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CURLOPT_IPRESOLVE(3) curl_easy_setopt options CURLOPT_IPRESOLVE(3)

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 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.

CURL_IPRESOLVE_WHATEVER

All

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);
}

Always

Returns CURLE_OK

CURLOPT_HTTP_VERSION(3), CURLOPT_SSLVERSION(3),
November 26, 2021 libcurl 7.83.1

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