CURLOPT_CONNECT_ONLY - stop when connected to target server
#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CONNECT_ONLY, long only);
CURLOPT_CONNECT_ONLY(3) curl_easy_setopt options CURLOPT_CONNECT_ONLY(3) NAME CURLOPT_CONNECT_ONLY - stop when connected to target server SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CONNECT_ONLY, long only); DESCRIPTION Pass a long. If the parameter equals 1, it tells the library to perform all the required proxy authentication and connection setup, but no data transfer, and then return. The option can be used to simply test a connection to a server, but is more useful when used with the CURLINFO_ACTIVESOCKET(3) option to curl_easy_getinfo(3) as the library can set up the connection and then the application can obtain the most recently used socket for special data transfers. Transfers marked connect only will not reuse any existing connections and connections marked connect only will not be allowed to get reused. DEFAULT 0 PROTOCOLS HTTP, SMTP, POP3 and IMAP EXAMPLE CURL *curl = curl_easy_init(); if(curl) { CURLcode ret; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/"); curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 1L); ret = curl_easy_perform(curl); if(ret == CURLE_OK) { /* only connected! */ } } AVAILABILITY Added in 7.15.2 RETURN VALUE Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. ATTRIBUTES See attributes(7) for descriptions of the following attributes: +---------------+------------------+ |ATTRIBUTE TYPE | ATTRIBUTE VALUE | +---------------+------------------+ |Availability | web/curl | +---------------+------------------+ |Stability | Uncommitted | +---------------+------------------+ SEE ALSO CURLOPT_VERBOSE(3), CURLOPT_HTTPPROXYTUNNEL(3), curl_easy_recv(3), curl_easy_send(3) NOTES Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source- code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from https://curl.se/down- load/curl-7.83.1.tar.bz2. Further information about this software can be found on the open source community website at http://curl.haxx.se/. libcurl 7.83.1 November 26, 2021 CURLOPT_CONNECT_ONLY(3)