curl / libcurl / API / curl_easy_setopt / CURLOPT_IPRESOLVE

CURLOPT_IPRESOLVE explained

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),

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