How I Can Make The Google Api Spreadsheet Available As A Public Feed ?

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in my spreadsheet URL , i didn't get the "KEY" word in it?
I Know how i can modify my spreadsheet URL to make as public feed ,, but i want to know why i didn't get the "key" parameter in my URL
i got this URL `https://docs.google.com/spreadsheets/d/1JwX7k8Vwqm9zhInLba0UsEn7cg4lTCvzsdRLYL3oRdI/edit#gid=17211736`
but there is no "key" parameter on it !