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 hostnames that resolve to more than
       one IP family.

       If the URL provided for a transfer contains a numerical IP version as a host name, this option  does  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

       This functionality affects all supported protocols

EXAMPLE

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           CURLcode res;
           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);

           res = curl_easy_perform(curl);

           curl_easy_cleanup(curl);
         }
       }

AVAILABILITY

       Added in curl 7.10.8

RETURN VALUE

       Returns CURLE_OK

SEE ALSO

       CURLOPT_HTTP_VERSION(3), CURLOPT_RESOLVE(3), CURLOPT_SSLVERSION(3)

libcurl                                            2024-12-11                               CURLOPT_IPRESOLVE(3)