOPT_RANDOM_FILE(3)\fP
  .IP CURLOPT_EGDSOCKET
  Identify EGD socket for entropy. See \fICURLOPT_EGDSOCKET(3)\fP
  .IP CURLOPT_SSL_CIPHER_LIST
  Ciphers to use. See \fICURLOPT_SSL_CIPHER_LIST(3)\fP
  .IP CURLOPT_PROXY_SSL_CIPHER_LIST
  Proxy ciphers to use. See \fICURLOPT_PROXY_SSL_CIPHER_LIST(3)\fP
  .IP CURLOPT_TLS13_CIPHERS
  TLS 1.3 cipher suites to use. See \fICURLOPT_TLS13_CIPHERS(3)\fP
  .IP CURLOPT_PROXY_TLS13_CIPHERS
  Proxy TLS 1.3 cipher suites to use. See \fICURLOPT_PROXY_TLS13_CIPHERS(3)\fP
  .IP CURLOPT_SSL_SESSIONID_CACHE
  Disable SSL session-id cache. See \fICURLOPT_SSL_SESSIONID_CACHE(3)\fP
  .IP CURLOPT_SSL_OPTIONS
  Control SSL behavior. See \fICURLOPT_SSL_OPTIONS(3)\fP
  .IP CURLOPT_PROXY_SSL_OPTIONS
  Control proxy SSL behavior. See \fICURLOPT_PROXY_SSL_OPTIONS(3)\fP
  .IP CURLOPT_KRBLEVEL
  Kerberos security level. See \fICURLOPT_KRBLEVEL(3)\fP
  .IP CURLOPT_GSSAPI_DELEGATION
  Disable GSS-API delegation. See \fICURLOPT_GSSAPI_DELEGATION(3)\fP
  .SH SSH OPTIONS
  .IP CURLOPT_SSH_AUTH_TYPES
  SSH authentication types. See \fICURLOPT_SSH_AUTH_TYPES(3)\fP
  .IP CURLOPT_SSH_COMPRESSION
  Enable SSH compression. See \fICURLOPT_SSH_COMPRESSION(3)\fP
  .IP CURLOPT_SSH_HOST_PUBLIC_KEY_MD5
  MD5 of host's public key. See \fICURLOPT_SSH_HOST_PUBLIC_KEY_MD5(3)\fP
  .IP CURLOPT_SSH_PUBLIC_KEYFILE
  File name of public key. See \fICURLOPT_SSH_PUBLIC_KEYFILE(3)\fP
  .IP CURLOPT_SSH_PRIVATE_KEYFILE
  File name of private key. See \fICURLOPT_SSH_PRIVATE_KEYFILE(3)\fP
  .IP CURLOPT_SSH_KNOWNHOSTS
  File name with known hosts. See \fICURLOPT_SSH_KNOWNHOSTS(3)\fP
  .IP CURLOPT_SSH_KEYFUNCTION
  Callback for known hosts handling. See \fICURLOPT_SSH_KEYFUNCTION(3)\fP
  .IP CURLOPT_SSH_KEYDATA
  Custom pointer to pass to ssh key callback. See \fICURLOPT_SSH_KEYDATA(3)\fP
  .SH OTHER OPTIONS
  .IP CURLOPT_PRIVATE
  Private pointer to store. See \fICURLOPT_PRIVATE(3)\fP
  .IP CURLOPT_SHARE
  Share object to use. See \fICURLOPT_SHARE(3)\fP
  .IP CURLOPT_NEW_FILE_PERMS
  Mode for creating new remote files. See \fICURLOPT_NEW_FILE_PERMS(3)\fP
  .IP CURLOPT_NEW_DIRECTORY_PERMS
  Mode for creating new remote directories. See \fICURLOPT_NEW_DIRECTORY_PERMS(3)\fP
  .SH TELNET OPTIONS
  .IP CURLOPT_TELNETOPTIONS
  TELNET options. See \fICURLOPT_TELNETOPTIONS(3)\fP
  .SH RETURN VALUE
  \fICURLE_OK\fP (zero) means that the option was set properly, non-zero means an
  error occurred as \fI<curl/curl.h>\fP defines. See the \fIlibcurl-errors(3)\fP
  man page for the full list with descriptions.
  
  Strings passed on to libcurl must be shorter than 8000000 bytes, otherwise
  \fIcurl_easy_setopt(3)\fP returns \fBCURLE_BAD_FUNCTION_ARGUMENT\fP (added in
  7.65.0).
  
  \fBCURLE_BAD_FUNCTION_ARGUMENT\fP is returned when the argument to an option
  is invalid, like perhaps out of range.
  
  If you try to set an option that libcurl doesn't know about, perhaps because
  the library is too old to support it or the option was removed in a recent
  version, this function will return \fICURLE_UNKNOWN_OPTION\fP. If support for
  the option was disabled at compile-time, it will return
  \fICURLE_NOT_BUILT_IN\fP.
  .SH EXAMPLE
  .nf
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
    res = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
  .fi
  .SH "SEE ALSO"
  .BR curl_easy_init "(3), " curl_easy_cleanup "(3), " curl_easy_reset "(3), "
  .BR curl_easy_getinfo "(3), " curl_multi_setopt "(3), "
  .BR curl_easy_option_next "(3), " curl_easy_option_by_name "(3), "
  .BR curl_easy_option_by_id "(3), "