Manual Reference Pages - CURLOPT_DNS_CACHE_TIMEOUT (3)
CURLOPT_DNS_CACHE_TIMEOUT - set life-time for DNS cache entries
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_CACHE_TIMEOUT, long age);
Pass a long, this sets the timeout in seconds. Name resolves will be kept in
memory and used for this number of seconds. Set to zero to completely disable
caching, or set to -1 to make the cached entries remain forever. By default,
libcurl caches this info for 60 seconds.
The name resolve functions of various libc implementations dont re-read name
server information unless explicitly told so (for example, by calling
res_init(3)). This may cause libcurl to keep using the older server even
if DHCP has updated the server info, and this may look like a DNS cache issue
to the casual libcurl-app user.
Note that DNS entries have a "TTL" property but libcurl doesnt use that. This
DNS cache timeout is entirely speculative that a name will resolve to the same
address for a certain small amount of time into the future.
|libcurl 7.37.0 ||CURLOPT_DNS_CACHE_TIMEOUT (3) ||17 Jun 2014 |
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