class Async::HTTP::Cache::Store::Memory

def lookup(key, request)
	if response = @index[key]
		if response.expired?
			@index.delete(key)
			
			@pruned += 1
			
			return nil
		end
		
		if etags = request.headers[IF_NONE_MATCH]
			if etags.include?(response.etag)
				return NOT_MODIFIED
			end
		end
		
		@hit += 1
		
		return response.dup
	else
		@miss += 1
		
		return nil
	end
end