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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¶
All
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, CURL_IPRESOLVE_V6);
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
} }
AVAILABILITY¶
Always
RETURN VALUE¶
Returns CURLE_OK
SEE ALSO¶
CURLOPT_HTTP_VERSION(3), CURLOPT_RESOLVE(3), CURLOPT_SSLVERSION(3)
2024-06-09 | libcurl |