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Canvas app not returning Signed_request while initializing the app

I am checking on the Canvas functionality for integratin external apps. However , on loading the initial page of the application, I observed that no headers /property like signed_request is found within the response of the pages. I have checked all possible responses via Fiddler to try identifying the signed_request. It however was not found. Anything that I am missing ? Or anything that needs to be done additionally to find the signed_request in the responses ?