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CURLOPT_DNS_SHUFFLE_ADDRESSES(3) libcurl CURLOPT_DNS_SHUFFLE_ADDRESSES(3)
CURLOPT_DNS_SHUFFLE_ADDRESSES - shuffle IP addresses for hostname
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_SHUFFLE_ADDRESSES, long onoff);
When a name is resolved and more than one IP address is returned,
shuffle the order of all returned addresses so that they will be used
in a random order. This is similar to the ordering behavior of
gethostbyname which is no longer used on most platforms.
Addresses will not be reshuffled if a name resolution is completed
using the DNS cache. CURLOPT_DNS_CACHE_TIMEOUT(3) 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 will be reordered randomly, their order
will not be in accordance with RFC 3484 or any other deterministic
order that may be generated by the system's name resolution
implementation. This may have performance impacts and may cause IPv4 to
be used before IPv6 or vice versa.
CURL *curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
curl_easy_setopt(curl, CURLOPT_DNS_SHUFFLE_ADDRESSES, 1L);
/* always cleanup */
Added in 7.60.0
CURLE_OK or an error such as CURLE_UNKNOWN_OPTION.
ibcurl 8.1.2 April 26, 2023