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CURLOPT_IPRESOLVE(3)	   Library Functions Manual	  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 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, (long)CURL_IPRESOLVE_V6);

	   res = curl_easy_perform(curl);

	   curl_easy_cleanup(curl);
	 }
       }

AVAILABILITY
       Added in	curl 7.10.8

RETURN VALUE
       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK	(0) means everything was OK, non-zero means an error occurred,
       see libcurl-errors(3).

SEE ALSO
       CURLOPT_HTTP_VERSION(3),	CURLOPT_RESOLVE(3), CURLOPT_SSLVERSION(3)

libcurl				  2025-06-03		  CURLOPT_IPRESOLVE(3)

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