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Posted to github@trafficserver.apache.org by "masaori335 (via GitHub)" <gi...@apache.org> on 2026/04/08 05:58:58 UTC
[PR] Add connect_down_policy: 4 for empty reply [trafficserver]
masaori335 opened a new pull request, #13069:
URL: https://github.com/apache/trafficserver/pull/13069
# Problem
When an origin server accepts a TCP/TLS connection but closes it without sending any HTTP response, ATS does not mark the origin as down — even after exhausting all retry attempts. This can cause ATS to keep hammering a misbehaving origin on every request.
# Fix
- Add a new policy, `4`, all failures covered by policy 3, plus the case where `server_response_hdr_bytes == 0` at the end of a transaction — i.e. the origin closed or reset the connection after the TCP handshake without sending any HTTP response.
- The `HttpSM::track_connect_fail()` function was also refactored for clarity.
- AuTest uses new `on_connect: refuse|reset` feature (thank you, @bneradt )
## notes
Two cases are explicitly excluded:
- Reused keep-alive connections: there is a known race between ATS reusing a keep-alive connection and the origin closing it, described by @moonchen on #12437. this policy is only applied for the first transaction.
- Multiplexed origins ( HTTP/2 ): per-stream error observation (e.g. RST_STREAM) and does not indicate the underlying connection is unhealthy.
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Re: [PR] Add connect_down_policy: 4 for empty reply [trafficserver]
Posted by "masaori335 (via GitHub)" <gi...@apache.org>.
masaori335 merged PR #13069:
URL: https://github.com/apache/trafficserver/pull/13069
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Re: [PR] Add connect_down_policy: 4 for empty reply [trafficserver]
Posted by "cmcfarlen (via GitHub)" <gi...@apache.org>.
cmcfarlen commented on PR #13069:
URL: https://github.com/apache/trafficserver/pull/13069#issuecomment-4289117680
Cherry-picked to 10.2.x
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