All curl_easy_setopt options listed
All existing options for curl_easy_setopt in alphabetical order.
| CURLOPT_ABSTRACT_UNIX_SOCKET | abstract Unix domain socket |
| CURLOPT_ACCEPTTIMEOUT_MS | timeout waiting for FTP server to connect back |
| CURLOPT_ACCEPT_ENCODING | automatic decompression of HTTP downloads |
| CURLOPT_ADDRESS_SCOPE | scope id for IPv6 addresses |
| CURLOPT_ALTSVC | alt-svc cache file name |
| CURLOPT_ALTSVC_CTRL | control alt-svc behavior |
| CURLOPT_APPEND | append to the remote file |
| CURLOPT_AUTOREFERER | automatically update the referer header |
| CURLOPT_AWS_SIGV4 | V4 signature |
| CURLOPT_BUFFERSIZE | receive buffer size |
| CURLOPT_CAINFO | path to Certificate Authority (CA) bundle |
| CURLOPT_CAINFO_BLOB | Certificate Authority (CA) bundle in PEM format |
| CURLOPT_CAPATH | directory holding CA certificates |
| CURLOPT_CA_CACHE_TIMEOUT | life-time for cached certificate stores |
| CURLOPT_CERTINFO | request SSL certificate information |
| CURLOPT_CHUNK_BGN_FUNCTION | callback before a transfer with FTP wildcard match |
| CURLOPT_CHUNK_DATA | pointer passed to the FTP chunk callbacks |
| CURLOPT_CHUNK_END_FUNCTION | callback after a transfer with FTP wildcard match |
| CURLOPT_CLOSESOCKETDATA | pointer passed to the socket close callback |
| CURLOPT_CLOSESOCKETFUNCTION | callback to socket close replacement |
| CURLOPT_CONNECTTIMEOUT | timeout for the connect phase |
| CURLOPT_CONNECTTIMEOUT_MS | timeout for the connect phase |
| CURLOPT_CONNECT_ONLY | stop when connected to target server |
| CURLOPT_CONNECT_TO | connect to a specific host and port instead of the URL's host and port |
| CURLOPT_CONV_FROM_NETWORK_FUNCTION | convert data from network to host encoding |
| CURLOPT_CONV_FROM_UTF8_FUNCTION | convert data from UTF8 to host encoding |
| CURLOPT_CONV_TO_NETWORK_FUNCTION | convert data to network from host encoding |
| CURLOPT_COOKIE | HTTP Cookie header |
| CURLOPT_COOKIEFILE | file name to read cookies from |
| CURLOPT_COOKIEJAR | file name to store cookies to |
| CURLOPT_COOKIELIST | add to or manipulate cookies held in memory |
| CURLOPT_COOKIESESSION | start a new cookie session |
| CURLOPT_COPYPOSTFIELDS | have libcurl copy data to POST |
| CURLOPT_CRLF | CRLF conversion |
| CURLOPT_CRLFILE | Certificate Revocation List file |
| CURLOPT_CURLU | URL in URL handle format |
| CURLOPT_CUSTOMREQUEST | custom request method |
| CURLOPT_DEBUGDATA | pointer passed to the debug callback |
| CURLOPT_DEBUGFUNCTION | debug callback |
| CURLOPT_DEFAULT_PROTOCOL | default protocol to use if the URL is missing a |
| CURLOPT_DIRLISTONLY | ask for names only in a directory listing |
| CURLOPT_DISALLOW_USERNAME_IN_URL | disallow specifying username in the URL |
| CURLOPT_DNS_CACHE_TIMEOUT | life-time for DNS cache entries |
| CURLOPT_DNS_INTERFACE | interface to speak DNS over |
| CURLOPT_DNS_LOCAL_IP4 | IPv4 address to bind DNS resolves to |
| CURLOPT_DNS_LOCAL_IP6 | IPv6 address to bind DNS resolves to |
| CURLOPT_DNS_SERVERS | DNS servers to use |
| CURLOPT_DNS_SHUFFLE_ADDRESSES | shuffle IP addresses for hostname |
| CURLOPT_DNS_USE_GLOBAL_CACHE | global DNS cache |
| CURLOPT_DOH_SSL_VERIFYHOST | verify the host name in the DoH SSL certificate |
| CURLOPT_DOH_SSL_VERIFYPEER | verify the DoH SSL certificate |
| CURLOPT_DOH_SSL_VERIFYSTATUS | verify the DoH SSL certificate's status |
| CURLOPT_DOH_URL | provide the DNS-over-HTTPS URL |
| CURLOPT_EGDSOCKET | EGD socket path |
| CURLOPT_ERRORBUFFER | error buffer for error messages |
| CURLOPT_EXPECT_100_TIMEOUT_MS | timeout for Expect: 100-continue response |
| CURLOPT_FAILONERROR | request failure on HTTP response >= 400 |
| CURLOPT_FILETIME | get the modification time of the remote resource |
| CURLOPT_FNMATCH_DATA | pointer passed to the fnmatch callback |
| CURLOPT_FNMATCH_FUNCTION | wildcard match callback |
| CURLOPT_FOLLOWLOCATION | follow HTTP 3xx redirects |
| CURLOPT_FORBID_REUSE | make connection get closed at once after use |
| CURLOPT_FRESH_CONNECT | force a new connection to be used |
| CURLOPT_FTPPORT | make FTP transfer active |
| CURLOPT_FTPSSLAUTH | order in which to attempt TLS vs SSL |
| CURLOPT_FTP_ACCOUNT | account info for FTP |
| CURLOPT_FTP_ALTERNATIVE_TO_USER | command to use instead of USER with FTP |
| CURLOPT_FTP_CREATE_MISSING_DIRS | create missing directories for FTP and SFTP |
| CURLOPT_FTP_FILEMETHOD | select directory traversing method for FTP |
| CURLOPT_FTP_SKIP_PASV_IP | ignore the IP address in the PASV response |
| CURLOPT_FTP_SSL_CCC | switch off SSL again with FTP after auth |
| CURLOPT_FTP_USE_EPRT | use EPRT for FTP |
| CURLOPT_FTP_USE_EPSV | use EPSV for FTP |
| CURLOPT_FTP_USE_PRET | use PRET for FTP |
| CURLOPT_GSSAPI_DELEGATION | allowed GSS-API delegation |
| CURLOPT_HAPPY_EYEBALLS_TIMEOUT_MS | head start for IPv6 for happy eyeballs |
| CURLOPT_HAPROXYPROTOCOL | send HAProxy PROXY protocol v1 header |
| CURLOPT_HAPROXY_CLIENT_IP | set HAProxy PROXY protocol client IP |
| CURLOPT_HEADER | pass headers to the data stream |
| CURLOPT_HEADERDATA | pointer to pass to header callback |
| CURLOPT_HEADERFUNCTION | callback that receives header data |
| CURLOPT_HEADEROPT | send HTTP headers to both proxy and host or separately |
| CURLOPT_HSTS | HSTS cache file name |
| CURLOPT_HSTSREADDATA | pointer passed to the HSTS read callback |
| CURLOPT_HSTSREADFUNCTION | read callback for HSTS hosts |
| CURLOPT_HSTSWRITEDATA | pointer passed to the HSTS write callback |
| CURLOPT_HSTSWRITEFUNCTION | write callback for HSTS hosts |
| CURLOPT_HSTS_CTRL | control HSTS behavior |
| CURLOPT_HTTP09_ALLOWED | allow HTTP/0.9 response |
| CURLOPT_HTTP200ALIASES | alternative matches for HTTP 200 OK |
| CURLOPT_HTTPAUTH | HTTP server authentication methods to try |
| CURLOPT_HTTPGET | ask for an HTTP GET request |
| CURLOPT_HTTPHEADER | set of HTTP headers |
| CURLOPT_HTTPPOST | multipart formpost content |
| CURLOPT_HTTPPROXYTUNNEL | tunnel through HTTP proxy |
| CURLOPT_HTTP_CONTENT_DECODING | HTTP content decoding control |
| CURLOPT_HTTP_TRANSFER_DECODING | HTTP transfer decoding control |
| CURLOPT_HTTP_VERSION | HTTP protocol version to use |
| CURLOPT_IGNORE_CONTENT_LENGTH | ignore content length |
| CURLOPT_INFILESIZE | size of the input file to send off |
| CURLOPT_INFILESIZE_LARGE | size of the input file to send off |
| CURLOPT_INTERFACE | source interface for outgoing traffic |
| CURLOPT_INTERLEAVEDATA | pointer passed to RTSP interleave callback |
| CURLOPT_INTERLEAVEFUNCTION | callback for RTSP interleaved data |
| CURLOPT_IOCTLDATA | pointer passed to I/O callback |
| CURLOPT_IOCTLFUNCTION | callback for I/O operations |
| CURLOPT_IPRESOLVE | IP protocol version to use |
| CURLOPT_ISSUERCERT | issuer SSL certificate filename |
| CURLOPT_ISSUERCERT_BLOB | issuer SSL certificate from memory blob |
| CURLOPT_KEEP_SENDING_ON_ERROR | keep sending on early HTTP response >= 300 |
| CURLOPT_KEYPASSWD | passphrase to private key |
| CURLOPT_KRBLEVEL | FTP kerberos security level |
| CURLOPT_LOCALPORT | local port number to use for socket |
| CURLOPT_LOCALPORTRANGE | number of additional local ports to try |
| CURLOPT_LOGIN_OPTIONS | login options |
| CURLOPT_LOW_SPEED_LIMIT | low speed limit in bytes per second |
| CURLOPT_LOW_SPEED_TIME | low speed limit time period |
| CURLOPT_MAIL_AUTH | SMTP authentication address |
| CURLOPT_MAIL_FROM | SMTP sender address |
| CURLOPT_MAIL_RCPT | list of SMTP mail recipients |
| CURLOPT_MAIL_RCPT_ALLOWFAILS | allow RCPT TO command to fail for some recipients |
| CURLOPT_MAXAGE_CONN | max idle time allowed for reusing a connection |
| CURLOPT_MAXCONNECTS | maximum connection cache size |
| CURLOPT_MAXFILESIZE | maximum file size allowed to download |
| CURLOPT_MAXFILESIZE_LARGE | maximum file size allowed to download |
| CURLOPT_MAXLIFETIME_CONN | max lifetime (since creation) allowed for reusing a connection |
| CURLOPT_MAXREDIRS | maximum number of redirects allowed |
| CURLOPT_MAX_RECV_SPEED_LARGE | rate limit data download speed |
| CURLOPT_MAX_SEND_SPEED_LARGE | rate limit data upload speed |
| CURLOPT_MIMEPOST | send data from mime structure |
| CURLOPT_MIME_OPTIONS | set MIME option flags |
| CURLOPT_NETRC | enable use of .netrc |
| CURLOPT_NETRC_FILE | file name to read .netrc info from |
| CURLOPT_NEW_DIRECTORY_PERMS | permissions for remotely created directories |
| CURLOPT_NEW_FILE_PERMS | permissions for remotely created files |
| CURLOPT_NOBODY | do the download request without getting the body |
| CURLOPT_NOPROGRESS | switch off the progress meter |
| CURLOPT_NOPROXY | disable proxy use for specific hosts |
| CURLOPT_NOSIGNAL | skip all signal handling |
| CURLOPT_OPENSOCKETDATA | pointer passed to open socket callback |
| CURLOPT_OPENSOCKETFUNCTION | callback for opening socket |
| CURLOPT_PASSWORD | password to use in authentication |
| CURLOPT_PATH_AS_IS | do not handle dot dot sequences |
| CURLOPT_PINNEDPUBLICKEY | pinned public key |
| CURLOPT_PIPEWAIT | wait for multiplexing |
| CURLOPT_PORT | remote port number to connect to |
| CURLOPT_POST | make an HTTP POST |
| CURLOPT_POSTFIELDS | data to POST to server |
| CURLOPT_POSTFIELDSIZE | size of POST data pointed to |
| CURLOPT_POSTFIELDSIZE_LARGE | size of POST data pointed to |
| CURLOPT_POSTQUOTE | (S)FTP commands to run after the transfer |
| CURLOPT_POSTREDIR | how to act on an HTTP POST redirect |
| CURLOPT_PREQUOTE | commands to run before an FTP transfer |
| CURLOPT_PREREQDATA | pointer passed to the pre-request callback |
| CURLOPT_PREREQFUNCTION | user callback called when a connection has been |
| CURLOPT_PRE_PROXY | pre-proxy host to use |
| CURLOPT_PRIVATE | store a private pointer |
| CURLOPT_PROGRESSDATA | pointer passed to the progress callback |
| CURLOPT_PROGRESSFUNCTION | progress meter callback |
| CURLOPT_PROTOCOLS | allowed protocols |
| CURLOPT_PROTOCOLS_STR | allowed protocols |
| CURLOPT_PROXY | proxy to use |
| CURLOPT_PROXYAUTH | HTTP proxy authentication methods |
| CURLOPT_PROXYHEADER | set of HTTP headers to pass to proxy |
| CURLOPT_PROXYPASSWORD | password to use with proxy authentication |
| CURLOPT_PROXYPORT | port number the proxy listens on |
| CURLOPT_PROXYTYPE | proxy protocol type |
| CURLOPT_PROXYUSERNAME | user name to use for proxy authentication |
| CURLOPT_PROXYUSERPWD | user name and password to use for proxy authentication |
| CURLOPT_PROXY_CAINFO | path to proxy Certificate Authority (CA) bundle |
| CURLOPT_PROXY_CAINFO_BLOB | proxy Certificate Authority (CA) bundle in PEM format |
| CURLOPT_PROXY_CAPATH | directory holding HTTPS proxy CA certificates |
| CURLOPT_PROXY_CRLFILE | HTTPS proxy Certificate Revocation List file |
| CURLOPT_PROXY_ISSUERCERT | proxy issuer SSL certificate filename |
| CURLOPT_PROXY_ISSUERCERT_BLOB | proxy issuer SSL certificate from memory blob |
| CURLOPT_PROXY_KEYPASSWD | passphrase for the proxy private key |
| CURLOPT_PROXY_PINNEDPUBLICKEY | pinned public key for https proxy |
| CURLOPT_PROXY_SERVICE_NAME | proxy authentication service name |
| CURLOPT_PROXY_SSLCERT | HTTPS proxy client certificate |
| CURLOPT_PROXY_SSLCERTTYPE | type of the proxy client SSL certificate |
| CURLOPT_PROXY_SSLCERT_BLOB | SSL proxy client certificate from memory blob |
| CURLOPT_PROXY_SSLKEY | private key file for HTTPS proxy client cert |
| CURLOPT_PROXY_SSLKEYTYPE | type of the proxy private key file |
| CURLOPT_PROXY_SSLKEY_BLOB | private key for proxy cert from memory blob |
| CURLOPT_PROXY_SSLVERSION | preferred HTTPS proxy TLS version |
| CURLOPT_PROXY_SSL_CIPHER_LIST | ciphers to use for HTTPS proxy |
| CURLOPT_PROXY_SSL_OPTIONS | HTTPS proxy SSL behavior options |
| CURLOPT_PROXY_SSL_VERIFYHOST | verify the proxy certificate's name against host |
| CURLOPT_PROXY_SSL_VERIFYPEER | verify the proxy's SSL certificate |
| CURLOPT_PROXY_TLS13_CIPHERS | ciphers suites for proxy TLS 1.3 |
| CURLOPT_PROXY_TLSAUTH_PASSWORD | password to use for proxy TLS authentication |
| CURLOPT_PROXY_TLSAUTH_TYPE | HTTPS proxy TLS authentication methods |
| CURLOPT_PROXY_TLSAUTH_USERNAME | user name to use for proxy TLS authentication |
| CURLOPT_PROXY_TRANSFER_MODE | append FTP transfer mode to URL for proxy |
| CURLOPT_PUT | make an HTTP PUT request |
| CURLOPT_QUICK_EXIT | allow to exit quickly |
| CURLOPT_QUOTE | (S)FTP commands to run before transfer |
| CURLOPT_RANDOM_FILE | file to read random data from |
| CURLOPT_RANGE | byte range to request |
| CURLOPT_READDATA | pointer passed to the read callback |
| CURLOPT_READFUNCTION | read callback for data uploads |
| CURLOPT_REDIR_PROTOCOLS | protocols allowed to redirect to |
| CURLOPT_REDIR_PROTOCOLS_STR | protocols allowed to redirect to |
| CURLOPT_REFERER | the HTTP referer header |
| CURLOPT_REQUEST_TARGET | alternative target for this request |
| CURLOPT_RESOLVE | provide custom host name to IP address resolves |
| CURLOPT_RESOLVER_START_DATA | pointer passed to the resolver start callback |
| CURLOPT_RESOLVER_START_FUNCTION | callback called before a new name resolve is started |
| CURLOPT_RESUME_FROM | offset to resume transfer from |
| CURLOPT_RESUME_FROM_LARGE | offset to resume transfer from |
| CURLOPT_RTSP_CLIENT_CSEQ | RTSP client CSEQ number |
| CURLOPT_RTSP_REQUEST | RTSP request |
| CURLOPT_RTSP_SERVER_CSEQ | RTSP server CSEQ number |
| CURLOPT_RTSP_SESSION_ID | RTSP session ID |
| CURLOPT_RTSP_STREAM_URI | RTSP stream URI |
| CURLOPT_RTSP_TRANSPORT | RTSP Transport: header |
| CURLOPT_SASL_AUTHZID | authorization identity (identity to act as) |
| CURLOPT_SASL_IR | send initial response in first packet |
| CURLOPT_SEEKDATA | pointer passed to the seek callback |
| CURLOPT_SEEKFUNCTION | user callback for seeking in input stream |
| CURLOPT_SERVER_RESPONSE_TIMEOUT | time allowed to wait for server response |
| CURLOPT_SERVICE_NAME | authentication service name |
| CURLOPT_SHARE | share handle to use |
| CURLOPT_SOCKOPTDATA | pointer to pass to sockopt callback |
| CURLOPT_SOCKOPTFUNCTION | callback for setting socket options |
| CURLOPT_SOCKS5_AUTH | methods for SOCKS5 proxy authentication |
| CURLOPT_SOCKS5_GSSAPI_NEC | SOCKS proxy GSSAPI negotiation protection |
| CURLOPT_SOCKS5_GSSAPI_SERVICE | SOCKS5 proxy authentication service name |
| CURLOPT_SSH_AUTH_TYPES | auth types for SFTP and SCP |
| CURLOPT_SSH_COMPRESSION | enable SSH compression |
| CURLOPT_SSH_HOSTKEYDATA | pointer to pass to the SSH host key callback |
| CURLOPT_SSH_HOSTKEYFUNCTION | callback to check host key |
| CURLOPT_SSH_HOST_PUBLIC_KEY_MD5 | MD5 checksum of SSH server public key |
| CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256 | SHA256 hash of SSH server public key |
| CURLOPT_SSH_KEYDATA | pointer passed to the SSH key callback |
| CURLOPT_SSH_KEYFUNCTION | callback for known host matching logic |
| CURLOPT_SSH_KNOWNHOSTS | file name holding the SSH known hosts |
| CURLOPT_SSH_PRIVATE_KEYFILE | private key file for SSH auth |
| CURLOPT_SSH_PUBLIC_KEYFILE | public key file for SSH auth |
| CURLOPT_SSLCERT | SSL client certificate |
| CURLOPT_SSLCERTTYPE | type of client SSL certificate |
| CURLOPT_SSLCERT_BLOB | SSL client certificate from memory blob |
| CURLOPT_SSLENGINE | SSL engine identifier |
| CURLOPT_SSLENGINE_DEFAULT | make SSL engine default |
| CURLOPT_SSLKEY | private key file for TLS and SSL client cert |
| CURLOPT_SSLKEYTYPE | type of the private key file |
| CURLOPT_SSLKEY_BLOB | private key for client cert from memory blob |
| CURLOPT_SSLVERSION | preferred TLS/SSL version |
| CURLOPT_SSL_CIPHER_LIST | ciphers to use for TLS |
| CURLOPT_SSL_CTX_DATA | pointer passed to SSL context callback |
| CURLOPT_SSL_CTX_FUNCTION | SSL context callback for OpenSSL, wolfSSL or mbedTLS |
| CURLOPT_SSL_EC_CURVES | key exchange curves |
| CURLOPT_SSL_ENABLE_ALPN | Application Layer Protocol Negotiation |
| CURLOPT_SSL_ENABLE_NPN | use NPN |
| CURLOPT_SSL_FALSESTART | TLS false start |
| CURLOPT_SSL_OPTIONS | SSL behavior options |
| CURLOPT_SSL_SESSIONID_CACHE | use the SSL session-ID cache |
| CURLOPT_SSL_VERIFYHOST | verify the certificate's name against host |
| CURLOPT_SSL_VERIFYPEER | verify the peer's SSL certificate |
| CURLOPT_SSL_VERIFYSTATUS | verify the certificate's status |
| CURLOPT_STDERR | redirect stderr to another stream |
| CURLOPT_STREAM_DEPENDS | stream this transfer depends on |
| CURLOPT_STREAM_DEPENDS_E | stream this transfer depends on exclusively |
| CURLOPT_STREAM_WEIGHT | numerical stream weight |
| CURLOPT_SUPPRESS_CONNECT_HEADERS | suppress proxy CONNECT response headers from user callbacks |
| CURLOPT_TCP_FASTOPEN | TCP Fast Open |
| CURLOPT_TCP_KEEPALIVE | TCP keep-alive probing |
| CURLOPT_TCP_KEEPIDLE | TCP keep-alive idle time wait |
| CURLOPT_TCP_KEEPINTVL | TCP keep-alive interval |
| CURLOPT_TCP_NODELAY | the TCP_NODELAY option |
| CURLOPT_TELNETOPTIONS | set of telnet options |
| CURLOPT_TFTP_BLKSIZE | TFTP block size |
| CURLOPT_TFTP_NO_OPTIONS | send no TFTP options requests |
| CURLOPT_TIMECONDITION | select condition for a time request |
| CURLOPT_TIMEOUT | maximum time the transfer is allowed to complete |
| CURLOPT_TIMEOUT_MS | maximum time the transfer is allowed to complete |
| CURLOPT_TIMEVALUE | time value for conditional |
| CURLOPT_TIMEVALUE_LARGE | time value for conditional |
| CURLOPT_TLS13_CIPHERS | ciphers suites to use for TLS 1.3 |
| CURLOPT_TLSAUTH_PASSWORD | password to use for TLS authentication |
| CURLOPT_TLSAUTH_TYPE | TLS authentication methods |
| CURLOPT_TLSAUTH_USERNAME | user name to use for TLS authentication |
| CURLOPT_TRAILERDATA | pointer passed to trailing headers callback |
| CURLOPT_TRAILERFUNCTION | callback for sending trailing headers |
| CURLOPT_TRANSFERTEXT | request a text based transfer for FTP |
| CURLOPT_TRANSFER_ENCODING | ask for HTTP Transfer Encoding |
| CURLOPT_UNIX_SOCKET_PATH | Unix domain socket |
| CURLOPT_UNRESTRICTED_AUTH | send credentials to other hosts too |
| CURLOPT_UPKEEP_INTERVAL_MS | connection upkeep interval |
| CURLOPT_UPLOAD | data upload |
| CURLOPT_UPLOAD_BUFFERSIZE | upload buffer size |
| CURLOPT_URL | URL for this transfer |
| CURLOPT_USERAGENT | HTTP user-agent header |
| CURLOPT_USERNAME | user name to use in authentication |
| CURLOPT_USERPWD | user name and password to use in authentication |
| CURLOPT_USE_SSL | request using SSL / TLS for the transfer |
| CURLOPT_VERBOSE | verbose mode |
| CURLOPT_WILDCARDMATCH | directory wildcard transfers |
| CURLOPT_WRITEDATA | pointer passed to the write callback |
| CURLOPT_WRITEFUNCTION | callback for writing received data |
| CURLOPT_WS_OPTIONS | WebSocket behavior options |
| CURLOPT_XFERINFODATA | pointer passed to the progress callback |
| CURLOPT_XFERINFOFUNCTION | progress meter callback |
| CURLOPT_XOAUTH2_BEARER | OAuth 2.0 access token |