CURLOPT_IPRESOLVE(3) curl_easy_setopt options 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 addresses using
more than one version of IP. The allowed values 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),
libcurl 7.81.0 November 26, 2021 CURLOPT_IPRESOLVE(3)
Generated by dwww version 1.14 on Fri Jul 18 03:02:33 CEST 2025.