membphis commented on PR #13062:
URL: https://github.com/apache/apisix/pull/13062#issuecomment-4923709488

   P2 follow-up: `resolve_upstream_client_cert()` now calls 
`apisix_secret.fetch_secrets(..., true)` from `handle_upstream`. Cache hits are 
cheap, but a cold/expired cache can still call the secret manager on the 
proxied request path. Please consider moving upstream SSL secret resolution to 
config-change/background refresh, or caching a resolved SSL object by SSL 
resource version, so request handling only reads already-resolved cert/key 
material.


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