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-rw-r--r--railties/lib/rails/engine.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/railties/lib/rails/engine.rb b/railties/lib/rails/engine.rb
index 457a50e649..a9d98a9d92 100644
--- a/railties/lib/rails/engine.rb
+++ b/railties/lib/rails/engine.rb
@@ -508,7 +508,8 @@ module Rails
def app
@app || @app_build_lock.synchronize {
@app ||= begin
- config.middleware = build_middleware.merge_into(default_middleware_stack)
+ stack = default_middleware_stack
+ config.middleware = build_middleware.merge_into(stack)
config.middleware.build(endpoint)
end
}