HTTPCLIENT-1198: HttpHost is not set in HttpContext in CachingHttpClient. This patch (with tests) primarily just needs to figure out how to set appropriate context variables in the event of a pure cache hit--in the event of a cache miss or a cache validation, we actually make an origin request, and the "backend" client sets these context variables.
httpcomponents/httpclient/trunk/httpclient-cache/src/main/java/org/apache/http/impl/client/cache/CachingHttpClient.java