Only respond to OPTIONS for certain paths?

[abevoelker]

I'm trying to add CORS to a Rails app just for a specific path, /foo. With the following rack-cors config:

config.middleware.insert_before 0, Rack::Cors do
  allow do
    origins "example.com"
    resource "/foo", headers: :any, methods: [:get, :options]
  end
end

My application now seems to be responding with 200 OK to OPTIONS requests for arbitrary paths, such as /bar:

Granted it's not responding with any valid CORS response headers, but I'm wondering if this is intended or if I'm doing something wrong. In trying to pare this down, it seems even an empty config displays this behavior:

config.middleware.insert_before 0, Rack::Cors do
end

Is there any way to strictly only respond to requests for /foo? Just getting started and trying to wrap my head around the gem.