Most modern web stacks allow the "filtering" of requests via stackable/composable middleware, allowing you to cleanly separate cross-cutting concerns from your web application. This weekend I needed to hook into go's http.FileServer and was pleasantly surprised how easy it was to do.

This week, @bradfitz (of memcached fame) released groupcache at OSCON 2013. I'm already a big fan of memcached and camlistore, so I couldn't wait to download it and kick the tires.