class ActionDispatch::MiddlewareStack

in the guides.
stack}[guides.rubyonrails.org/rails_on_rack.html#action-dispatcher-middleware-stack]
Read more about {Rails middleware
= Action Dispatch MiddlewareStack

def [](i)

def [](i)
  middlewares[i]
end

def assert_index(index, where)

def assert_index(index, where)
  i = index.is_a?(Integer) ? index : index_of(index)
  raise "No such middleware to insert #{where}: #{index.inspect}" unless i
  i
end

def build(app = nil, &block)

def build(app = nil, &block)
  instrumenting = ActiveSupport::Notifications.notifier.listening?(InstrumentationProxy::EVENT_NAME)
  middlewares.freeze.reverse.inject(app || block) do |a, e|
    if instrumenting
      e.build_instrumented(a)
    else
      e.build(a)
    end
  end
end

def build_middleware(klass, args, block)

def build_middleware(klass, args, block)
  Middleware.new(klass, args, block)
end

def delete(target)

returns nil if the target is not found.
Returns the array of middlewares not including the deleted item, or

Deletes a middleware from the middleware stack.

def delete(target)
  middlewares.reject! { |m| m.name == target.name }
end

def delete!(target)

raises +RuntimeError+ if the target is not found.
Returns the array of middlewares not including the deleted item, or

Deletes a middleware from the middleware stack.

def delete!(target)
  delete(target) || (raise "No such middleware to remove: #{target.inspect}")
end

def each(&block)

def each(&block)
  @middlewares.each(&block)
end

def index_of(klass)

def index_of(klass)
  middlewares.index do |m|
    m.name == klass.name
  end
end

def initialize(*args)

def initialize(*args)
  @middlewares = []
  yield(self) if block_given?
end

def initialize_copy(other)

def initialize_copy(other)
  self.middlewares = other.middlewares.dup
end

def insert(index, klass, *args, &block)

def insert(index, klass, *args, &block)
  index = assert_index(index, :before)
  middlewares.insert(index, build_middleware(klass, args, block))
end

def insert_after(index, *args, &block)

def insert_after(index, *args, &block)
  index = assert_index(index, :after)
  insert(index + 1, *args, &block)
end

def last

def last
  middlewares.last
end

def move(target, source)

def move(target, source)
  source_index = assert_index(source, :before)
  source_middleware = middlewares.delete_at(source_index)
  target_index = assert_index(target, :before)
  middlewares.insert(target_index, source_middleware)
end

def move_after(target, source)

def move_after(target, source)
  source_index = assert_index(source, :after)
  source_middleware = middlewares.delete_at(source_index)
  target_index = assert_index(target, :after)
  middlewares.insert(target_index + 1, source_middleware)
end

def size

def size
  middlewares.size
end

def swap(target, *args, &block)

def swap(target, *args, &block)
  index = assert_index(target, :before)
  insert(index, *args, &block)
  middlewares.delete_at(index + 1)
end

def unshift(klass, *args, &block)

def unshift(klass, *args, &block)
  middlewares.unshift(build_middleware(klass, args, block))
end

def use(klass, *args, &block)

def use(klass, *args, &block)
  middlewares.push(build_middleware(klass, args, block))
end

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