Incorrect mime-types (content-type header) for mp4 and js

[nat (Natalie T)]

@Canapin

When loading the video URL, headers are different between a regular install and a dev install.

On the regular production install, the video content type is set to application/mp4, whereas it’s set to video/mp4 on a dev install.

Oh good find - this is weird.

It looks like MiniMime (a library we use and own) might be returning these values

pry(main)> MiniMime.lookup_by_filename("a.mp4").content_type
=> "application/mp4"

lib/db/ext_mime.db

I’ll create a PR and we’ll discuss if it’s an issue changing these.