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https://issues.apache.org/jira/browse/HTTPCLIENT-1099?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bart Robeyns updated HTTPCLIENT-1099:
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Attachment: OpenPolicies.patch
This patch allows to set the Policies on CacheConfig and makes the
Policy-classes public.
> Overriding Caching Policies
> ---------------------------
>
> Key: HTTPCLIENT-1099
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1099
> Project: HttpComponents HttpClient
> Issue Type: Improvement
> Components: Cache
> Affects Versions: 4.1.1
> Reporter: Bart Robeyns
> Priority: Minor
> Labels: cache, policy
> Attachments: OpenPolicies.patch
>
>
> It is not possible to alter the behaviour of the CachingHttpClient because
> the policies defining the behaviour are private and tied directly to specific
> implementations in the CachingHttpClients constructor. Furthermore, these
> policies are package private, discouraging reuse and/or extensions.
> Making this possible is easy enough (provide some policy-setters or
> -constructor-args in CachingHttpClient and make the policy-classes public) -
> which leads me to believe that the tight relationships between client and
> policies is deliberate. Is this the case, or are you willing to accept a
> patch that opens up these classes for extending the caching behaviour?
> The specific case that lead to this question:
> A back-end application only sets its Content-Length header for responses
> below 8K. This response does get stored in the cache, but when retrieving it
> from the cache, CacheValidityPolicy.contentLengthHeaderMatchesActualLength
> checks the Content-Length header with the stored size (to verify whether the
> cached content is complete). This check fails, causing the cache entry to be
> deemed unusable. If we were able to provide our own subclassed
> CacheValidityPolicy, it would be easy to skip the check if the header is
> missing and thus accomodate this specific back-end quirk.
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