Bug: if someone ran server with RAILS_ENV=production, but tried to
access the site under http://, then logging in didn't work. This was
because we set the `secure` flag on cookies when running in the
production environment, because we assumed that in production you were
using HTTPS. If you weren't using HTTPS, then the `secure` flag
prevented session cookies from being sent under http://.
The default now is to use http:// instead of https:// for the
`canonical_url` option.
If you run a Danbooru instance, and you use HTTPS, you will have to
change the `canonical_url` config option to "https://www.mybooru.com".
f78d10a591