/public/ files missing content type header

I’m running Meteor 1.3.x and noticed that files served out of /public/ are missing a content-type header. I could use the WebApp.rawConnectHandlers to set the header, but then it would be the same for all files regardless of their actual content type.

For example, public/foo.js should have a different content type than public/bar.jpg.

Anyone know if it is possible to set the correct value automatically or through some code logic?