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),