curl options as a C enum (via https://docwiki.embarcadero.com/Libraries/Athens/en/System.Curl.CURLoption and Gemini)

curl_opt.h

/**
 * @brief Enumeration of options for curl_easy_setopt() based on libcurl.
 *
 * Note: The explicit integer values match those used by libcurl.
 * Options without explicit values increment from the previous one.
 */
typedef enum {
    /* Options expecting a long */
    CURLOPT_PORT = 3,
    CURLOPT_TIMEOUT = 13,
    CURLOPT_INFILESIZE = 14, // Implicitly 13 + 1
    CURLOPT_LOW_SPEED_LIMIT = 19,
    CURLOPT_LOW_SPEED_TIME = 20, // Implicitly 19 + 1
    CURLOPT_RESUME_FROM = 21, // Implicitly 20 + 1
    CURLOPT_CRLF = 27,
    CURLOPT_SSLVERSION = 32,
    CURLOPT_TIMECONDITION = 33, // Implicitly 32 + 1
    CURLOPT_TIMEVALUE = 34, // Implicitly 33 + 1
    CURLOPT_VERBOSE = 41,
    CURLOPT_HEADER = 42, // Implicitly 41 + 1
    CURLOPT_NOPROGRESS = 43, // Implicitly 42 + 1
    CURLOPT_NOBODY = 44, // Implicitly 43 + 1
    CURLOPT_FAILONERROR = 45, // Implicitly 44 + 1
    CURLOPT_UPLOAD = 46, // Implicitly 45 + 1
    CURLOPT_POST = 47, // Implicitly 46 + 1
    CURLOPT_DIRLISTONLY = 48, // Implicitly 47 + 1
    CURLOPT_APPEND = 50,
    CURLOPT_NETRC = 51, // Implicitly 50 + 1
    CURLOPT_FOLLOWLOCATION = 52, // Implicitly 51 + 1
    CURLOPT_TRANSFERTEXT = 53, // Implicitly 52 + 1
    CURLOPT_PUT = 54, // Implicitly 53 + 1
    CURLOPT_AUTOREFERER = 58,
    CURLOPT_PROXYPORT = 59, // Implicitly 58 + 1
    CURLOPT_POSTFIELDSIZE = 60, // Implicitly 59 + 1
    CURLOPT_HTTPPROXYTUNNEL = 61, // Implicitly 60 + 1
    CURLOPT_SSL_VERIFYPEER = 64,
    CURLOPT_MAXREDIRS = 68,
    CURLOPT_FILETIME = 69, // Implicitly 68 + 1
    CURLOPT_MAXCONNECTS = 71,
    CURLOPT_CLOSEPOLICY = 72, // Implicitly 71 + 1 (Deprecated)
    CURLOPT_FRESH_CONNECT = 74,
    CURLOPT_FORBID_REUSE = 75, // Implicitly 74 + 1
    CURLOPT_CONNECTTIMEOUT = 78,
    CURLOPT_HTTPGET = 80,
    CURLOPT_SSL_VERIFYHOST = 81, // Implicitly 80 + 1
    CURLOPT_HTTP_VERSION = 84,
    CURLOPT_FTP_USE_EPSV = 85, // Implicitly 84 + 1
    CURLOPT_SSLENGINE_DEFAULT = 90,
    CURLOPT_DNS_USE_GLOBAL_CACHE = 91, // Implicitly 90 + 1 (Deprecated)
    CURLOPT_DNS_CACHE_TIMEOUT = 92, // Implicitly 91 + 1
    CURLOPT_COOKIESESSION = 96,
    CURLOPT_BUFFERSIZE = 98,
    CURLOPT_NOSIGNAL = 99, // Implicitly 98 + 1
    CURLOPT_PROXYTYPE = 101,
    CURLOPT_UNRESTRICTED_AUTH = 105,
    CURLOPT_FTP_USE_EPRT = 106, // Implicitly 105 + 1
    CURLOPT_HTTPAUTH = 107, // Implicitly 106 + 1
    CURLOPT_FTP_CREATE_MISSING_DIRS = 110,
    CURLOPT_PROXYAUTH = 111, // Implicitly 110 + 1
    CURLOPT_FTP_RESPONSE_TIMEOUT = 112,
    CURLOPT_SERVER_RESPONSE_TIMEOUT = 113, // Implicitly 112 + 1 (Renamed, use CURLOPT_FTP_RESPONSE_TIMEOUT)
    CURLOPT_IPRESOLVE = 113, // Implicitly 112 + 1
    CURLOPT_MAXFILESIZE = 114, // Implicitly 113 + 1
    CURLOPT_USE_SSL = 119, // Deprecated, use CURLOPT_SSL_ENABLE_ALPN / NPN or specific SSL versions
    CURLOPT_TCP_NODELAY = 121,
    CURLOPT_FTPSSLAUTH = 129,
    CURLOPT_IGNORE_CONTENT_LENGTH = 136,
    CURLOPT_FTP_SKIP_PASV_IP = 137, // Implicitly 136 + 1
    CURLOPT_FTP_FILEMETHOD = 138, // Implicitly 137 + 1
    CURLOPT_LOCALPORT = 139, // Implicitly 138 + 1
    CURLOPT_LOCALPORTRANGE = 140, // Implicitly 139 + 1
    CURLOPT_CONNECTONLY = 141, // Implicitly 140 + 1
    CURLOPT_SSL_SESSIONID_CACHE = 150,
    CURLOPT_SSH_AUTH_TYPES = 151, // Implicitly 150 + 1
    CURLOPT_FTP_SSL_CCC = 154,
    CURLOPT_TIMEOUT_MS = 155, // Implicitly 154 + 1
    CURLOPT_CONNECTTIMEOUT_MS = 156, // Implicitly 155 + 1
    CURLOPT_HTTP_TRANSFER_DECODING = 157, // Implicitly 156 + 1
    CURLOPT_HTTP_CONTENT_DECODING = 158, // Implicitly 157 + 1
    CURLOPT_NEW_FILE_PERMS = 159, // Implicitly 158 + 1
    CURLOPT_NEW_DIRECTORY_PERMS = 160, // Implicitly 159 + 1
    CURLOPT_POSTREDIR = 161, // Implicitly 160 + 1
    CURLOPT_PROXY_TRANSFER_MODE = 166,
    CURLOPT_ADDRESS_SCOPE = 171,
    CURLOPT_CERTINFO = 172, // Implicitly 171 + 1
    CURLOPT_TFTP_BLKSIZE = 178,
    CURLOPT_SOCKS5_GSSAPI_NEC = 180,
    CURLOPT_PROTOCOLS = 181, // Implicitly 180 + 1
    CURLOPT_REDIR_PROTOCOLS = 182, // Implicitly 181 + 1
    CURLOPT_FTP_USE_PRET = 188,
    CURLOPT_RTSP_REQUEST = 189, // Implicitly 188 + 1
    CURLOPT_RTSP_CLIENT_CSEQ = 193,
    CURLOPT_RTSP_SERVER_CSEQ = 194, // Implicitly 193 + 1
    CURLOPT_WILDCARDMATCH = 197,
    CURLOPT_TRANSFER_ENCODING = 207,
    CURLOPT_GSSAPI_DELEGATION = 210,
    CURLOPT_ACCEPTTIMEOUT_MS = 212,
    CURLOPT_TCP_KEEPALIVE = 213, // Implicitly 212 + 1
    CURLOPT_TCP_KEEPIDLE = 214, // Implicitly 213 + 1
    CURLOPT_TCP_KEEPINTVL = 215, // Implicitly 214 + 1
    CURLOPT_SSL_OPTIONS = 216, // Implicitly 215 + 1
    CURLOPT_SASL_IR = 218,
    CURLOPT_SSL_ENABLE_NPN = 225, // Deprecated
    CURLOPT_SSL_ENABLE_ALPN = 226, // Implicitly 225 + 1
    CURLOPT_EXPECT_100_TIMEOUT_MS = 227, // Implicitly 226 + 1
    CURLOPT_HEADEROPT = 229,
    CURLOPT_SSL_VERIFYSTATUS = 232,
    CURLOPT_SSL_FALSESTART = 233, // Implicitly 232 + 1
    CURLOPT_PATH_AS_IS = 234, // Implicitly 233 + 1
    CURLOPT_PIPEWAIT = 237,
    CURLOPT_STREAM_WEIGHT = 239,

    /* Options expecting a pointer */
    CURLOPT_WRITEDATA = 10001,
    CURLOPT_URL = 10002, // Implicitly 10001 + 1
    CURLOPT_PROXY = 10004,
    CURLOPT_USERPWD = 10005, // Implicitly 10004 + 1
    CURLOPT_PROXYUSERPWD = 10006, // Implicitly 10005 + 1
    CURLOPT_RANGE = 10007, // Implicitly 10006 + 1
    CURLOPT_READDATA = 10009,
    CURLOPT_ERRORBUFFER = 10010, // Implicitly 10009 + 1
    CURLOPT_POSTFIELDS = 10015,
    CURLOPT_REFERER = 10016, // Implicitly 10015 + 1
    CURLOPT_FTPPORT = 10017, // Implicitly 10016 + 1
    CURLOPT_USERAGENT = 10018, // Implicitly 10017 + 1
    CURLOPT_COOKIE = 10022,
    CURLOPT_HTTPHEADER = 10023, // Implicitly 10022 + 1 (curl_slist *)
    CURLOPT_HTTPPOST = 10024, // Implicitly 10023 + 1 (curl_httppost *)
    CURLOPT_SSLCERT = 10025, // Implicitly 10024 + 1
    CURLOPT_KEYPASSWD = 10026, // Implicitly 10025 + 1
    CURLOPT_QUOTE = 10028, // (curl_slist *)
    CURLOPT_HEADERDATA = 10029, // Implicitly 10028 + 1 (Same as CURLOPT_WRITEDATA)
    CURLOPT_COOKIEFILE = 10031,
    CURLOPT_CUSTOMREQUEST = 10036,
    CURLOPT_STDERR = 10037, // Implicitly 10036 + 1 (FILE *)
    CURLOPT_POSTQUOTE = 10039, // (curl_slist *)
    CURLOPT_OBSOLETE40 = 10040, // Implicitly 10039 + 1 (No longer used)
    CURLOPT_PROGRESSDATA = 10057,
    CURLOPT_INTERFACE = 10062,
    CURLOPT_KRBLEVEL = 10063, // Implicitly 10062 + 1
    CURLOPT_CAINFO = 10065,
    CURLOPT_TELNETOPTIONS = 10070, // (curl_slist *)
    CURLOPT_RANDOM_FILE = 10076,
    CURLOPT_EGDSOCKET = 10077, // Implicitly 10076 + 1
    CURLOPT_COOKIEJAR = 10082,
    CURLOPT_SSL_CIPHER_LIST = 10083, // Implicitly 10082 + 1
    CURLOPT_SSLCERTTYPE = 10086,
    CURLOPT_SSLKEY = 10087, // Implicitly 10086 + 1
    CURLOPT_SSLKEYTYPE = 10088, // Implicitly 10087 + 1
    CURLOPT_SSLENGINE = 10089, // Implicitly 10088 + 1
    CURLOPT_PREQUOTE = 10093, // (curl_slist *)
    CURLOPT_DEBUGDATA = 10094, // Implicitly 10093 + 1
    CURLOPT_CAPATH = 10097,
    CURLOPT_SHARE = 10100, // (CURLSH *)
    CURLOPT_ENCODING = 10102, // Renamed, use CURLOPT_ACCEPT_ENCODING
    CURLOPT_PRIVATE = 10103, // Implicitly 10102 + 1
    CURLOPT_HTTP200ALIASES = 10104, // Implicitly 10103 + 1 (curl_slist *)
    CURLOPT_SSL_CTX_DATA = 10109,
    CURLOPT_NETRC_FILE = 10118,
    CURLOPT_SOURCE_USERPWD = 10123, // Removed
    CURLOPT_SOURCE_PREQUOTE = 10127, // Removed
    CURLOPT_SOURCE_POSTQUOTE = 10128, // Implicitly 10127 + 1 (Removed)
    CURLOPT_IOCTLDATA = 10130, // Implicitly 10128 + 2 (Removed)
    CURLOPT_SOURCE_URL = 10132, // Implicitly 10130 + 2 (Removed)
    CURLOPT_SOURCE_QUOTE = 10133, // Implicitly 10132 + 1 (Removed)
    CURLOPT_FTP_ACCOUNT = 10134, // Implicitly 10133 + 1
    CURLOPT_COOKIELIST = 10135, // Implicitly 10134 + 1
    CURLOPT_FTP_ALTERNATIVE_TO_USER = 10147,
    CURLOPT_SOCKOPTDATA = 10148, // Implicitly 10147 + 1
    CURLOPT_SSH_PUBLIC_KEYFILE = 10152,
    CURLOPT_SSH_PRIVATE_KEYFILE = 10153, // Implicitly 10152 + 1
    CURLOPT_SSH_HOST_PUBLIC_KEY_MD5 = 10162,
    CURLOPT_OPENSOCKETDATA = 10163, // Implicitly 10162 + 1
    CURLOPT_COPYPOSTFIELDS = 10165, // Implicitly 10163 + 2
    CURLOPT_SEEKDATA = 10167, // Implicitly 10165 + 2
    CURLOPT_CRLFILE = 10169, // Implicitly 10167 + 2
    CURLOPT_ISSUERCERT = 10170, // Implicitly 10169 + 1
    CURLOPT_USERNAME = 10173,
    CURLOPT_PASSWORD = 10174, // Implicitly 10173 + 1
    CURLOPT_PROXYUSERNAME = 10175, // Implicitly 10174 + 1
    CURLOPT_PROXYPASSWORD = 10176, // Implicitly 10175 + 1
    CURLOPT_NOPROXY = 10177, // Implicitly 10176 + 1
    CURLOPT_SOCKS5_GSSAPI_SERVICE = 10179,
    CURLOPT_SSH_KNOWNHOSTS = 10183,
    CURLOPT_SSH_KEYDATA = 10185,
    CURLOPT_MAIL_FROM = 10186, // Implicitly 10185 + 1
    CURLOPT_MAIL_RCPT = 10187, // Implicitly 10186 + 1 (curl_slist *)
    CURLOPT_RTSP_SESSION_ID = 10190,
    CURLOPT_RTSP_STREAM_URI = 10191, // Implicitly 10190 + 1
    CURLOPT_RTSP_TRANSPORT = 10192, // Implicitly 10191 + 1
    CURLOPT_INTERLEAVEDATA = 10194, // Implicitly 10192 + 2
    CURLOPT_CHUNK_DATA = 10198, // Implicitly 10194 + 4
    CURLOPT_FNMATCH_DATA = 10200, // Implicitly 10198 + 2
    CURLOPT_RESOLVE = 10203, // Implicitly 10200 + 3 (curl_slist *)
    CURLOPT_TLSAUTH_USERNAME = 10204, // Implicitly 10203 + 1
    CURLOPT_TLSAUTH_PASSWORD = 10205, // Implicitly 10204 + 1
    CURLOPT_TLSAUTH_TYPE = 10206, // Implicitly 10205 + 1
    CURLOPT_CLOSESOCKETDATA = 10208, // Implicitly 10206 + 2
    CURLOPT_DNS_SERVERS = 10211,
    CURLOPT_MAIL_AUTH = 10217,
    CURLOPT_XOAUTH2_BEARER = 10220,
    CURLOPT_DNS_INTERFACE = 10221, // Implicitly 10220 + 1
    CURLOPT_DNS_LOCAL_IP4 = 10222, // Implicitly 10221 + 1
    CURLOPT_DNS_LOCAL_IP6 = 10223, // Implicitly 10222 + 1
    CURLOPT_LOGIN_OPTIONS = 10224, // Implicitly 10223 + 1
    CURLOPT_PROXYHEADER = 10228, // (curl_slist *)
    CURLOPT_PINNEDPUBLICKEY = 10230,
    CURLOPT_UNIX_SOCKET_PATH = 10231, // Implicitly 10230 + 1
    CURLOPT_PROXY_SERVICE_NAME = 10234, // Implicitly 10231 + 3
    CURLOPT_SERVICE_NAME = 10235, // Implicitly 10234 + 1
    CURLOPT_DEFAULT_PROTOCOL = 10238,
    CURLOPT_STREAM_DEPENDS = 10240, // (CURL *)
    CURLOPT_STREAM_DEPENDS_E = 10241, // Implicitly 10240 + 1 (CURL *)

    /* Options expecting a function pointer */
    CURLOPT_WRITEFUNCTION = 20011,
    CURLOPT_READFUNCTION = 20012, // Implicitly 20011 + 1
    CURLOPT_PROGRESSFUNCTION = 20056,
    CURLOPT_HEADERFUNCTION = 20079,
    CURLOPT_DEBUGFUNCTION = 20094,
    CURLOPT_SSL_CTX_FUNCTION = 20108,
    CURLOPT_IOCTLFUNCTION = 20130, // Removed
    CURLOPT_CONV_FROM_NETWORK_FUNCTION = 20142,
    CURLOPT_CONV_TO_NETWORK_FUNCTION = 20143, // Implicitly 20142 + 1
    CURLOPT_CONV_FROM_UTF8_FUNCTION = 20144, // Implicitly 20143 + 1
    CURLOPT_SOCKOPTFUNCTION = 20148,
    CURLOPT_OPENSOCKETFUNCTION = 20163,
    CURLOPT_SEEKFUNCTION = 20167,
    CURLOPT_SSH_KEYFUNCTION = 20184,
    CURLOPT_INTERLEAVEFUNCTION = 20196,
    CURLOPT_CHUNK_BGN_FUNCTION = 20198,
    CURLOPT_CHUNK_END_FUNCTION = 20199, // Implicitly 20198 + 1
    CURLOPT_FNMATCH_FUNCTION = 20200, // Implicitly 20199 + 1
    CURLOPT_CLOSESOCKETFUNCTION = 20208,
    CURLOPT_XFERINFOFUNCTION = 20219,

    /* Options expecting a curl_off_t */
    CURLOPT_INFILESIZE_LARGE = 30114, // Implicitly 20219 + 9895
    CURLOPT_RESUME_FROM_LARGE = 30116, // Implicitly 30114 + 2
    CURLOPT_MAXFILESIZE_LARGE = 30117, // Implicitly 30116 + 1
    CURLOPT_POSTFIELDSIZE_LARGE = 30120,
    CURLOPT_MAX_SEND_SPEED_LARGE = 30145,
    CURLOPT_MAX_RECV_SPEED_LARGE = 30146, // Implicitly 30145 + 1

    CURLOPT_LASTENTRY /* Never use! */ // Implicitly 30146 + 1 = 30147

} CURLoption;