How to set cookies between Heroku domains?

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    The Public Suffix List

  • Browsers us a thing called Public Suffix List (https://publicsuffix.org) to limit what domains a cookie can be assigned to in order to prevent just what you are trying to do. As it happens, herokuapp.com is on that list, so you won’t be able to set any cookies for the shared domain, only the individual subdomains.

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