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module ActionController
# When you're using the flash, it's generally used as a conditional on the view.
# This means the content of the view depends on the flash. Which in turn means
# that the ETag for a response should be computed with the content of the flash
# in mind. This does that by including the content of the flash as a component
# in the ETag that's generated for a response.
module EtagWithFlash
extend ActiveSupport::Concern
include ActionController::ConditionalGet
included do
etag { flash unless flash.empty? }
end
end
end
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