Can I Set a Cookie from My Vercel Project Subdomain to

In general, if you use the Set-Cookie header in your subdomain with name=cookievalue;, the cookie will be applied to the apex domain If you do this at the level of your Vercel Project subdomain such as, will the cookie be applied to

The Public Suffix List is under the public suffix list for security purposes and as described in Wikipedia, one of it’s uses is to avoid supercookies. These are cookies with an origin set at the top-level or apex domain such as If an attacker in control of a Vercel project subdomain website sets up a supercookie, it can disrupt any site at the level of or below such as

Therefore, for your own security, it is not possible to set a cookie at the level of from your project subdomain.

Couldn't find the guide you need?