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hostip: only cache negative resolves for authoritative answers

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Closes #22302
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Graham Campbell 2026-07-12 03:58:18 +01:00 • committed by Daniel Stenberg
parent 353d05ef0c
commit c3ae9ef822
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13 changed files with 253 additions and 22 deletions
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8
docs/libcurl/libcurl-env-dbg.md
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@ -185,7 +185,13 @@ Makes ever threaded resolve experience an initial delay in milliseconds.
## `CURL_DBG_RESOLV_FAIL_DELAY`
With a threaded resolver, delay each lookup by the given milliseconds
and give a negative answer.
and fail it, as if a transient resolver failure happened.
## `CURL_DBG_RESOLV_FAIL_NEGATIVE`
With a threaded resolver, make a lookup failing via
`CURL_DBG_RESOLV_FAIL_DELAY` count as an authoritative negative answer,
eligible for negative DNS caching, instead of a transient failure.
## `CURL_DBG_RESOLV_FAIL_IPV6`

4
docs/libcurl/opts/CURLOPT_DNS_CACHE_TIMEOUT.md
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@ -53,7 +53,9 @@ libcurl prunes entries from the DNS cache if it exceeds 30,000 entries no
matter which timeout value is used. (Added in version 8.1.0)
Since curl 8.16.0, failed name resolves are stored in the DNS cache for half
the set timeout period.
the set timeout period. Since curl 8.22.0, this only happens when the
resolver answered that the name does not exist, not on transient or local
resolver failures.
# DEFAULT