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- .\" generated by cd2nroff 0.1 from CURLOPT_DNS_SHUFFLE_ADDRESSES.md
- .TH CURLOPT_DNS_SHUFFLE_ADDRESSES 3 "2025-01-17" libcurl
- .SH NAME
- CURLOPT_DNS_SHUFFLE_ADDRESSES \- shuffle IP addresses for hostname
- .SH SYNOPSIS
- .nf
- #include <curl/curl.h>
- CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_SHUFFLE_ADDRESSES, long onoff);
- .fi
- .SH DESCRIPTION
- Pass a long set to 1 to enable this option.
- When a name is resolved and more than one IP address is returned, this
- function shuffles the order of all returned addresses so that they are used in
- a random order. This is similar to the ordering behavior of the legacy
- gethostbyname function which is no longer used on most platforms.
- Addresses are not reshuffled if name resolution is completed using the DNS
- cache. \fICURLOPT_DNS_CACHE_TIMEOUT(3)\fP can be used together with this
- option to reduce DNS cache timeout or disable caching entirely if frequent
- reshuffling is needed.
- Since the addresses returned are randomly reordered, the order is not in
- accordance with RFC 3484 or any other deterministic order that may be
- generated by the system\(aqs name resolution implementation. This may have
- performance impacts and may cause IPv4 to be used before IPv6 or vice versa.
- .SH DEFAULT
- 0 (disabled)
- .SH PROTOCOLS
- This functionality affects all supported protocols
- .SH EXAMPLE
- .nf
- int main(void)
- {
- CURL *curl = curl_easy_init();
- if(curl) {
- curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
- curl_easy_setopt(curl, CURLOPT_DNS_SHUFFLE_ADDRESSES, 1L);
- curl_easy_perform(curl);
- /* always cleanup */
- curl_easy_cleanup(curl);
- }
- }
- .fi
- .SH AVAILABILITY
- Added in curl 7.60.0
- .SH RETURN VALUE
- CURLE_OK or an error such as CURLE_UNKNOWN_OPTION.
- .SH SEE ALSO
- .BR CURLOPT_DNS_CACHE_TIMEOUT (3),
- .BR CURLOPT_IPRESOLVE (3)
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