serrislew opened a new pull request #8484:
URL: https://github.com/apache/trafficserver/pull/8484
Proxies should serve stale content even if DNS lookup to OS is unsuccessful.
- For hierarchical caching, if a child proxy matches successfully to a
parent proxy and child has requested stale object in its cache, it should not
need to make a DNS request for the origin.
- It can validate with the parent and return the object as expected.
- Without hierarchical caching, if stale content is being requested from a
proxy and the DNS lookup to the OS is unsuccessful, it should also serve the
stale object
- this behavior is similar to when the origin server is down and the
proxy serves stale content with a warning header
These changes still respect the `max_stale_age` configurations and do not
serve stale content pass the expiration date.
Autest tests the following using PUSH command to store stale content in
proxy's cache:
- With child mapping to an origin server without a DNS entry and child
matching successfully to parent, a request from child after content becomes
stale returns `200`
- After `max_stale_age` has passed, request from child returns `500` as
stale content is no longer returnable
- Without hierarchical caching and proxy mapping to an origin server without
a DNS entry, a request from proxy after content becomes stale returns `200`
- After `max_stale_age` has passed, request from proxy returns `500` as
stale content is no longer returnable
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