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CURLOPT_IPRESOLVE(3)                libcurl               CURLOPT_IPRESOLVE(3)

NAME
       CURLOPT_IPRESOLVE - IP protocol version to use

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_IPRESOLVE, long resolve);

DESCRIPTION
       Allows an application to select what kind of IP addresses to use when
       establishing a connection or choosing one from the connection pool.
       This is interesting when using host names that resolve to more than one
       version of IP.

       If the URL provided for a transfer contains a numerical IP version as a
       host name, this option will not override or prohibit libcurl from using
       that IP version.

       Available values for this option are:

       CURL_IPRESOLVE_WHATEVER
              Default, can use addresses of all IP versions that your system
              allows.

       CURL_IPRESOLVE_V4
              Uses only IPv4 addresses.

       CURL_IPRESOLVE_V6
              Uses only IPv6 addresses.

DEFAULT
       CURL_IPRESOLVE_WHATEVER

PROTOCOLS
       All

EXAMPLE
       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");

         /* of all addresses example.com resolves to, only IPv6 ones are used */
         curl_easy_setopt(curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V6);

         ret = curl_easy_perform(curl);

         curl_easy_cleanup(curl);
       }

AVAILABILITY
       Always

RETURN VALUE
       Returns CURLE_OK

SEE ALSO
       CURLOPT_HTTP_VERSION(3), CURLOPT_SSLVERSION(3),

ibcurl 8.1.2                      May 8, 2023             CURLOPT_IPRESOLVE(3)