On Wed, 18 Nov 2020, James Read via curl-library wrote:
are there any undocumented calls such that I can inspect the DNS cache to
ensure things are working as expected?
Not publicly exported ones, no. libcurl has no undocumented API calls.
libcurl logs "Hostname %s was found in DNS cache" in the verbose output if a
host name was found in the DNS cache (and used).
--
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