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repo/core/curl/files/CURLOPT_IPRESOLVE.3

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.\" generated by cd2nroff 0.1 from CURLOPT_IPRESOLVE.md
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.TH CURLOPT_IPRESOLVE 3 "2024-08-02" libcurl
.SH NAME
CURLOPT_IPRESOLVE \- IP protocol version to use
.SH SYNOPSIS
.nf
#include <curl/curl.h>
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
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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
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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
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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)