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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 50675d19b8..811c3a9fd9 100644
--- a/railties/lib/rails/configuration.rb
+++ b/railties/lib/rails/configuration.rb
@@ -12,6 +12,7 @@ module Rails
middleware.use('::Rack::Runtime')
middleware.use('::Rails::Rack::Logger')
middleware.use('::ActionDispatch::ShowExceptions', lambda { Rails.application.config.consider_all_requests_local })
+ middleware.use('::Rack::Sendfile', lambda { Rails.application.config.action_dispatch.x_sendfile_header })
middleware.use('::ActionDispatch::Callbacks', lambda { !Rails.application.config.cache_classes })
middleware.use('::ActionDispatch::Cookies')
middleware.use(lambda { ActionController::Base.session_store }, lambda { ActionController::Base.session_options })