In one of our modules we make use of unirest client library for Java in order to access remote REST endpoints. As, right now, this involves quite some communication, we were looking into response caching which seems both an obvious idea and yet something that is defined pretty well in HTTP and, too, implemented pretty well in apache httpclient which lives at the core of unirest. And actually, even though undocumented in unirest, getting this done has proven to be mostly straightforward. Yet I decided to do a quick write-up, maybe it will help others get started faster.