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plugin/forward: cap default connect attempts (#8365)

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Default to two connect attempts per configured upstream so fast failures cannot spin until the request deadline. Track whether max_connect_attempts was explicitly configured so zero still opts into the legacy unbounded behavior.

Fixes #7723

Signed-off-by: houyuwushang <liuluoqianqiu@outlook.com>
This commit is contained in:
houyuwushang
2026-08-04 09:49:29 +08:00
committed by GitHub
parent dc1e3a96ad
commit 0fa6c66797
5 changed files with 98 additions and 17 deletions
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plugin/forward/README.md
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@@ -75,8 +75,9 @@ forward FROM TO... {
an upstream to be down. If 0, the upstream will never be marked as down (nor health checked).
Default is 2.
* `max_connect_attempts` caps the total number of upstream connect attempts
performed for a single incoming DNS request. Default value of 0 means no per-request
cap.
performed for a single incoming DNS request. The default cap is twice the number of
configured upstreams, allowing two complete passes when all upstreams are healthy.
Set this to 0 to disable the per-request cap.
* `expire` **DURATION**, expire (cached) connections after this time, the default is 10s.
* `doh_method` **GET|POST**, whether to use GET or POST http method for DoH requests (defaults to POST).
* `max_idle_conns` **INTEGER**, maximum number of idle connections to cache per upstream for reuse.