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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 es- tablishing 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 al- lows. 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 result; 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); result = curl_easy_perform(curl); curl_easy_cleanup(curl); } } HISTORY CURL_IPRESOLVE_* macros became long types in 8.15.0, before this version a long cast was necessary when passed to curl_easy_setopt(3). 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 2026-06-11 CURLOPT_IPRESOLVE(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | HISTORY | AVAILABILITY | RETURN VALUE | SEE ALSO
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