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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