Compressed entities are not being cached properly
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                 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


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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