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https://issues.apache.org/jira/browse/HTTPCLIENT-2354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17910325#comment-17910325
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Skylar Sutton commented on HTTPCLIENT-2354:
-------------------------------------------
RFC 9111 does state exactly that:
+_*"The must-revalidate directive also permits a shared cache to reuse a
response to a request containing an Authorization header field ([Section
11.6.2|https://www.rfc-editor.org/rfc/rfc9110#section-11.6.2] of
[[HTTP|https://www.rfc-editor.org/rfc/rfc9111.html#HTTP]]), subject to the
above requirement on revalidation ([Section
3.5|https://www.rfc-editor.org/rfc/rfc9111.html#caching.authenticated.responses])."*_+
https://www.rfc-editor.org/rfc/rfc9111.html#name-must-revalidate
> ResponseCachingPolicy::isExplicitlyCacheable does not account for
> "must-revalidate"
> -----------------------------------------------------------------------------------
>
> Key: HTTPCLIENT-2354
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2354
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Affects Versions: 5.4.1
> Reporter: Skylar Sutton
> Priority: Major
>
> Using httpclient5-cache:5.4.1, backed by an EH Cache with the following
> config:
> * maxCacheEntries: Integer.MAX
> * maxObjectSize: Integer.MAX
> * sharedCache: false
> * setNeverCacheHTTP10ResponsesWithQueryString: false
> * setNeverCacheHTTP11ResponsesWithQueryString: false
> Execute a call against a resource with a query string (ex: "/foo?q=bar")
> which returns the following CacheControl:
> {code:java}
> Cache-Control: "must-revalidate, max-age=0" {code}
> The Apache Client will fail to cache the resource, specifically because of
> this check in {_}ResponseCachingPolicy::isResponseCachable{_}:
> {code:java}
> if (!this.neverCache1_1ResponsesWithQueryString &&
> !this.isExplicitlyCacheable(cacheControl, response)) {
> LOG.debug("Response is not cacheable as it is missing explicit caching
> headers");
> return false;
> } {code}
> More specifically, _ResponseCachingPolicy::isExplicitlyCachable_ does not
> contain any logic to handle the "must-revalidate" directive.
> Per this documentation, "public" is not required if "must-revalidate" is
> provided:
> [https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control]
> *??"... If a request doesn't have an {{Authorization}} header, or you are
> already using {{s-maxage}} or {{must-revalidate}} in the response, then you
> don't need to use {{{}public ...{}}}"??*
>
>
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