lukenowak opened a new issue #7425:
URL: https://github.com/apache/trafficserver/issues/7425
Having configuration:
```
CONFIG proxy.config.http.negative_revalidating_enabled INT 1
CONFIG proxy.config.http.negative_revalidating_lifetime INT 10
```
I have such scenario:
* with executing `GET /test HTTP/1.1` backend replies `HTTP/1.1 200 OK`
with header: `Cache-Control: max-age=11, public` and some content, I see
`TCP_MISS/200` in `squid.log`, I am happy with the reply
* then I configured backend to reply `HTTP/1.1 503 Service Unavailable`
with `cache-control: no-cache`
* did again `GET /test HTTP/1.1`, got proper 200 reply from cache, in
`squid.log` I see `TCP_REFRESH_MISS/200`
* `sleep 15` (more then `negative_revalidating_lifetime`)
* did again `GET /test HTTP/1.1`, got:
* surprising 200 reply
* expected: 503 code from the backend
* in `squid.log` I see `TCP_REFRESH_MISS/200`
It happens with 7.1.11, 8.1.0 and 8.1.1.
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