Override Rack::Request to use the same trusted proxy settings as Rails

config/initializers/trusted_proxies.rb

@@ -0,0 +1,7 @@
+module Rack
+  class Request
+    def trusted_proxy?(ip)
+      Rails.application.config.action_dispatch.trusted_proxies.any? { |proxy| proxy === ip }
+    end
+  end
+end