routes - Rails Routing - Reject any/all extensions? -

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i want make request /session/update , return json response. have working right following route:

get 'session/update', to: 'user_sessions#keep_alive'

however, route allows requests have type of extension tacked on end of (/session/update.txt, /session/update.abc123, etc.). how can write route rejects request includes extension? want lock down responds /session/update.

you can constraints below

scope :format => true, :constraints => { :format => 'json' }   'session/update', to: 'user_sessions#keep_alive' end

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