.\" generated by cd2nroff 0.1 from CURLOPT_IPRESOLVE.md .TH CURLOPT_IPRESOLVE 3 "2024-12-11" libcurl .SH NAME CURLOPT_IPRESOLVE \- IP protocol version to use .SH SYNOPSIS .nf #include CURLcode curl_easy_setopt(CURL *handle, CURLOPT_IPRESOLVE, long resolve); .fi .SH 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: .IP CURL_IPRESOLVE_WHATEVER Default, can use addresses of all IP versions that your system allows. .IP CURL_IPRESOLVE_V4 Uses only IPv4 addresses. .IP CURL_IPRESOLVE_V6 Uses only IPv6 addresses. .SH DEFAULT CURL_IPRESOLVE_WHATEVER .SH PROTOCOLS This functionality affects all supported protocols .SH EXAMPLE .nf 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); } } .fi .SH AVAILABILITY Added in curl 7.10.8 .SH RETURN VALUE Returns CURLE_OK .SH SEE ALSO .BR CURLOPT_HTTP_VERSION (3), .BR CURLOPT_RESOLVE (3), .BR CURLOPT_SSLVERSION (3)