forked from https://github.com/symfony/symfony
e50db1f93f
This PR was squashed before being merged into the 3.4 branch (closes #35305).
Discussion
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[HttpKernel] Fix stale-if-error behavior, add tests
| Q | A
| ------------- | ---
| Branch? | 3.4
| Bug fix? | yes
| New feature? | no
| Deprecations? | no
| Tickets | #24248
| License | MIT
| Doc PR |
This PR adds the first tests for `stale-if-error` logic in `HttpCache`.
It also fixes an observation from #24248: For responses that have been cached as `public` with an `ETag` but without a lifetime, in case of an error the stale response will be served forever (= as long as the error persists), even beyond the configured `stale-if-error` grace period.
Furthermore, it tries to improve compliance with RFC 7234: Stale responses must not be sent (under no condition) if one of
* `no-cache`
* `must-revalidate`
* `proxy-revalidate` or
* `s-maxage` (sic) is present.
This can be found in the corresponding chapters of Section 5.2.2 for these directives, but is also summarized in [Section 4.2.4](https://tools.ietf.org/html/rfc7234#section-4.2.4) as
> A cache MUST NOT generate a stale response if it is prohibited by an explicit in-protocol directive (e.g., by a "no-store" or "no-cache" cache directive, a "must-revalidate" cache-response-directive, or an applicable "s-maxage" or "proxy-revalidate" cache-response-directive; see Section 5.2.2).
Because disabling of `stale-if-error` for `s-maxage` responses probably has a big impact on the usefulness of that feature in practice, it has to be enabled explicitly with a new config setting `strict_smaxage` (defaulting to `false`).
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| CHANGELOG-3.0.md | ||
| CHANGELOG-3.1.md | ||
| CHANGELOG-3.2.md | ||
| CHANGELOG-3.3.md | ||
| CHANGELOG-3.4.md | ||
| CODE_OF_CONDUCT.md | ||
| composer.json | ||
| CONTRIBUTING.md | ||
| CONTRIBUTORS.md | ||
| LICENSE | ||
| link | ||
| phpunit | ||
| phpunit.xml.dist | ||
| README.md | ||
| UPGRADE-3.0.md | ||
| UPGRADE-3.1.md | ||
| UPGRADE-3.2.md | ||
| UPGRADE-3.3.md | ||
| UPGRADE-3.4.md | ||
| UPGRADE-4.0.md | ||
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