Custom headers needs documentation

[bschaeffer]

How do custom headers work? I've only ever seen examples in two issues (#232 & #233) that we're never really closed and have basically no discussion so they didn't help

For instance, I'm using Rackspace and would like to set some Access-Control-* headers on my font assets, here's my custom_headers configuration:

config.custom_headers = {
  '.*\.(ttf|otf|eot|woff|svg|swf)$' => {
    access_control_allow_origin: '*',
    access_control_max_age: 1728000,
  }
}

.*\.(ttf|otf|eot|woff|svg|swf)$ looks like a pretty good regular expression to me, as all the examples I've seen seem to indicate that string/regex keys seem to be allowed.

But none of my font files are being uploaded, even after a rake assets:clean assets:clobber call.

[bschaeffer]

Okay, so my example was bad. Needed double quotes " instead of single quotes as a key. Still think there needs to be some documentation on that end.

[embs]

I agree about the need for documentation. I couldn't find, for instance, how to configure custom headers through environment variable (nonetheless documentation proposition that any configuration is possible through env vars).

Is it possible to configure custom headers through environment variable?

[PikachuEXE]

I don't think there is a way to config it through environment variable
Since it's a hash of a hash