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https://issues.apache.org/jira/browse/HTTPCLIENT-1164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13221660#comment-13221660
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Jon Moore commented on HTTPCLIENT-1164:
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Here's another thought: perhaps the DecompressingEntity should remove the
Content-Length header if it exists? It already returns -1 for
getContentLength() as it accurately indicates the length of decompressed body
is unknown. I think if we did this, then you could successfully plug a
ContentEncodingHttpClient as the backend for the CachingHttpClient. Since it
would appear that the DecompressingEntity is modifying the response to keep it
semantically unchanged (e.g. by removing Content-Encoding as well), this might
actually be what we want.
> Compressed entities are not being cached properly
> -------------------------------------------------
>
> Key: HTTPCLIENT-1164
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1164
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: Cache
> Affects Versions: Snapshot
> Reporter: Manish Tripathi
> Assignee: Jon Moore
>
> org.apache.http.impl.client.cache.CacheValidityPolicy.contentLengthHeaderMatchesActualLength()
> returns false for entities decompressed by ContentEncodingHttpClient,
> because the length of decompressed entity stored in cache will be different
> from the length specified in the response header.
> Consequently, gzipped/deflated entities will never be satisfied from the
> cache.
> Proposed fix: introduce new field in HttpCacheEntry() - actualContentLength,
> and populate it with the actual content length rigth before the cache entry
> is stored in the cache. Change the
> org.apache.http.impl.client.cache.CacheValidityPolicy.contentLengthHeaderMatchesActualLength()
> method to compare
> entry.getResource().length() with entry.getActualContentLength()
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