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-rw-r--r--railties/lib/rails/configuration.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/railties/lib/rails/configuration.rb b/railties/lib/rails/configuration.rb
index c3e1120fa3..45e2e521ef 100644
--- a/railties/lib/rails/configuration.rb
+++ b/railties/lib/rails/configuration.rb
@@ -19,6 +19,7 @@ module Rails
middleware.use('ActionDispatch::Cookies')
middleware.use(lambda { ActionController::Base.session_store }, lambda { ActionController::Base.session_options })
middleware.use('ActionDispatch::Flash', :if => lambda { ActionController::Base.session_store })
+ middleware.use(lambda { Rails::Rack::Metal.new(Rails.application.config.paths.app.metals.to_a, Rails.application.config.metals) })
middleware.use('ActionDispatch::ParamsParser')
middleware.use('::Rack::MethodOverride')
middleware.use('::ActionDispatch::Head')