config/initializers/policy_headers.rb

   1 module OpenStreetMap
   2   module Rack
   3     class PolicyHeaders
   4       COOP_HEADER = "Cross-Origin-Opener-Policy".freeze
   5
   6       def initialize(app)
   7         @app = app
   8       end
   9
  10       def call(env)
  11         status, headers, response = @app.call(env)
  12         headers[COOP_HEADER] = "same-origin" unless headers.key?(COOP_HEADER)
  13         [status, headers, response]
  14       end
  15     end
  16   end
  17 end
  18
  19 Rails.configuration.middleware.use OpenStreetMap::Rack::PolicyHeaders