Have rails respond to HTTP OPTIONS method.

options.rb

# Implementation for HTTP OPTIONS method in rails 3.2.13
# inspired by https://gist.github.com/ajturner/832700

# routes.rb
match '/*any_path', :controller => 'application', :action => 'method_for_options_method', :constraints => { :method => 'OPTIONS' }

# application_controller.rb
def method_for_options_method
  render :nothing => true, :status => 200
end