How to persist cookies across domain aliases with shared underlying Cloudfront distribution?

Question

I have 2 hosted zones (one.com + www.one.com, and two.com + www.two.com) pointing to the same Cloudfront distribution blablablabla.cloudfront.net. The frontend lives in an S3 bucket.

Is there any way for these 4 domain aliases to share cookies, e.g. by setting them on the underlying Cloudfront domain blablablabla.cloudfront.net instead of one.com, www.one.com, two.com, or www.two.com?

I currently have the following aliases in the first hosted zone (and similar for the second), in addition to NS, SOA, and CNAME records:

one.com	  A   Simple   -   Yes   blablablabla.cloudfront.net.   -   -   No   -

www.one.com   A   Simple   -   Yes   one.com.   -   -   Yes   -

Evan Lecklider · Answer

This isn't possible due to the way that browsers work with regards to cookies. Take a look at the MDN documentation on the Set-Cookie header, especially the section on domain handling.

Though the CloudFront domain technically serves both aliases, the browser never sees that domain, only the aliases.

How to persist cookies across domain aliases with shared underlying Cloudfront distribution?

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