Minor Description
The cache key is generated by class org.apache.http.impl.client.cache.CacheKeyGenerator based on the host and uri but currently the host used is the physical target server taken from given by route.getTargetHost()
As a result when using 1 target server with several virtual hosts the cache entries from the different virtual hosts are mixed.
The cache key should be generated using the virtual host given by org.apache.http.protocol.HttpCoreContext.getTargetHost()