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Send additional paramaters with signed request for canvas app

I created a connected app with canvas app signed request enabled. This canvas app is used in multiple visualforce pages. I have a nodeapp which receives the signed request. Now I want to identify which visualforce page the signed request came. How would I do that? 
AnudeepAnudeep (Salesforce Developers) 
Hi Sumit, 

I recommend looking at the browser console log to see if you can locate canvas app URL/signed request. Usually a canvas app URL contains the name of the VF Page. See this example

There are ways to decode a signed request. However, I don't think it displays the VF page origin