CURLOPT_IPRESOLVE − IP protocol version to use
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_IPRESOLVE, long resolve);
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 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.
CURL_IPRESOLVE_WHATEVER
All
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);
}
}
Always
Returns CURLE_OK
CURLOPT_HTTP_VERSION(3), CURLOPT_RESOLVE(3), CURLOPT_SSLVERSION(3)