Gzip static assets in Phoenix
This blog post was originally published a little while ago. Please consider that it may no longer be relevant or even accurate.
Recently I've been playing with Phoenix, the hot framework for Elixir. While it has a definite Rails vibe there's also a very different flavour because of the nature of it being written in a functional language. Oddly enough reading Refactoring to Collections, a book written mainly for the PHP community, has eased the transition to functional coding.
Having just deployed my first example app on Heroku I was seeing some pretty good speeds - page loads in under 1s. But not the wow I was expecting from moving to Phoenix. Turns out, there's a quick tweak you can make to your Phoenix application so that your assets are gzipped in production. Simply edit your lib/app/endpoint.ex file.
It's mentioned in the comment above it, but by enabling the gzip option (which is off by default), you'll get a significant performance boost out of your static assets.
On a related note, despite the fact that Phoenix hashes your static assets filenames' so they can be cachebusted, it still adds a ?vsn=n query string to the end of the path. There was an issue and related PR to remove this, or make it optional, but it was rejected. I do hope at some point they'll reconsider this, because having it there is unneccessary, and a little ugly.
